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Two-Photon Polymerization Lithography for Optics and Photonics: Fundamentals, Materials, Technologies, and Applications

ADVANCED FUNCTIONAL MATERIALS (2023)

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Article Polymer Science

Synthesis and evaluation of novel aromatic acrylic monomers for optically clear adhesive with high refractive index

Roghayeh Khaleghi Qusheh Bolagh et al.

Summary: In this study, two types of aromatic monomers with high refractive index (RI) were developed and combined with a newly synthesized oligomer to develop a UV-curing adhesive. The results showed that the composition containing the oligomer had improved thermal stability and high glass transition temperature. The adhesion strength was also positively affected, and the refractive index value was suitable for most applications in optoelectronics.

JOURNAL OF APPLIED POLYMER SCIENCE (2023)

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Article Chemistry, Physical

Three-Dimensional Nanolithography with Visible Continuous Wave Laser through Triplet Up-Conversion

Zhijun Luo et al.

Summary: A direct laser writing method based on triplet up-conversion is proposed in this study, which offers low-cost, high-precision, multidimensional, and rapid processing characteristics for low-intensity fabrication of micronanostructures. The feasibility of this method is verified through dynamic modeling and experiments, achieving a minimum line width of micronanostructures (approximately 50 nm) at a laser intensity of 2.5 x 105 W/cm2 and a processing speed of 150 μm/s. Therefore, the direct laser writing method based on triplet up-conversion provides a new approach for low-intensity and high-precision micronanostructure fabrication.

JOURNAL OF PHYSICAL CHEMISTRY LETTERS (2023)

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Article Chemistry, Multidisciplinary

Low-Divergence hBN Single-Photon Source with a 3D-Printed Low- Fluorescence Elliptical Polymer Microlens

Johann A. Preuss et al.

Summary: The article presents a method using ultralow fluorescence photopolymer to 3D print micrometer-sized elliptical lenses on hBN nanocrystals for efficiently collecting light from single-photon emitters. The method is experimentally confirmed to successfully collect single photons without disturbing their characteristics. This approach is highly significant for the application of photonic quantum technologies.

NANO LETTERS (2023)

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Article Optics

Experimental observation of Berry phases in optical Mobius-strip microcavities

Jiawei Wang et al.

Summary: The Mobius strip offers a platform for investigating the topological behavior of spinning particles, such as electrons, polaritons, and photons. Despite theoretical investigations, the optical Berry phase in a Mobius-strip cavity has not been experimentally observed until now. In this study, the researchers successfully observed the Berry phase generated in optical Mobius-strip microcavities by generating elliptical polarization of the resonating light.

NATURE PHOTONICS (2023)

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Article Optics

Double-sided femtosecond 3D printing technology based on a specific mask

Mingyue Tan et al.

Summary: This paper proposes a double-sided femtosecond three-dimensional printing technology that can manufacture micro/nanostructures on both sides of the substrate. The technology achieves accurate double-sided manufacturing with minimal height and alignment errors, and has been successfully applied to fabricate a double-sided micro-optics system. The imaging quality of the system is maintained, indicating the reliability and effectiveness of the proposed technique.

OPTICS AND LASERS IN ENGINEERING (2023)

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Article Optics

Improved two-photon polymerization through an optical fiber using coherent beam shaping

Georgia Konstantinou et al.

Summary: This study introduces an advanced digital scanning technique based on transmission matrix approach, for high-resolution three-dimensional light-based additive manufacturing. Compared to previous techniques, this method is faster, simpler, and provides smaller printing distances and smoother printed structures.

OPTICS AND LASERS IN ENGINEERING (2023)

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Article Optics

Adjustment-free two-sided 3D direct laser writing for aligned micro-optics on both substrate sides

Michael Schmid et al.

Summary: 3D direct laser writing is a powerful technique for creating complex micro-optics. It offers two different writing modes: immersion mode, where an immersion medium is used between the objective and substrate, and dip-in mode, where the objective is in direct contact with the photoresist. In this Letter, the combination of dip-in and photoresist immersion printing is demonstrated by using the photoresist as the immersion medium, allowing the fabrication of doublet objectives on both sides of a substrate with high precision.

OPTICS LETTERS (2023)

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Review Materials Science, Multidisciplinary

Micro-Optics 3D Printed via Multi-Photon Laser Lithography

Diana Gonzalez-Hernandez et al.

Summary: The field of 3D micro-optics is rapidly expanding, with key advances in femtosecond laser direct-write 3D multi-photon lithography. Micro-optics fabricated via this technique have shown impressive potential in beam shaping, advanced imaging, optical sensing, and integrated photonic circuits, attracting increasing industrial interest.

ADVANCED OPTICAL MATERIALS (2023)

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Article Nanoscience & Nanotechnology

Challenges and Opportunities in 3D Laser Printing Based on (1+1)-Photon Absorption

Vincent Hahn et al.

Summary: Most light-based 3D printing methods rely on optical or chemical nonlinearities for polymerization reactions. Two-photon absorption is commonly used in 3D micro-and nanoprinting, but this article reviews three emerging processes that allow for quadratic nonlinearity without relying on two-photon absorption, namely upconversion luminescence, two-step absorption, and triplet-triplet annihilation. These (1 + 1)-photon absorption processes enable the use of continuous-wave lasers at lower peak powers and cost compared to two-photon absorption. The article discusses recent progress, challenges, and future perspectives.

ACS PHOTONICS (2023)

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Article Nanoscience & Nanotechnology

3D nanopolymerization and damage threshold dependence on laser wavelength and pulse duration

Danielius Samsonas et al.

Summary: The dependence of polymerization and optical damage thresholds in multi-photon polymerization lithography were studied using a laser system with group delay dispersion control. The non-linearity order and light-matter interaction mechanisms were investigated for different prepolymers. Polymerization was observed at all wavelengths and pulse durations, with minimal differences in achieved spatial dimension. The dynamics of voxel growth revealed a change in power dependence and significant variation in the dynamic fabrication window.

NANOPHOTONICS (2023)

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Review Chemistry, Multidisciplinary

Two-Photon Polymerization: Fundamentals, Materials, and Chemical Modification Strategies

Sean O'Halloran et al.

Summary: Two-photon polymerization (TPP) is a leading method for microscale fabrication of customized polymeric devices and surfaces. It has a wide range of applications in optics, drug delivery, tissue engineering, and microfluidics. TPP has evolved from standard acrylate- and epoxy-based photoresists to custom formulated monomers that can modify the properties of resulting structures. This article provides an overview of the essential principles and advanced chemical modification strategies for TPP materials and introduces commonly used photoresists and their applications.

ADVANCED SCIENCE (2023)

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Article Chemistry, Multidisciplinary

Humidity-Responsive RGB-Pixels via Swelling of 3D Nanoimprinted Polyvinyl Alcohol

Byoungsu Ko et al.

Summary: This study investigates humidity-responsive nano pixels with a 700 nm resolution, demonstrating full standard RGB gamut coverage and a millisecond-response time. The color pixels are designed as Fabry-Perot etalons and consist of an aluminum mirror substrate, humidity-responsive polyvinyl alcohol spacer, and a top layer of disordered silver nanoparticles. The experiment shows that the volume change of the polyvinyl alcohol reaches up to 62.5% when the relative humidity is manipulated from 20 to 90%. The disordered silver nanoparticle layer enhances the speed of absorption and swelling to the millisecond level.

ADVANCED SCIENCE (2023)

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Article Chemistry, Multidisciplinary

Simultaneous synthesis and integration of nanoscale silicon by three-photon laser direct writing

Kai Li et al.

Summary: We present a single-step synthesis and integration strategy for nanoscale silicon quantum dot architectures using a femtosecond laser direct writing technique. This approach enables the rapid synthesis and integration of silicon architectures with a unique crystal structure, resulting in bright luminescence at 712 nm. Our strategy has great potential for fabricating active layers of integrated circuit components or other compact devices based on silicon quantum dots.

NANOSCALE ADVANCES (2023)

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Article Nanoscience & Nanotechnology

Concurrent Optimization of Diffraction Fields from Binary Phase Mask for Three-Dimensional Nanopatterning

Chihun Lee et al.

Summary: Obtaining a high resolution of a three-dimensional nanostructure is crucial in nanoengineering. This study proposes a concurrent optimization method, using particle swarm optimization, to calculate the optimum phase mask for high-contrast 3D nanopatterning. By inversely designing the desired electric-field intensity map and calculating the required phase mask, this method allows for selective intensity control and fabrication of nanostructures applicable to various fields.

ACS PHOTONICS (2023)

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Article Chemistry, Multidisciplinary

Robust Helical Dichroism on Microadditively Manufactured Copper Helices via Photonic Orbital Angular Momentum

Nianwei Dai et al.

Summary: Artificial chiral micronanostructures with strong chiroptical signals are significant for next generation photonic devices and chiroptical spectroscopy techniques. However, most of the existing chiral metallic metamaterials generate chiroptical signals dependent on photonic spin angular momentum, while those dependent on photonic orbital angular momentum remain unseen. In this work, copper microhelices with opposite handedness are fabricated using additive manufacturing and their orbital angular momentum-dominated chiroptical response is examined. They exhibit helical dichroism and hold promise in advanced chiroptical spectroscopy and photonic OAM engineering.

ACS NANO (2023)

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Article Materials Science, Multidisciplinary

Utilizing the Sensitization Effect for Direct Laser Writing in a Novel Photoresist Based on the Chitin Monomer N-acetyl-D-glucosamine

Dominic T. Meiers et al.

Summary: The great flexibility of direct laser writing (DLW) comes from the ability to fabricate precise 3D structures in small scales and the wide range of applicable materials. This study reports a new bio-sourced resist using chitin as the monomeric unit, paving the way for non-hydrogel resists. It is also shown that using two photoinitiators is more advantageous than using a single one, where the first one acts as a sensitizer and transfers energy to the second one for initiating polymerization.

ADVANCED ENGINEERING MATERIALS (2023)

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Article Chemistry, Multidisciplinary

3D Printing of Resilin in Water by Multiphoton Absorption Polymerization

Doron Kam et al.

Summary: Resilin is a protein found in insects that has exceptional elasticity and fatigue resistance, making it suitable for biological functions such as flight and jumping. By utilizing a Multiphoton Absorption Polymerization 3D printing process, objects made entirely of recombinant resilin protein can be printed at a submicron scale. The printed objects have similar mechanical properties to native resilin and better mechanical properties compared to common hydrogels and poly(dimethylsiloxane), enabling potential applications in biomimicking and creating functional objects.

ADVANCED FUNCTIONAL MATERIALS (2023)

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Review Chemistry, Multidisciplinary

3D Laser Nanoprinting of Functional Materials

Shao-Feng Liu et al.

Summary: 3D laser nanoprinting revolutionizes manufacturing by allowing maskless fabrication of 3D nanostructures at a resolution beyond the optical diffraction limit. It offers printed structures with unique physical, chemical, or mechanical properties not seen at the macro scale. However, its reliance on photopolymerization limits its usability to certain materials and functionalities. The ability to print diverse functional materials and the development of laser nanoprinting techniques beyond photopolymerization open up exciting new applications in nanophotonics and microelectronics.

ADVANCED FUNCTIONAL MATERIALS (2023)

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Article Chemistry, Multidisciplinary

Femtosecond Laser 4D Printing of Light-Driven Intelligent Micromachines

Chunsan Deng et al.

Summary: This study proposes a single-material and one-step 4D printing strategy for the nanomanufacturing of agile and low-threshold light-driven 3D micromachines with programmable shape-morphing characteristics. The carbon nanotube-doped composite hydrogel enhances the light sensitivity and response speed of micromachines. The structural design and assembly of asymmetric microscale mechanical metamaterial unit cells enable the additive nanomanufacturing of 3D shape-morphable micromachines with large dynamic modulation and spatiotemporal controllability.

ADVANCED FUNCTIONAL MATERIALS (2023)

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Article Chemistry, Multidisciplinary

Search for Alternative Two-Step-Absorption Photoinitiators for 3D Laser Nanoprinting

N. Maximilian Bojanowski et al.

Summary: Recent studies have introduced a new generation of photoinitiators for 3D laser nanoprinting, replacing two-photon absorption with two-step absorption. This can now be achieved using inexpensive blue laser diodes instead of expensive femtosecond laser systems. Additionally, researchers are exploring alternative photoinitiators that can be excited by one-color two-step absorption and be de-excited by a different laser color.

ADVANCED FUNCTIONAL MATERIALS (2023)

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Article Chemistry, Multidisciplinary

Printing on Particles: Combining Two-Photon Nanolithography and Capillary Assembly to Fabricate Multimaterial Microstructures

Steven van Kesteren et al.

Summary: A new method of producing multimaterial microstructures has been developed by combining capillarity-assisted particle assembly (CAPA) with two-photon polymerization direct laser writing (2PP-DLW). This method allows for the creation of well-defined structures using functional microparticle arrays produced by CAPA, and automated particle recognition algorithms for connectivity. The flexibility of this method enables the realization of new systems and devices for various fields.

ADVANCED MATERIALS (2023)

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Article Chemistry, Physical

Mechanically robust pyrolyzed carbon produced by two photon polymerization

Peter Serles et al.

Summary: Rapid production of nanoscale carbon-based designs with complex 3D geometry has been enabled by the combination of nano-3D printing via two-photon polymerization and post-pyrolysis. This article evaluates the mechanical performance of pyrolyzed carbon designed with modified printing parameters and provides structural insight towards creating a reliable and robust carbon material.

CARBON (2023)

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Article Chemistry, Multidisciplinary

Rapid Fabrication of 3D Chiral Microstructures by Single Exposure of Interfered Femtosecond Vortex Beams and Capillary-Force-Assisted Self-Assembly

Deng Pan et al.

Summary: A hybrid strategy combining spatial-light-modulator-assisted two-photon polymerization (SATPP) and capillary-force-assisted self-assembly is proposed for the rapid fabrication of stable 3D chiral microstructures. This strategy allows for flexible regulation of the microstructure's shape and properties and has promising applications in various fields.

ADVANCED FUNCTIONAL MATERIALS (2022)

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Article Chemistry, Multidisciplinary

4D Printing of Shape Memory Polymers: From Macro to Micro

Christoph A. Spiegel et al.

Summary: This paper presents a novel and versatile shape memory ink system that enables 4D printing at both the macroscale and microscale using light. The authors selected digital light processing (DLP) and direct laser writing (DLW) as suitable 3D printing technologies and developed a compatible ink system. They demonstrated the shape memory effect for various complex structures printed using DLP and showed remarkable shape memory properties for microstructures printed using DLW.

ADVANCED FUNCTIONAL MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Replicating the Cynandra opis Butterfly's Structural Color for Bioinspired Bigrating Color Filters

Xiaobao Cao et al.

Summary: This study utilizes two-photon laser lithography to fabricate bioinspired bigrating nanostructures, whose optical properties can be controlled by varying the height and period. The research achieves excellent spectral characteristics and high color purity over the entire visible range through combined effects of multilayer interference and diffraction. Such tuneable bigrating structures are of significant utility in color filtering applications.

ADVANCED MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Two-Photon 3D Laser Printing Inside Synthetic Cells

Tobias Abele et al.

Summary: Through two-photon 3D laser printing, high precision hydrogel structures have been successfully manufactured inside preformed lipid vesicles, allowing for the deterministic positioning of cellular components. This technology can also create early functional architectures, such as transmembrane pores, for transporting biological cargo.

ADVANCED MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Reconfiguring Colors of Single Relief Structures by Directional Stretching

Qifeng Ruan et al.

Summary: Color changes can be achieved by straining photonic crystals or gratings embedded in stretchable materials, with trenches generating different colors due to variations in trench depth. Surface-relief elastomers can have multiple states accessible by mechanical straining, providing a promising application potential in optical data archival and anti-counterfeiting.

ADVANCED MATERIALS (2022)

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Article Chemistry, Multidisciplinary

3D Printed, Solid-State Conductive Ionoelastomer as a Generic Building Block for Tactile Applications

Chao Zhang et al.

Summary: A fast photocurable, solid-state conductive ionoelastomer (SCIE) has been developed for high-resolution 3D printing of arbitrary architectures. The printed building blocks possess high-resolution architectures, good Young's modulus, stretchability, excellent conductivity tolerance in a wide range of temperatures, as well as fine elasticity and antifatigue ability even after long-term loading-unloading cycles. Additionally, the printed building blocks can be programmed into 3D flexible tactile sensors with significantly higher sensitivity than their bulky counterparts.

ADVANCED MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Volumetric Bioprinting of Organoids and Optically Tuned Hydrogels to Build Liver-Like Metabolic Biofactories

Paulina Nunez Bernal et al.

Summary: Organ- and tissue-level biological functions are closely related to microscale cell-cell interactions and tissue architecture. Biofabrication and organoid technologies have the potential to engineer multi-scale living constructs. This study introduces a volumetric bioprinting technique that captures key liver functions. The bioprinting process shapes organoid-laden gelatin hydrogels into complex 3D structures, allowing for rapid printing. Optically tuned bioresins and low stiffness gelatins enhance the viability and metabolism of the bioprinted constructs. This technology opens up new possibilities for regenerative medicine and personalized drug testing.

ADVANCED MATERIALS (2022)

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Article Optics

Structuring light using solgel hybrid 3D-printed optics prepared by two-photon polymerization

Shlomi Lightman et al.

Summary: This study utilizes a two-photon polymerization process in three-dimensional direct laser writing to print micrometer-scale refractive phase elements, allowing for the manipulation of incoming Gaussian beams. By tailoring a two-photon absorption process and using a fast solgel process, the researchers were able to shape light beams and improve the optical and mechanical properties of the printed structures. This innovation provides exciting opportunities for compact and robust beam shaping.

APPLIED OPTICS (2022)

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Article Optics

Origination of free-form micro-optical elements using one- and two-photon grayscale laser lithography

Bernhard Lamprecht et al.

Summary: We discuss the development of an origination process for planar free-form micro-optical elements and the description of a self-developed grayscale laser direct-write platform. The process enables the fabrication of complex and optically smooth surface relief structures. Through the combination of one- and two-photon absorption lithography, high-quality micro-relief structures can be achieved. The optical functionality of the fabricated elements was demonstrated through the projection of defined light patterns onto a wall.

APPLIED OPTICS (2022)

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Article Microscopy

Perspective of fibre-optical microendoscopy with microlenses

Baokai Wang et al.

Summary: Fibre-optical microendoscopy, based on fibre-optical confocal scanning microscopy, has brought innovations in imaging, diagnostics, and microsurgery. The lens system plays a significant role in resolution and miniaturization.

JOURNAL OF MICROSCOPY (2022)

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Article Polymer Science

Tetramethacrylic benzylidene cyclopentanone dye for one- and two-photon photopolymerization

Elnara R. Zhiganshina et al.

Summary: The study focused on the synthesis and characterization of a one-component methacrylate material containing the photoinitiator 4MetBAC. The material was used to induce polymerization and create intricate polymer nanostructures, demonstrating biosafety in biological applications. This approach shows promise for creating high-resolution three-dimensional topological structures for optoelectronic and biological applications.

EUROPEAN POLYMER JOURNAL (2022)

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Review Optics

3D Sub-Diffraction Printing by Multicolor Photoinhibition Lithography: From Optics to Chemistry

Minfei He et al.

Summary: Photoinhibition lithography (PIL) is a nanoscale fabrication technique that enables super-resolution 3D printing through the control and confinement of exposed regions for photoinitiation with multicolor visible light. It has diverse applications in photonics, data storage, and biotechnology, with ongoing research on sub-diffraction printing and high-throughput fabrication. Challenges and potential solutions are being discussed to drive technological breakthroughs in PIL for improved resolution and throughput.

LASER & PHOTONICS REVIEWS (2022)

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Article Optics

Two-photon polymerization simulation and fabrication of 3D microprinted suspended waveguides for on-chip optical interconnects

Ricardo M. R. Adao et al.

Summary: This paper presents a 3D morphology prediction tool based on two-photon polymerization microprinting technology for simulating and predicting the performance of on-chip 3D waveguides. The tool reduces the cost of experimental optimization and demonstrates optical transmission properties that are in agreement with simulations.

OPTICS EXPRESS (2022)

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Article Optics

Photonic waveguide bundles using 3D laser writing and deep neural network image reconstruction

Giulia Panusa et al.

Summary: In recent years, 3D printing with multi-photon laser writing has become an important tool for manufacturing three-dimensional optical elements. This study presents the fabrication of polymer rectangular step-index optical waveguide bundles using a commercial 3D printer, and demonstrates the reduction of core-to-core spacing through a deep neural network approach. The findings have significant implications for achieving accurate imaging in applications such as on-chip platforms and microfluidic systems.

OPTICS EXPRESS (2022)

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Article Optics

Geometric control of next-nearest-neighbor coupling in evanescently coupled dielectric waveguides

J. Schulz et al.

Summary: This study experimentally demonstrates that the next-nearest-neighbor coupling in a waveguide array can be naturally negative. By fabricating dielectric zig-zag shaped waveguide arrays and adjusting the angle of the zig-zag shape, it is possible to tune the coupling ratios between positive and negative values, as well as reduce the impact of the coupling to zero at certain angles. The existence of negative couplings is confirmed experimentally and the improved accuracy of a refined tight-binding model is shown. These findings are also important for studying other discrete systems where the tight-binding model is commonly used.

OPTICS EXPRESS (2022)

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Article Multidisciplinary Sciences

Direct-laser writing for subnanometer focusing and single-molecule imaging

Simao Coelho et al.

Summary: Two-photon direct laser writing enables nanometer-accuracy fabrication of three-dimensional structures, providing high-resolution imaging possibilities for optical microscopy.

NATURE COMMUNICATIONS (2022)

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Article Materials Science, Multidisciplinary

Maximizing transmittance in two-photon 3D printed materials for micro-optics in the visible

Mehedy Hasan et al.

Summary: This study characterizes three commercial resins suitable for three-dimensional two-photon printing of micro-optical components for visible light. The results show that different print modes and post-processing conditions can achieve significant variations in printed thickness and transmittance under different light sources.

OPTICAL MATERIALS EXPRESS (2022)

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Article Materials Science, Multidisciplinary

A Miniaturized Imaging Window to Quantify Intravital Tissue Regeneration within a 3D Microscaffold in Longitudinal Studies

Claudio Conci et al.

Summary: The current methods for assessing biomaterial biocompatibility are outdated and unethical, and there is a need for a real-time research method. This study develops and validates the Microatlas window, providing a chicken embryo experimental model for biomaterial biocompatibility assessment and microscope field repositioning.

ADVANCED OPTICAL MATERIALS (2022)

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Article Materials Science, Multidisciplinary

Coupling of molecular vibration and metasurface modes for efficient mid-infrared emission

Yoshiaki Nishijima et al.

Summary: Spectrally selective narrowband mid-infrared radiation absorbance and thermal emittance were achieved through mode coupling between a plasmonic metal-insulator-metal (MIM) metasurface and molecular vibrational mode resonances, with coupling efficiency ranging from approximately 3.9% to 6.6%. Experimentally observed pronounced resonant coupling behavior was well described by finite-difference time-domain simulations, indicating a new paradigm in photo-thermal energy conversion.

JOURNAL OF MATERIALS CHEMISTRY C (2022)

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Article Optics

Nanoscale mapping of optically inaccessible bound-states-in-the-continuum

Zhaogang Dong et al.

Summary: This paper presents the near-field localization of true bound-states-in-the-continuum (BIC) resonance on arrays of silicon nanoantennas using electron energy loss spectroscopy. By breaking the antenna symmetry, emissive quasi-BIC resonances are observed. It is also demonstrated that the quasi-BIC resonances can significantly enhance localized light emission via the Purcell effect.

LIGHT-SCIENCE & APPLICATIONS (2022)

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Article Chemistry, Analytical

Overview of 3D-Printed Silica Glass

Han Zhang et al.

Summary: Researchers are looking for more innovative 3D printing technologies for glass fabrication, which provides a good solution to the complex traditional glass manufacturing process. However, the application of 3D printing in glass fabrication is still in its infancy and faces many challenges.

MICROMACHINES (2022)

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Article Nanoscience & Nanotechnology

Single-Photon Emission from Individual Nanophotonic-Integrated Colloidal Quantum Dots

Alexander Eich et al.

Summary: This study reports on the integration of individual colloidal core-shell quantum dots into a nanophotonic network, allowing for excitation and efficient collection of single photons through separate waveguide channels. The use of an iterative electron beam lithography process enables the positioning of single emitters on a chip with a high yield. This work goes beyond traditional bulk optic methods and provides a pathway for supplying chip-scale quantum networks with single photons from a large number of simultaneously controllable quantum emitters.

ACS PHOTONICS (2022)

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Article Nanoscience & Nanotechnology

Toward 3D-Printed Inverse-Designed Metaoptics

Charles Roques-Carmes et al.

Summary: Optical metasurfaces have the potential to integrate multiple functionalities in a compact form-factor. We propose a framework for the inverse design of multilayer metaoptics via topology optimization, demonstrating high-efficiency multifunctionality in multiangle light concentration and plan-achromaticity. Our approach has been experimentally validated with a 3D-printed light concentrator working at five different nonparaxial angles of incidence.

ACS PHOTONICS (2022)

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Review Chemistry, Multidisciplinary

High-Resolution 3D Printing for Electronics

Young-Geun Park et al.

Summary: Recent advances in high-resolution 3D printing technologies have brought significant potential for freeform electronics, allowing for greater complexity and design freedom. A comprehensive review is provided on 3D-printable functional materials, device components, and the latest developments in 3D-printed electronics.

ADVANCED SCIENCE (2022)

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Article Materials Science, Multidisciplinary

Multi-Photon 4D Printing of Complex Liquid Crystalline Microstructures by In Situ Alignment Using Electric Fields

Alexander Muenchinger et al.

Summary: This approach allows for the alignment of liquid crystal networks or elastomers in three dimensions during multi-photon laser printing, enabling the creation of 3D micro-heterostructures that exhibit large-amplitude elastic actuation under ambient conditions. It involves the use of a specialized sample cell with variable height and optical components to ensure a single well-defined laser focus for different electric field orientations.

ADVANCED MATERIALS TECHNOLOGIES (2022)

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Article Engineering, Manufacturing

Understanding and overcoming proximity effects in multi-spot two-photon direct laser writing

Caroline Arnoux et al.

Summary: This paper investigates the proximity effects in additive manufacturing and proposes a parallel write approach to overcome the limitations caused by these effects. Through experiments and computer simulations, the authors successfully model the effects and demonstrate the effectiveness of the parallel write approach in fabricating structures with submicronic inter-object distances.

ADDITIVE MANUFACTURING (2022)

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Review Optics

Roadmap on topological photonics

Hannah Price et al.

Summary: Topological photonics controls the behavior of light through the design of photonic structures, with potential applications in photonics devices. This roadmap surveys emerging areas of research within this field, with a focus on addressing fundamental scientific questions and presenting exciting opportunities for future research and developments.

JOURNAL OF PHYSICS-PHOTONICS (2022)

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Article Chemistry, Multidisciplinary

High-Order Photonic Cavity Modes Enabled 3D Structural Colors

Hailong Liu et al.

Summary: In this study, a new strategy was devised to generate high-order photonic cavity modes upon side illumination on woodpile photonic crystals, enabling one-step printing of 3D photonic structural colors. The resulting colors are vivid, with a wide spectral range and large viewing angles, and do not require postprocessing or subwavelength features.

ACS NANO (2022)

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Article Physics, Applied

Customizable and highly sensitive 3D micro-springs produced by two-photon polymerizations with improved post-treatment processes

Xinggang Shang et al.

Summary: This study presents the design and manufacturing of triple-helix-shaped micro-springs using two-photon polymerization technology. The mechanical properties, particularly the spring constant, were systematically studied. The results show that the spring constant can be actively tuned over a wide range while maintaining high resolution and agreement.

APPLIED PHYSICS LETTERS (2022)

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Article Physics, Multidisciplinary

Two-Photon Laser Lithography of Active Microcavity Structures

A. Maydykovskiy et al.

Summary: The properties of microcavity structures obtained from hybrid polymers with addition of various dyes were studied. It was demonstrated that the luminescent properties of the activated polymers can be preserved under intense laser irradiation, and the exposure of two-photon laser lithography can be reduced significantly in the presence of a specific dye.

JETP LETTERS (2022)

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Article Polymer Science

Replicating 3D printed structures into functional materials

Qiaoyi Wang et al.

Summary: Three-dimensional (3D) printing has gained attention, but the limited library of printable materials hinders its applications. Researchers have developed a convenient method to replicate 3D-printed structures into different functional materials. The replication process maintains high fidelity and allows for further reduction of feature sizes.

JOURNAL OF APPLIED POLYMER SCIENCE (2022)

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Article Chemistry, Multidisciplinary

Triplet-Triplet Annihilation Photopolymerization for High-Resolution 3D Printing

David K. Limberg et al.

Summary: This study demonstrates a 3D printing method based on TTAP, which utilizes a continuous visible LED light source to achieve submicron resolution. This approach eliminates the need for high-intensity femtosecond laser pulses, offering the potential for low-cost 3D printing with high resolution.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2022)

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Article Engineering, Electrical & Electronic

Microscale white light emitters fabricated by two-photon polymerization lithography on functional resist

Guilherme Osvaldo Dias et al.

Summary: Micrometric white light emitters were fabricated using two-photon polymerization lithography, with a chemically modified resist doped with fluorescent molecules to emit light in the visible region. The spectroscopic and chromaticity properties of the fabricated microscale structures were investigated, and structures emitting high quality white light were obtained. A lifetime study was conducted to explore the potential use of these structures as light sources for on chip integrated photonic devices.

MICROELECTRONIC ENGINEERING (2022)

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Article Chemistry, Multidisciplinary

Three-Dimensional Plasmonic Nanocluster-Driven Light-Matter Interaction for Photoluminescence Enhancement and Picomolar-Level Biosensing

Won-Geun Kim et al.

Summary: Plasmonic nanoparticle clusters offer unique electromagnetic responses at optical frequencies and can be used for nanophotonic applications. This study presents a novel strategy for fabricating three-dimensional nanoparticle clusters with efficient coupling between gold nanoparticles and other nanomaterials. Quantum dots embedded in the clusters exhibit a blue shift in emission spectrum. In addition, an ultracompact diagnostic platform is demonstrated for detecting viruses and mutations.

NANO LETTERS (2022)

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Article Multidisciplinary Sciences

Triplet fusion upconversion nanocapsules for volumetric 3D printing

Samuel N. Sanders et al.

Summary: This study presents a method of volumetric printing using triplet fusion upconversion at low power excitation, overcoming the limitations of nanoscale applications. The introduction of an excitonic strategy allows for the control of the upconversion threshold, supporting different printing schemes.

NATURE (2022)

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Article Optics

Non-Abelian braiding on photonic chips

Xu-Lin Zhang et al.

Summary: The study successfully demonstrates non-Abelian braiding by controlling the geometric-phase matrix in a photonic chip, observing its key characteristics crucial for realizing quantum logics. The experiment showed the swapping of photon dwell sites in both classical-light and single-photon experiments, indicating the potential for implementing non-Abelian physics in photonics. The proposed on-chip photonic system opens up possibilities for studying non-Abelian physics and may lead to the development of next-generation non-Abelian photonic devices.

NATURE PHOTONICS (2022)

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Article Multidisciplinary Sciences

An open source three-mirror laser scanning holographic two-photon lithography system

Marco Pisanello et al.

Summary: This paper presents a custom design for a holographic multibeam two-photon polymerization system using a phase-only spatial light modulator and a three-mirror scanhead. The design overcomes the loss of virtual conjugation and extends the writing field of view, making it a powerful tool for advanced micro and nano-fabrications on large areas.

PLOS ONE (2022)

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Article Multidisciplinary Sciences

Volumetric additive manufacturing of silica glass with microscale computed axial lithography

Joseph T. Toombs et al.

Summary: This article introduces a glass processing method for manufacturing complex microscopic structures. With microscale computed axial lithography, various microfluidic structures, micro-optical elements, and high-strength frameworks with different sizes and shapes can be fabricated.

SCIENCE (2022)

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Article Chemistry, Multidisciplinary

3D-Printed Micro Lens-in-Lens for In Vivo Multimodal Microendoscopy

Jiawen Li et al.

Summary: Multimodal microendoscopes enable simultaneous structural and molecular measurements in vivo, providing valuable insights into pathological changes associated with diseases. However, different optical imaging modalities have conflicting requirements for lens design, posing a challenge for the fabrication of miniaturized imaging probes. This study demonstrates an optical design using two-photon 3D printing to create a miniaturized lens that is optimized for both fluorescence and optical coherence tomography (OCT) imaging. The lens-in-lens design shows significant improvement in fluorescence sensitivity compared to conventional fiber-optic design approaches, and is successfully integrated into an intravascular catheter probe for simultaneous OCT and fluorescence imaging of a mouse artery in vivo.

SMALL (2022)

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Article Chemistry, Multidisciplinary

Two-Photon 3D Printing in Metal-Organic Framework Single Crystals

Yusheng Zhang et al.

Summary: This study demonstrates the technology of two-photon polymerization inside a metal-organic framework crystal. Complex microstructures are built in the porous crystal to create a hybrid of crystal and microstructure. The metal-organic framework can be removed by acid treatment to release the printed structure. This technology has potential applications in MOF sensor device fabrication and data storage.

SMALL (2022)

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Article Multidisciplinary Sciences

λ/30 inorganic features achieved by multi-photon 3D lithography

Feng Jin et al.

Summary: In this study, the high-resolution fabrication of hydrogen silsesquioxane (HSQ) using femtosecond laser direct writing (FsLDW) was demonstrated. A feature size of 26 nm in HSQ was achieved using a 780 nm femtosecond laser. The HSQ microstructures fabricated by FsLDW showed nanoscale resolution, smooth surface, and high thermal stability, indicating potential application in the fabrication of micro-nano devices.

NATURE COMMUNICATIONS (2022)

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Article Materials Science, Multidisciplinary

Additive Manufacturing of 3D Luminescent ZrO2:Eu3+ Architectures

Jedrzej Winczewski et al.

Summary: This study develops a tailor-made organo-metallic resin suitable for two-photon lithography, which enables the additive manufacturing of 3D luminescent microarchitectures emitting light in the visible range. Through thermal treatment in an oxygen-rich atmosphere, silicon-free ZrO2 structures can be created using this resin, which is compatible with a luminescent activator and allows for tuning of the optical properties.

ADVANCED OPTICAL MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Controlling Light in Scattering Materials for Volumetric Additive Manufacturing

Jorge Madrid-Wolff et al.

Summary: 3D printing has revolutionized manufacturing in many areas. Developments in light-based techniques using photocurable resins have led to shorter print times and higher resolution. However, these techniques are limited to homogeneous and transparent resins due to the interference caused by light scattering. This study proposes a method that takes into account light scattering in the resin to improve the printing process. Experimental results demonstrate the importance of this correction, particularly when printing objects that exceed the scattering mean free path. The technique shows promising applications in printing within turbid materials, with potential benefits for bioprinting cell-laden constructs.

ADVANCED SCIENCE (2022)

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Article Chemistry, Multidisciplinary

High-Precision Printing of Complex Glass Imaging Optics with Precondensed Liquid Silica Resin

Zhihan Hong et al.

Summary: This paper introduces a new liquid silica resin and a printing process for high-precision glass optics. The proposed method can print various optical surfaces with accurate shape and high quality, suitable for imaging applications. It also enables the printing of complex optical systems with multiple elements, enhancing system flexibility and functionality.

ADVANCED SCIENCE (2022)

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Review Optics

Additive manufacturing for the development of optical/photonic systems and components

Gregory Berglund et al.

Summary: The ambition of this review is to provide an up-to-date synopsis of the state of 3D printing technology for optical and photonic components, to gauge technological advances, and to discuss future opportunities. While a range of approaches have been developed and some have been commercialized, no single approach can yet simultaneously achieve small detail and low roughness at large print volumes and speed using multiple materials. Instead, each approach occupies a niche where the components/structures that can be created fit within a relatively narrow range of geometries with limited material choices.

OPTICA (2022)

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Review Optics

3D printing of optical materials by processes based on photopolymerization: materials, technologies, and recent advances

Emma Geisler et al.

Summary: 3D printing technologies have significant potential in optical applications, but there is still a need for materials and processes that are perfectly suited for these applications.

PHOTONICS RESEARCH (2022)

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Article Engineering, Manufacturing

The influence of printing parameters on multi-material two-photon polymerisation based micro additive manufacturing

Qin Hu et al.

Summary: This study investigates the correlation between printing parameters, resin composition and the final properties of 2PP structures, and advances the understanding of 2PP process to enable controlled deposition of various materials and manufacture of complex 3D structures.

ADDITIVE MANUFACTURING (2022)

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Article Nanoscience & Nanotechnology

Two-Photon Laser Microprinting of Highly Ordered Nanoporous Materials Based on Hexagonal Columnar Liquid Crystals

Joeel Monti et al.

Summary: This research develops a new approach for the fabrication of ordered nanoporous microstructures based on supramolecular liquid crystals using two-photon laser printing. The presence of photopolymerizable groups enables the printability of the materials. The study demonstrates the conservation of the materials' arrangement and adsorptive properties after laser microprinting, showing the potential of this approach for functional nanoporous structure fabrication.

ACS APPLIED MATERIALS & INTERFACES (2022)

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Article Nanoscience & Nanotechnology

Dip-In Photoresist for Photoinhibited Two-Photon Lithography to Realize High-Precision Direct Laser Writing on Wafer

Chun Cao et al.

Summary: In this study, a refractive index matched photoresist with effective photoinhibition capacity was developed, enabling ultrahigh precision fabrication on wafer. The minimum critical dimension of 39 nm was successfully achieved on wafer through dip-in PI-TPL, paving the way for subdiffraction silicon-based chip manufacturing. Moreover, the combination of the developed photoresist and dip-in mode allows for the fabrication of tall and high-precision three-dimensional nanostructures.

ACS APPLIED MATERIALS & INTERFACES (2022)

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Article Chemistry, Multidisciplinary

Stiff Shape Memory Polymers for High-Resolution Reconfigurable Nanophotonics

Wang Zhang et al.

Summary: In this study, a stiff shape memory polymer was developed to solve the stiction problem in the deformed state, allowing shape recovery. Nanopillars with high resolution and aspect ratio were fabricated using two-photon lithography, enabling reconfigurable structural color prints and holograms.

NANO LETTERS (2022)

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Article Chemistry, Multidisciplinary

3D Printed Microstructures Erasable by Darkness

Steven C. Gauci et al.

Summary: This article introduces a unique photoresist for direct laser writing (DLW) that is capable of printing 3D microstructures which can be erased by exposure to darkness. By using light-stabilized dynamic materials, microstructures that remain stable under continuous green light irradiation but degrade once the light source is switched off are fabricated. In-depth analysis of the degradation and light stabilization properties showcase the potential of this photoresist to control the release and impart responsive behavior onto printed structures.

ADVANCED FUNCTIONAL MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Visible-Light-Degradable 3D Microstructures in Aqueous Environments

Marvin Gernhardt et al.

Summary: Direct laser writing (DLW), also known as two-photon laser lithography, is an established technique for fabricating functional 3D microstructures. This study introduces a novel photoresist based on the bimane group that can be degraded under mild conditions using water and visible light. The degradation process of the microstructures is tracked and quantified using AFM measurements. The research investigates the influence of writing parameters and degradation conditions, providing clear evidence of effective visible light degradation in aqueous environments. The utility of the photodegradable resist system is demonstrated by incorporating it into multimaterial 3D microstructures.

ADVANCED MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Multiphoton Lithography of Organic Semiconductor Devices for 3D Printing of Flexible Electronic Circuits, Biosensors, and Bioelectronics

Omid Dadras-Toussi et al.

Summary: By incorporating organic semiconductor materials and utilizing multiphoton lithography technology, three-dimensional OS composite microstructures with high electrical conductivity and biocompatibility were successfully fabricated, providing an efficient platform for sensitive glucose detection in biosensors.

ADVANCED MATERIALS (2022)

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Article Optics

Generation of mid-infrared vortex beams by 3-D printed polymer phase plates

Junchao Zhou et al.

Summary: Polymer based spiral phase plates (SPP) created through three dimensional direct laser writing method were used to demonstrate the characteristics of light carrying vortex beams in the mid-infrared region. This technology provides crucial integrated components for exploring quantum photonics and optical communications.

OPTICS AND LASER TECHNOLOGY (2022)

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Article Materials Science, Multidisciplinary

Synthesis and application of triphenylamine-based aldehydes as photo-initiators for multi-photon lithography

D. Ladika et al.

Summary: Three new triphenylamine derivatives with formyl groups were synthesized and evaluated as photo-initiators for multi-photon lithography. The efficiency of photo-polymerization was tested using two different setups and for various applications. The results show that these photo-initiators are a viable alternative to standard ones, thanks to their wide fabrication window, well-defined 3D prints in the sub-micron range, and solubility.

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING (2022)

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Article Multidisciplinary Sciences

Three-dimensional nanofabrication via ultrafast laser patterning and kinetically regulated material assembly

Fei Han et al.

Summary: A major challenge in nanotechnology is the fabrication of complex 3D structures with desired materials. This study presents a strategy using a library of materials to fabricate arbitrary 3D nanostructures. By using hydrogel templates and fine-tuning exposure strategies, high-resolution 2D and 3D structures are achieved. Fabricated nanodevices demonstrate their designed functionality and precision, offering further possibilities for nanodevice design.

SCIENCE (2022)

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Article Engineering, Manufacturing

4D printing of shape-changing structures based on IPN epoxy composites formed by UV post-curing and ?-ray radiation

Linlin Wang et al.

Summary: A strategy for double networks in epoxy resin is proposed to improve the performances of printed structures, with characteristics of high Young's modulus and fracture strain. The IPN epoxy/GFs composites have potential applications in manufacturing smart deployable structures, medical devices, and automobile shell parts.

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING (2022)

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Article Multidisciplinary Sciences

Electro-active metaobjective from metalenses-on-demand

Julian Karst et al.

Summary: This study demonstrates electrically switchable metallic polymer metalenses, whose optical states and focal length can be adjusted via CMOS compatible voltages, opening up new possibilities for ultra-compact photonic integration.

NATURE COMMUNICATIONS (2022)

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Article Multidisciplinary Sciences

Direct retrieval of Zernike-based pupil functions using integrated diffractive deep neural networks

Elena Goi et al.

Summary: This article presents a compact optical-electronic module based on multi-layered diffractive neural networks that can directly retrieve pupil phase information from an imaging sensor. Compared to current phase retrieval schemes, this module has a smaller size and higher practical value.

NATURE COMMUNICATIONS (2022)

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Article Multidisciplinary Sciences

Plasmonic bound states in the continuum to tailor light-matter coupling

Andreas Aigner et al.

Summary: Researchers have designed and successfully fabricated plasmonic nanofin metasurfaces, which play a crucial role in nanophotonics. By manipulating the geometric parameters, they achieved high-quality factor modes and demonstrated powerful performance in molecular sensing. The precise control of light-matter interactions is essential in this study. This research provides a new approach for enhancing light-matter interactions in various applications.

SCIENCE ADVANCES (2022)

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Article Chemistry, Multidisciplinary

Functional Shape-Morphing Microarchitectures Fabricated by Dynamic Holographically Shifted Femtosecond Multifoci

Leran Zhang et al.

Summary: This work introduces a new method for manufacturing functional microdevices based on responsive hydrogel. By combining holograms with lens phase modulation, multiple femtosecond laser spots are generated and shifted for rapid prototyping of three-dimensional shape-morphing structures. This method, which does not require any moving equipment, offers a facile and flexible approach for fabricating high-performance microcage arrays and arrayed analytical platforms.

NANO LETTERS (2022)

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Article Engineering, Manufacturing

Characterization of two-photon photopolymerization fabrication using high-speed optical diffraction tomography

Yanping He et al.

Summary: Two-photon photopolymerization (TPP) is a popular method for fabricating three-dimensional micro- and nanostructures. This study proposes a non-invasive solution using optical diffraction tomography (ODT) to fully characterize TPP-fabricated structures, improving fabrication quality and reproducibility.

ADDITIVE MANUFACTURING (2022)

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Article Engineering, Manufacturing

Modeling of two-photon polymerization in the strong-pulse regime

Mingman Sun et al.

Summary: This study simulated two-photon polymerization process and validated the model reliability. The research showed that using fewer but higher energy pulses is more energy-efficient under lower pulse energy, while energy waste occurs under higher pulse energy.

ADDITIVE MANUFACTURING (2022)

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Article Optics

3D-printed facet-attached optical elements for beam shaping in optical phased arrays

Stefan Singer et al.

Summary: We demonstrate an optical phased-array that can shape and deflect emitted beams. By using a 3D-printed facet-attached element, the beam shaper can be precisely aligned with on-chip waveguide structures. In the proof-of-concept experiment, a large steering range and small beam divergence are achieved. This concept provides an attractive alternative for various integration platforms.

OPTICS EXPRESS (2022)

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Article Optics

Towards efficient structure prediction and pre-compensation in multi-photon lithography

Nicolas Lang et al.

Summary: This study presents a simple, fast, and easily implementable algorithm for predicting the final structure topography in multi-photon lithography. The algorithm approximates the three main steps of lithography and shows promising results in agreement with experimental observations. The use of a Downhill-Simplex algorithm for parameter optimization significantly reduces deviations and enables the production of highly conformal and high-quality microstructures.

OPTICS EXPRESS (2022)

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Article Optics

Smart grating coupled whispering-gallery-mode microcavity on tip of multicore optical fiber with response enhancement

Feiyang Hou et al.

Summary: This study presents a method of coupling a smart grating to a whispering-gallery-modes (WGMs) microcavity, aiming to enhance the responses to chemical and thermal stimulations. The deformation of the smart grating induces changes in the coupling distance, which leads to additional increments in the intrinsic wavelength shifts of the microcavity. The results have significant implications for the design of chemical and temperature sensors based on WGMs microcavities.

OPTICS EXPRESS (2022)

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Article Optics

Rapid aberration correction for diffractive X-ray optics by additive manufacturing

Frank Seiboth et al.

Summary: In this study, we present a method to overcome manufacturing challenges in hard X-ray optics using a tailor-made refractive phase plate. With at-wavelength metrology and rapid prototyping, we demonstrate aberration correction for crossed multilayer Laue lenses, improving image quality significantly.

OPTICS EXPRESS (2022)

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Article Optics

Far-field lithography through saturated resonance energy transfer

Nikolaos Liaros

Summary: A method based on resonance energy transfer is proposed for writing three-dimensional features in the far field. The saturation of energy transfer induces a nonlinear intensity response, enabling three-dimensional nanofabrication without ultrafast excitation. Addition of a second, spatially shaped beam allows nanopatterning below the diffraction limit.

OPTICS LETTERS (2022)

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Article Chemistry, Multidisciplinary

3D-Printed Mobius Microring Lasers: Topology Engineering in Photonic Microstructures

Xianqing Lin et al.

Summary: This article introduces a method of using femtosecond laser direct writing technique to fabricate 3D topological Mobius microring resonators and their application in photon manipulation. Unlike traditional resonators, the topological Mobius microring resonator can output laser signals with all polarization states, representing an important advancement in 3D topological photonics.

SMALL (2022)

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Article Multidisciplinary Sciences

3D printing colloidal crystal microstructures via sacrificial-scaffold-mediated two-photon lithography

Keliang Liu et al.

Summary: The authors demonstrate a sacrificial-scaffold-mediated two-photon lithography strategy that enables the fabrication of complex 3D colloidal crystal microstructures with orderly arranged nanoparticles in the bulk.

NATURE COMMUNICATIONS (2022)

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Article Multidisciplinary Sciences

An achromatic metafiber for focusing and imaging across the entire telecommunication range

Haoran Ren et al.

Summary: The authors have successfully fabricated a 3D achromatic diffractive metalens on the end face of a single-mode fiber, capable of achieving achromatic and polarization-insensitive focusing. This technology has potential applications in various fields, including endoscopic imaging, laser treatment, deep tissue imaging, and fiber-optic communications.

NATURE COMMUNICATIONS (2022)

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Article Biochemical Research Methods

Femtosecond laser dentistry for precise and efficient cavity preparation in teeth

Ludovic Rapp et al.

Summary: This study utilized high fluence focused femtosecond laser pulses to perform fast, high precision and minimally damaging cavity cutting of teeth at room temperature without irrigation or cooling system. No chemical change in the composition of enamel and dentin was observed, and the increase in dental pulp temperature during the laser procedure was within an acceptable limit.

BIOMEDICAL OPTICS EXPRESS (2022)

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Article Materials Science, Multidisciplinary

Modified photoresins with tunable refractive index for 3D printed micro-optics

R. S. Ketchum et al.

Summary: Modern two-photon lithography (TPL) technologies provide convenient methods for 3D printing sub-micron featured structures in photopolymers. TPL is a valuable tool for rapid prototyping of micro-optics, photonic metamaterials, and nanostructures. The ability to tune the optical properties of the resin materials used for TPL greatly expands the capabilities of 3D printing these types of components.

OPTICAL MATERIALS EXPRESS (2022)

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Article Materials Science, Multidisciplinary

High resolution femtosecond direct laser writing with wrapped lens

Andrea Toulouse et al.

Summary: Wrapped writing mode is a simple and cost-effective approach to multiphoton stereolithography, offering wide application prospects. By using a thin cling foil to shield the objective, it ensures writing resolution without direct contact. Moreover, this method is not limited by the working distance height of the objective and can be used for prototyping various formulations.

OPTICAL MATERIALS EXPRESS (2022)

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Article Materials Science, Multidisciplinary

3D optomechanical metamaterials

Alexander Muenchinger et al.

Summary: Mechanical metamaterials composed of liquid-crystal elastomers have the capability to change their properties under external stimulus. By presenting two examples, we demonstrate the responsiveness of these metamaterials and overcome previous limitations.

MATERIALS TODAY (2022)

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Letter Chemistry, Multidisciplinary

Full Geometric Control of Hidden Color Information in Diffraction Gratings under Angled White Light Illumination

John You En Chan et al.

Summary: In this study, a versatile nanofabrication technique called two-photon polymerization lithography was used to vary the geometric parameters in gratings and encode hidden color information. Two design approaches were used to hide color information in the gratings, and different images were revealed under oblique incidence and varying sample rotation angles.

NANO LETTERS (2022)

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Article Chemistry, Multidisciplinary

Direct Observation of Spin-Orbit Interaction of Light via Chiroptical Responses

Jincheng Ni et al.

Summary: This study demonstrates the spin-orbit interaction of light in the form of strong chiroptical responses by breaking the symmetry. The generated chiroptical spectra can be tuned for different photonic orbital angular momenta and microdisk diameters.

NANO LETTERS (2022)

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Article Optics

Light-sheet 3D microprinting via two-colour two-step absorption

Vincent Hahn et al.

Summary: In recent years, there has been a growing interest in high-speed, high-resolution optics-based 3D printing technology. By combining image projection with optical nonlinearity, researchers have successfully achieved high printing rates with small voxel volumes.

NATURE PHOTONICS (2022)

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Article Optics

Vortex-Bessel beam generation by 3D direct printing of an integrated multi-optical element on a fiber tip

Shlomi Lightman et al.

Summary: This study demonstrates the fabrication of a high-order Bessel beam on the tip of an optical fiber using 3D-direct laser writing technology. The beam shaping is achieved by an integrated micro-optical system, resulting in the generation of a Bessel beam carrying orbital angular momentum. The characteristics of the generated beam are analyzed and measured, showing the expected properties.

OPTICS LETTERS (2022)

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Article Optics

Generation of Bessel beams via femtosecond direct laser writing 3D phase plates

Jue Wang et al.

Summary: Bessel beams with diffracting-free propagation and self-reconstruction have attracted great interest for their potential applications. This study successfully generated zeroth- and higher-order Bessel beams with propagation invariance using the femtosecond direct laser writing technique, providing possibilities for integrated optics applications.

OPTICS LETTERS (2022)

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Article Multidisciplinary Sciences

3D nanoprinting of semiconductor quantum dots by photoexcitation-induced chemical bonding

Shao-Feng Liu et al.

Summary: Researchers have developed a polymerization-independent laser direct writing technique for printing arbitrary 3D quantum dot structures with nanoscale resolution. This technique improves material purity and intrinsic properties, and holds potential for the manufacturing of optoelectronic devices.

SCIENCE (2022)

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Article Multidisciplinary Sciences

Miniature optoelectronic compound eye camera

Zhi-Yong Hu et al.

Summary: Researchers have demonstrated the potential of a miniature optoelectronic integrated compound eye camera by manufacturing polymer compound eyes with logarithmic profile ommatidia, which enables large field-of-view imaging, spatial position identification, and sensitive trajectory monitoring of moving targets. This insect-scale camera holds great promise for cutting-edge applications in endoscopy and robot vision by integrating well-developed planar imaging sensors with complex micro-optics elements.

NATURE COMMUNICATIONS (2022)

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Article Nanoscience & Nanotechnology

Superconducting Single-Photon Spectrometer with 3D-Printed Photonic-Crystal Filters

You Xiao et al.

Summary: The spectrometer combines a superconducting single-photon detector array and 3D-printed photonic-crystal filters, achieving a system sensitivity down to -108.2 dBm and a resolution of 5 nm from 1200 to 1700 nm.

ACS PHOTONICS (2022)

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Article Nanoscience & Nanotechnology

3D-Nanoprinted Antiresonant Hollow-Core Microgap Waveguide: An on-Chip Platform for Integrated Photonic Devices and Sensors

Johannes Buerger et al.

Summary: The antiresonant hollow-core microgap waveguide is presented as a platform for on-chip investigation of light-gas interaction over centimeter-long distances. It demonstrates unique properties such as high contrast resonance, extremely broadband transmission windows, and high structural openness factor. The platform allows for spectral control and tuning through nanoprinting. It has potential applications in various spectroscopy-related fields, including bioanalytics, environmental sciences, and life sciences.

ACS PHOTONICS (2022)

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Article Chemistry, Multidisciplinary

XCT and DLW: Synergies of Two Techniques at Sub-Micrometer Resolution

Sven Fritzsche et al.

Summary: The article introduces the methods of direct laser writing (DLW) and X-ray computed tomography (XCT) for manufacturing and analyzing polymer structures at the microscale. Through experiments, the article demonstrates the detection and analysis capability of XCT for internal defects in the manufactured structures, as well as the three-dimensional reconstruction of hidden features of the structures. It also shows the advantage of direct fabrication on PET substrate.

APPLIED SCIENCES-BASEL (2022)

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Review Engineering, Manufacturing

4D printing of shape memory polymer composites: A review on fabrication techniques, applications, and future perspectives

Muhammad Yasir Khalid et al.

Summary: In recent years, there has been increasing interest in additively manufactured shape memory polymers (SMPs) and their multi-functional composites. 4D printing, which utilizes time-responsive programmable materials, has been a fascinating field in additive manufacturing. Stimuli-responsive polymers are capable of retaining their original shapes when exposed to diverse external stimuli. The integration of 4D printing and shape memory polymer composites (SMPCs) has led to rapid technological advancements in smart and multi-functional materials. The use of 4D printing for SMPCs has enabled exploration of various engineering applications.

JOURNAL OF MANUFACTURING PROCESSES (2022)

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Article

Emerging techniques for customized fabrication of glass

Xiaofeng Liu et al.

Journal of Non-Crystalline Solids: X (2022)

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Article Chemistry, Multidisciplinary

3D Direct Laser Writing of Highly Absorptive Photoresist for Miniature Optical Apertures

Michael D. Schmid et al.

ADVANCED FUNCTIONAL MATERIALS (2022)

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Article Metallurgy & Metallurgical Engineering

Femtosecond aser direct writing 3D micro/nano-lithography using VIS-light oscillator

Antanas Butkus et al.

Summary: In this study, a novel femtosecond laser direct writing method was reported, which can structure pre-polymers without using photo-initiators. The experimental work is of high importance for widening the applications of laser additive manufacturing.

JOURNAL OF CENTRAL SOUTH UNIVERSITY (2022)

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Article Optics

Characterization of two-photon-polymerization lithography structures via Raman spectroscopy and nanoindentation

Severin Schweiger et al.

Summary: Additive manufacturing using two-photon polymerization (TPP) lithography is widely used and studied. This research investigated the mechanical material properties of cuboid structures fabricated using TPP lithography by conducting parameter sweeps and material tests. The results showed significant variations in material properties among different photo-resists.

JOURNAL OF OPTICAL MICROSYSTEMS (2022)

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Article Optics

Two-photon polymerization as a potential manufacturing tool for biomimetic engineering of complex structures found in nature

Gordon Zyla et al.

Summary: This study successfully utilized 3D printing by two-photon polymerization to engineer biomimetic surface structures inspired by blue-winged butterflies. The printed structures displayed angle-insensitive optical properties similar to the Morpho wings. The researchers also analyzed the morphology and optical properties of the biological and engineered specimens and compared the coloration of biomimetic surfaces with that of the Morpho butterfly.

JOURNAL OF OPTICAL MICROSYSTEMS (2022)

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Article Optics

Beyond Lambertian light trapping for large-area silicon solar cells: fabrication methods

Jovan Maksimovic et al.

Summary: Light trapping photonic crystal (PhC) patterns on the surface of Si solar cells provide a novel opportunity for approaching the theoretical efficiency limit. Two surface patterning methods are compared, along with electron beam lithography. Spectral characterization of the PhC light trapping is also discussed.

OPTO-ELECTRONIC ADVANCES (2022)

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Article Optics

Laser additive manufacturing of Si/ZrO2 tunable crystalline phase 3D nanostructures

Greta Merkininkaite et al.

Summary: This study focuses on the rapidly developing field of inorganic material 3D object production at the nano-/micro scale. The researchers used laser lithography and heat treatment to fabricate a series of organometallic polymer precursors with different silicon and zirconium ratios. The spatial downscaling and surface morphology of these structures were evaluated, and a crystalline phase was confirmed through X-ray diffraction analysis. The fabricated 3D objects retained their complex geometry without distortion after heat treatment, and achieved a new record of resolution below 60 nm. This preparation protocol is promising for the manufacturing of high precision micro/nano-devices with resistance to high temperature and aggressive environments.

OPTO-ELECTRONIC ADVANCES (2022)

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Article Nanoscience & Nanotechnology

Combining one and two photon polymerization for accelerated high performance (3+1)D photonic integration

Adria Grabulosa et al.

Summary: This study combines one-photon and two-photon polymerization techniques to achieve fast manufacturing of vertical waveguides and improve optical performance. This technology is significant for addressing thermal energy dissipation in 3D electronic integration.

NANOPHOTONICS (2022)

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Article Chemistry, Physical

Temperature-Responsive 4D Liquid Crystal Microactuators Fabricated by Direct Laser Writing by Two-Photon Polymerization

Marc del Pozo et al.

Summary: Liquid crystalline photoresists can be used to fabricate highly crosslinked 4D microactuators with unique polarization colors, enabling complex tasks and anti-anticounterfeiting microdevices.

SMALL STRUCTURES (2022)

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Article Nanoscience & Nanotechnology

Nanophotonic Structural Colors

Soroosh Daqiqeh Rezaei et al.

Summary: The article introduces the traditional and new definitions of structural colors, discusses the physical phenomena and main application areas of structural colors, summarizes the materials and structures used to generate structural coloration, and the latest advances in dynamic structural colors.

ACS PHOTONICS (2021)

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Article Biochemical Research Methods

3D-Printedhigh-NAcatadioptric thin lens for suppression ofXPMbackground in Stimulated Raman Scattering microscopy

Andrea Bertoncini et al.

Summary: The 3D printed high NA compact catadioptric lens effectively eliminates the spurious background signals induced by XPM in SRS measurements, enabling convenient collection of high-quality SRS signals. This lens not only rivals high-NA microscope objectives in signal collection, but also demonstrates compatibility with other nonlinear microscopies associated with SRS in multimodal microscopes.

JOURNAL OF BIOPHOTONICS (2021)

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Article Nanoscience & Nanotechnology

Three-Dimensional Photoluminescent Crypto-Images Doped with (CdSe)ZnS Quantum Dots by One-Photon and Two-Photon Polymerization

Tiziana Ritacco et al.

Summary: Three-dimensional photoluminescent crypto-images can be created using quantum dots within polymeric micro-objects. By utilizing two-photon polymerization direct laser writing, majority of QDs are expelled from the irradiated area due to monomer cross-linking. Physical phenomena of QDs excitation and surrounding thermal polymerization can be combined to control local density of QDs with nanometric resolution and tune local photoemission.

ACS APPLIED NANO MATERIALS (2021)

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Article Optics

Two-photon lithography of fluorescence-encoded quick-read micro-code for anti-counterfeiting applications

Arun Jaiswal et al.

Summary: Anti-counterfeiting tags are crucial for preventing duplication of valuable products, but newer technologies have made it increasingly difficult to detect forgeries. The proposed sub-micron-scale fluorescent tag design allows for encoded messages to be visible under ultraviolet light, providing layered security measures against counterfeiting.

JOURNAL OF PHYSICS-PHOTONICS (2021)

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Article Optics

Design and two-photon direct laser writing of low-loss waveguides, tapers and S-bends

Tigran Baghdasaryan et al.

Summary: This study focused on the efficient design of optical waveguide-based building blocks using two-photon polymerization-based direct laser writing. Numerical investigations were conducted on air-clad waveguides, tapers, and S-bends to minimize insertion losses and reduce device sizes. The research successfully demonstrated waveguides with square and circular cross-sections mode-matched with single-mode optical fibers, identified parabolic tapers for adiabatic transitions between different waveguide sizes, and designed optimized S-bends with Bezier curve shapes. These components were fabricated and confirmed to have nearly lossless performance. The study provides design rules and ready-to-use recipes for fabricating low-loss 3D-printed waveguide-based building blocks, aiming to inspire the development of efficient photonic devices for diverse application fields.

JOURNAL OF PHYSICS-PHOTONICS (2021)

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Article Nanoscience & Nanotechnology

Wide-Gamut Biomimetic Structural Colors from Interference-Assisted Two-Photon Polymerization

Hongcheng Gu et al.

Summary: Two-photon polymerization (TPP) with interference assistance allows for precise control of coloration, producing biomimetic structural colors inspired by Morph butterflies. The technology has been systematically studied for coloration mechanisms and can be widely used in applications such as displays, decoration, and sensing.

ACS APPLIED MATERIALS & INTERFACES (2021)

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Article Chemistry, Multidisciplinary

Printable Nanocomposite Metalens for High-Contrast Near-Infrared Imaging

Gwanho Yoon et al.

Summary: Printable metalenses made of a silicon nanocomposite offer high refractive index and thermal stability, suitable for intricate nanofabrication and rapid large-scale manufacturing. By optimizing the composition of the nanocomposite, the focusing efficiency of the metalenses can be further increased.

ACS NANO (2021)

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Article Chemistry, Multidisciplinary

Two-Photon Laser-Written Photoalignment Layers for Patterning Liquid Crystalline Conjugated Polymer Orientation

Yuping Shi et al.

Summary: Systematic tuning of chemical and physical structure allows fine control over desired electronic and optical properties in conjugated polymer semiconductors. By using photoalignment, it is possible to achieve orientation in liquid crystalline polymers for desired optical anisotropies.

ADVANCED FUNCTIONAL MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Stimuli Responsive Shape Memory Microarchitectures

Luizetta Elliott et al.

Summary: The research focuses on utilizing benzyl methacrylate-based SMPs to create 3D structures with shape transformation capabilities through two photon lithography. The structures exhibit features such as 500 nm thick petals and 2.5 µm unit cells in cubic lattices.

ADVANCED FUNCTIONAL MATERIALS (2021)

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Review Chemistry, Multidisciplinary

3D Printed Flexible Strain Sensors: From Printing to Devices and Signals

Haodong Liu et al.

Summary: The revolutionary advancements in flexible electronics offer great potential for wearable devices and electronic skin, with flexible strain sensors serving as essential components in integrated electronic systems. 3D printing technology is preferred for manufacturing flexible strain sensors due to its cost-effectiveness, accuracy, and efficiency. Various printing methods, such as DLP, FDM, and DIW, are discussed in this study, along with the sensing mechanisms of the printed sensors and suggestions for future research directions.

ADVANCED MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Two-Photon Polymerization of Nanocomposites for the Fabrication of Transparent Fused Silica Glass Microstructures

Frederik Kotz et al.

Summary: Fused silica glass is an ideal material for high-performance optics, and direct laser writing (DLW) can be used to generate transparent fused silica glass microstructures with resolutions on the scale of tens of micrometers. This technology has the potential to enable a wide range of applications in next-generation optics and photonics, as well as microfluidics and biomedical fields.

ADVANCED MATERIALS (2021)

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Review Engineering, Multidisciplinary

3D printing for polymer/particle-based processing: A review

Weiheng Xu et al.

Summary: The 3D printing technology, also known as additive manufacturing, has great potential in manufacturing but requires further research to develop new mechanisms for multi-material manufacturing. Materials with unique properties, such as particles, can find broad applications in various fields. This review provides an overview of different 3D printing mechanisms and summarizes the processing parameters, advantages, disadvantages, and future challenges.

COMPOSITES PART B-ENGINEERING (2021)

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Article Chemistry, Multidisciplinary

Full-Stokes Polarization Perfect Absorption with Diatomic Metasurfaces

Yao Liang et al.

Summary: This article introduces a novel plasmonic metasurface structure in the mid-infrared range that achieves full-Stokes polarization perfect absorption, providing strong field enhancement and sharp differentiation of spectral responses for various polarization states.

NANO LETTERS (2021)

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Article Multidisciplinary Sciences

Parallel convolutional processing using an integrated photonic tensor core

J. Feldmann et al.

Summary: With the advancement of technology, the demand for fast processing of large amounts of data is increasing, making highly parallelized, fast, and scalable hardware crucial. The integration of photonics can serve as the optical analogue of an application-specific integrated circuit, enabling photonic in-memory computing and efficient computational hardware.

NATURE (2021)

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Article Optics

3D high precision laser printing of a flat nanofocalizer for subwavelength light spot array

Meiling Jiang et al.

Summary: By developing a direct laser writing technique, we demonstrated a flat nanofocalizer based on the fractional Talbot effect, which converges the light field into a uniform subwavelength light spot array. Introducing a buffer layer to improve fabrication precision allowed for accurate manipulation of phase delay, enabling the device to achieve high compression ratio and modular design capability. Our research may lead to the realization of subwavelength optical devices that can be easily integrated into existing optical systems.

OPTICS LETTERS (2021)

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Article Multidisciplinary Sciences

Structural multi-colour invisible inks with submicron 4D printing of shape memory polymers

Wang Zhang et al.

Summary: Researchers have successfully achieved high-resolution printing and shape memory effects in SMP nanostructures through 4D printing, which can be used for temperature-sensitive labels, information hiding for anti-counterfeiting, and tunable photonic devices.

NATURE COMMUNICATIONS (2021)

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Article Materials Science, Multidisciplinary

Effect of pyrolysis on microstructures made of various photoresists by two-photon polymerization: comparative study

M. I. Sharipova et al.

Summary: Two-photon laser polymerization (TPP) is a cutting-edge technology for submicron-resolution 3D printing, and pyrolysis-high-temperature annealing of polymer objects may be a promising method to modify size and chemical composition, potentially becoming a standard post-processing technique for structures created via TPP.

OPTICAL MATERIALS EXPRESS (2021)

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Article Nanoscience & Nanotechnology

Metasurface Optical Characterization Using Quadriwave Lateral Shearing Interferometry

Samira Khadir et al.

Summary: An optical metasurface is composed of scattering nanostructures and can be used to design ultrathin lenses, beam deflectors, and holograms. Improving metasurface design involves developing postcharacterization techniques, with quadriwave lateral shearing interferometry being a versatile method for achieving full optical characterization of metasurfaces.

ACS PHOTONICS (2021)

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Review Nanoscience & Nanotechnology

Polymerization mechanisms initiated by spatio-temporally confined light

Edvinas Skliutas et al.

Summary: Ultrafast laser 3D lithography based on multi-photon lithography offers precise rapid prototyping and flexible additive manufacturing options, yet there is still incomplete understanding regarding factors like spatial resolution, accuracy, fabrication throughput, repeatability, and material properties.

NANOPHOTONICS (2021)

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Article Multidisciplinary Sciences

3D printing of highly stretchable hydrogel with diverse UV curable polymers

Qi Ge et al.

Summary: This study presents a new multimaterial 3D printing approach for fabricating complex hybrid 3D structures consisting of hydrogels and UV-curable polymers, paving the way for multifunctional soft devices and machines.

SCIENCE ADVANCES (2021)

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Review Chemistry, Multidisciplinary

3D Printing and Nanotechnology: A Multiscale Alliance in Personalized Medicine

Juliana dos Santos et al.

Summary: The combination of 3D printing and nanotechnology has shown significant progress in the pharmaceutical and medical field, particularly in terms of innovation and multifunctionality of medical products. Various scientific studies have demonstrated the potential of this alliance, with breakthroughs expected in areas such as cell growth, drug delivery, and antimicrobial applications.

ADVANCED FUNCTIONAL MATERIALS (2021)

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Article Materials Science, Multidisciplinary

Two-photon lithography of subwavelength plasmonic microstructures in metal-polymer composite resin

Arun Jaiswal et al.

Summary: Two-photon lithography is a crucial tool for additive manufacturing of 2D and 3D micro/nanostructures in metal-polymer composite resins with resolutions beyond the diffraction limit. The formulation of two-photon polymerizable metal doped resin has been reported, allowing for precise fabrication of metal doped micro/nanostructures. This technique has the potential to revolutionize additive manufacturing of metal-dielectric composite structures and contribute to advancements in areas such as metaphotonics and plasmonic metamaterials.

MATERIALS LETTERS (2021)

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Article Agricultural Engineering

Influence of photoinitiator and temperature on photocross-linking kinetics of acrylated epoxidized soybean oil and properties of the resulting polymers

Migle Lebedevaite et al.

Summary: The study investigated the photocross-linking kinetics of acrylated epoxidized soybean oil, finding that the type and amount of photoinitiator had an impact on the polymer properties. The results could help integrate modified soybean oil into UV/VIS curing systems, reducing environmental impact.

INDUSTRIAL CROPS AND PRODUCTS (2021)

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Article Chemistry, Multidisciplinary

Hierarchical Colorful Structures by Three-Dimensional Printing of Inverse Opals

Hemant Kumar Raut et al.

Summary: Structural coloration is a common solution in biological systems for controlling visible light, with more complex effects achieved by incorporating additional hierarchical structures. Researchers have successfully controlled photonic structures at different length scales using direct laser writing and nanosphere assembly, producing freeform hierarchical constructions with high-intensity structural coloration in the form of inverse opals.

NANO LETTERS (2021)

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Article Chemistry, Physical

3D-printed silica with nanoscale resolution

Xiewen Wen et al.

Summary: A 3D printing technique has been developed to create high-quality pure silica nanostructures with sub-200 nm resolution and the flexible capability of rare-earth element doping. The printed SiO2 structures show strong photoluminescence at desired wavelengths, making it ideal for building integrated microphotonics. This technique has the potential for exciting applications in three-dimensional micro- and nanophotonics.

NATURE MATERIALS (2021)

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Article Optics

Two-step absorption instead of two-photon absorption in 3D nanoprinting

Vincent Hahn et al.

Summary: This study introduces a two-step absorption process using inexpensive light sources as an alternative to high-resolution fabrication by two-photon absorption with femtosecond lasers. The two-step absorption shows similar quadratic optical nonlinearity as two-photon absorption under suitable conditions, allowing for printing state-of-the-art 3D nanostructures. This work paves the way for drastic miniaturization and cost reduction of 3D laser nanoprinters while addressing issues associated with femtosecond lasers.

NATURE PHOTONICS (2021)

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Review Optics

Two-photon lithography for three-dimensional fabrication in micro/ nanoscale regime: A comprehensive review

V. Harinarayana et al.

Summary: With the introduction of femtosecond lasers in the early 1990s, ultrafast laser processing has become crucial for micro/nano machining, with Two-photon lithography (TPL) being a unique technique that has revolutionized laser material processing. This paper provides an overview of TPL, including its working principle, experimental setup, and materials, as well as techniques to improve resolution and pave the way for industrialization. The paper also thoroughly reviews TPL for microfabrication, with an emphasis on metamaterials.

OPTICS AND LASER TECHNOLOGY (2021)

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Article Physics, Multidisciplinary

Mobius Strip Microlasers: A Testbed for Non-Euclidean Photonics

Yalei Song et al.

Summary: Experiments with Mobius strip microlasers fabricated by direct laser writing show that Mobius strip cavity cannot sustain whispering gallery modes (WGM) unlike conventional ring or disk resonators. Comparison between experiments and 3D finite difference time domain (FDTD) simulations reveals that resonances are localized on periodic geodesics.

PHYSICAL REVIEW LETTERS (2021)

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Review Polymer Science

A Review of Vat Photopolymerization Technology: Materials, Applications, Challenges, and Future Trends of 3D Printing

Marek Pagac et al.

Summary: This paper reviews three photopolymerization technologies and the mechanical properties of light-curable resin materials, as well as their practical applications. It aims to inspire further research in the field of photopolymerization technology, especially in the development of new materials and mathematical models.

POLYMERS (2021)

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Article Multidisciplinary Sciences

Biomimetic apposition compound eye fabricated using microfluidic-assisted 3D printing

Bo Dai et al.

Summary: The study presents a microfluidic-assisted 3D printing technique for fabricating biomimetic compound eyes, mimicking natural eye structures and enabling various applications.

NATURE COMMUNICATIONS (2021)

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Article Multidisciplinary Sciences

Shape-programmable liquid crystal elastomer structures with arbitrary three-dimensional director fields and geometries

Yubing Guo et al.

Summary: Pre-patterning director fields into liquid crystal elastomers enables programmed morphing upon actuation, allowing for various applications in soft robotics, dynamic optics, and programmable origami and kirigami. This technology makes it possible to achieve programmable shape changes in materials, depending on their geometries and director fields.

NATURE COMMUNICATIONS (2021)

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Article Chemistry, Multidisciplinary

Leveraging on ENZ Metamaterials to Achieve 2D and 3D Hyper-Resolution in Two-Photon Direct Laser Writing

Giuseppe Emanuele Lio et al.

Summary: A novel technique has been developed to improve the resolution of two-photon direct laser writing lithography. The study shows the fabrication of ultra-thin all-dielectric metalenses and highly detailed dielectric 3D bas-relief structures.

ADVANCED MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Mechanically Robust and UV-Curable Shape-Memory Polymers for Digital Light Processing Based 4D Printing

Biao Zhang et al.

Summary: A mechanically robust and UV-curable SMP system has been developed for 4D printing, allowing the fabrication of high-resolution, highly complex 3D structures with large shape change upon heating. The developed SMP system exhibits excellent fatigue resistance and can be repeatedly loaded more than 10,000 times, significantly improving the mechanical performance of SMP-based 4D printing structures for engineering applications such as aerospace, smart furniture, and soft robots.

ADVANCED MATERIALS (2021)

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Article Physics, Applied

Birefringent optical retarders from laser 3D-printed dielectric metasurfaces

Simonas Varapnickas et al.

Summary: This study reports on the design, production, and characterization of dielectric metasurface birefringent optical retarders made from femtosecond laser 3D printing technology, with a polarization conversion efficiency more than 10 times larger than previously reported. The flexibility of the fabrication process allows for arbitrary orientation of the artificially engineered optical axis, opening up new possibilities for 3D printed geometric phase optical elements.

APPLIED PHYSICS LETTERS (2021)

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Article Optics

Rapid, continuous projection multi-photon 3D printing enabled by spatiotemporal focusing of femtosecond pulses

Paul Somers et al.

Summary: This work combines high-speed projection multiphoton printing with spatiotemporal focusing to achieve rapid, layer-by-layer fabrication of 3D structures. A numerical model for computing spatiotemporal focusing and imaging is presented and verified. Complex 3D structures with smooth features are fabricated, showcasing the potential to manufacture 3D structures with micro/nanoscale features in a practical time scale.

LIGHT-SCIENCE & APPLICATIONS (2021)

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Article Chemistry, Physical

Probing Plasmon-Induced Chemical Mechanisms by Free-Radical Nanophotopolymerization

Farid Kameche et al.

Summary: The localized surface plasmon-induced photopolymerization of free-radical acrylate monomers is an efficient method for preparing metal/polymer hybrid nanoparticles with precise control over the thickness and distribution of the polymer on the nanoparticle surface. Experimental studies have shown that the photochemical pathway may be the main mechanism, although various mechanisms involving electromagnetic hot spots, thermoplasmonic effects, and electrochemical processes have been proposed.

JOURNAL OF PHYSICAL CHEMISTRY C (2021)

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Article Multidisciplinary Sciences

Three-dimensional nanoprinting via charged aerosol jets

Wooik Jung et al.

Summary: Three-dimensional (3D) printing has revolutionized manufacturing processes in various fields. A new technique allows direct printing of metal nanostructures with flexible geometries and feature sizes down to hundreds of nanometres, using various materials.

NATURE (2021)

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Article Optics

Laser 3D Printing of Inorganic Free-Form Micro-Optics

Diana Gonzalez-Hernandez et al.

Summary: A pilot study on laser 3D printing of inorganic free-form micro-optics has been experimentally validated, demonstrating the optical performance of the produced miniature optical elements. This technology allows for the manufacturing of complex optical components and is suitable for applications in harsh conditions such as high radiation and temperature environments.

PHOTONICS (2021)

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Article Optics

Refractive index change measurement by quantitative microscopy phase imaging for femtosecond laser written structures

Alain Abou Khalil et al.

Summary: Quantitative phase imaging is an efficient technique for quantitatively and qualitatively measuring refractive index profiles spatially, but has limitations in measuring the depth for thick samples. This paper presents an approach based on the complete Rayleigh-Sommerfeld diffraction theory to quantitatively measure refractive index changes in thick samples, which is validated through experimental measurements on cylindrically shaped volume modifications inscribed in silica glass. The results enable quantitative measurement of refractive index changes in thick embedded 3D structures.

OPTICS COMMUNICATIONS (2021)

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Article Optics

3D printed hybrid refractive/diffractive achromat and apochromat for the visible wavelength range

Michael Schmid et al.

Summary: This letter demonstrates the use of 3D direct laser writing technology in creating micro-optical devices with drastically reduced chromatic aberrations by combining different photoresists. The combination of refractive and diffractive surfaces to create achromats and apochromats has been successfully shown, offering significant benefits for micro-optics.

OPTICS LETTERS (2021)

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Review Materials Science, Multidisciplinary

3D and 4D lithography of untethered microrobots

Fatemeh Rajabasadi et al.

Summary: Additive manufacturing technologies like 3D printing and two-photon polymerization have advanced micro/nano-fabrication, offering high resolution and reproducibility. Particularly in the field of medical microrobotics, the use of smart materials and complex structures presents new opportunities for innovation and research.

PROGRESS IN MATERIALS SCIENCE (2021)

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Article Polymer Science

Vegetable Oil-Based Thiol-Ene/Thiol-Epoxy Resins for Laser Direct Writing 3D Micro-/Nano-Lithography

Sigita Grauzeliene et al.

Summary: This study focuses on enhancing the performance of thermosets by combining photo- and thermal polymerization, using renewable resources instead of petroleum-based materials. By studying thiol-epoxy reactions and examining rheological properties, the most suitable formulations for laser direct writing were selected. The dual cured thermosets showed higher rigidity, tensile strength, and thermal stability, demonstrating their potential for high-resolution 3D printing.

POLYMERS (2021)

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Article Optics

Ultrahigh numerical aperture meta-fibre for flexible optical trapping

Malte Plidschun et al.

Summary: The study demonstrates the design and 3D nanoprinting of an ultrahigh numerical aperture meta-fibre for highly flexible optical trapping, achieving a diffraction-limited focal spot with a record-high numerical aperture of up to NA approximate to 0.9. This flexible and cost-effective meta-fibre device shows great potential in various fields including bioanalytics, quantum technology, and life sciences.

LIGHT-SCIENCE & APPLICATIONS (2021)

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Article Chemistry, Multidisciplinary

Optical Fireworks Based on Multifocal Three-Dimensional Color Prints

Hongtao Wang et al.

Summary: This study introduces a concept of virtual 3D color objects with colorful focal spots controlled by 3D printed microlens profiles and nanopillar heights, which can display bright colorful spots above the substrate under white light illumination. The technology has potential applications in practical anticounterfeiting labels and colorful displays integrated with nanostructures.

ACS NANO (2021)

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Review Materials Science, Multidisciplinary

Nature-inspired materials and structures using 3D Printing

Amit Bandyopadhyay et al.

Summary: The challenging task of emulating the unique combination of structural, compositional, and functional gradation found in natural materials has been facilitated by recent innovations in additive manufacturing (AM) or 3D Printing (3DP). These techniques enable the creation of structures with variations in material composition, structure, and performance, giving manufacturers an edge in designing components for highly-specialized applications in different industries.

MATERIALS SCIENCE & ENGINEERING R-REPORTS (2021)

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Article Chemistry, Multidisciplinary

Full Color and Grayscale Painting with 3D Printed Low-Index Nanopillars

Hao Wang et al.

Summary: The study reports a method for color and grayscale generation based on tuning a single nanostructure geometry, systematically investigated color generation from basic single nanopillar geometry in low-refractive-index material through two-photon polymerization lithography.

NANO LETTERS (2021)

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Article Chemistry, Multidisciplinary

Hybrid anisotropic plasmonic metasurfaces with multiple resonances of focused light beams

Yao Liang et al.

Summary: This study demonstrates multiple resonances with high absorption amplitudes by utilizing the physics of bound states in the continuum, providing novel strategies for designing photonic devices that manipulate focused light.

NANO LETTERS (2021)

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Article Engineering, Chemical

Effect of temperature on the SU-8 photoresist filling behavior during thermal nanoimprinting

Lei Sun et al.

Summary: This paper investigates the filling behavior of SU-8 photoresist during thermal nanoimprinting by analyzing the temperature-dependent rheological properties and discussing the filling behavior at different temperatures. High-precision nanochannels were successfully fabricated under optimized parameters.

POLYMER ENGINEERING AND SCIENCE (2021)

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Article Multidisciplinary Sciences

Ultralow-threshold laser using super-bound states in the continuum

Min-Soo Hwang et al.

Summary: By merging symmetry-protected and accidental bound states in the continuum, an efficient laser with significantly reduced threshold, substantially increased quality factor, and shrunken far-field images can be realized. The study provides a route for nanolasers with reduced out-of-plane losses in finite-size active nanodevices and improved lasing characteristics.

NATURE COMMUNICATIONS (2021)

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Article Multidisciplinary Sciences

High-resolution light field prints by nanoscale 3D printing

John You En Chan et al.

Summary: Light field prints displaying 3D information often appear pixelated due to limited resolution and misalignment between lenses and color pixels. Here, the authors present a one-step process via two-photon polymerization lithography to fabricate light field prints with high spatial and angular resolution.

NATURE COMMUNICATIONS (2021)

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Review Chemistry, Physical

Review on Experimental and Theoretical Investigations of Ultra-Short Pulsed Laser Ablation of Metals with Burst Pulses

Daniel J. Foerster et al.

Summary: The use of ultra-short double pulses for laser processing has been attracting attention since the early 2000s. Over the past decade, pulse bursts consisting of multiple pulses with delays of several tens of nanoseconds have entered the field of micromachining of metals, opening up new process regimes and improving the structuring rates and surface quality of machined samples. Various physical effects have led to a new understanding of machining strategies and processing regimes, with experimental and numerical investigations placing results in context for different time scales during laser processing.

MATERIALS (2021)

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Article Materials Science, Multidisciplinary

Refractive index and dispersion of transparent 3D printing photoresins

Mateo Reynoso et al.

Summary: This study measured the refractive index of commonly used 3D printing photosensitive resins for the first time, revealing a range of 1.505-1.533 across the visible spectrum. The Abbe number also varied between 44.4 - 67.8.

OPTICAL MATERIALS EXPRESS (2021)

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Article Polymer Science

Two-Photon Polymerization: Functionalized Microstructures, Micro-Resonators, and Bio-Scaffolds

Adriano J. G. Otuka et al.

Summary: Direct laser writing technique based on two-photon polymerization (TPP) has significantly evolved over the past two decades, offering capabilities in 3D, sub-diffraction resolution, material flexibility, and gentle processing conditions. Its applications in photonics and biosciences include fabrication of functionalized microstructures, whispering gallery mode (WGM) microresonators, and microenvironments for culturing microorganisms. Key physical-chemical fundamentals, typical experimental setups, and different materials employed for TPP are also described in this review.

POLYMERS (2021)

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Article Nanoscience & Nanotechnology

High laser induced damage threshold photoresists for nano-imprint and 3D multi-photon lithography

Elmina Kabouraki et al.

Summary: A series of organic-inorganic hybrid photoresists with enhanced laser-induced damage threshold have been developed for the fabrication of micro-optical elements. These photoresists are suitable for three-dimensional multiphoton lithography and nanoimprint lithography, showing potential for future mass production of MOEs.

NANOPHOTONICS (2021)

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Review Nanoscience & Nanotechnology

3D Printing of Multilayered and Multimaterial Electronics: A Review

Guo Liang Goh et al.

Summary: 3D printing, also known as additive manufacturing, has been utilized in electronics manufacturing for the fabrication of various electronic components and devices. There is ongoing research on 3D printing of multilayered and multimaterial electronics, but a comprehensive review on the design and fabrication consideration is yet to be done.

ADVANCED ELECTRONIC MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Neuron-Inspired Steiner Tree Networks for 3D Low-Density Metastructures

Haoyi Yu et al.

Summary: The article discusses the importance of three-dimensional micro-and nanostructures in areas such as topological photonics, and introduces a method of creating low-density metamaterials by incorporating biomimetic geometries into metastructure design. It also describes the application of the Steiner tree method and two-photon nanolithography to achieve neuron-inspired 3D structures. Additionally, two solutions to the 3D Steiner tree problem are presented, along with predictions of topological nontrivial features in T-STNs.

ADVANCED SCIENCE (2021)

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Article Optics

Direct (3+1)D laser writing of graded-index optical elements

Xavier Porte et al.

Summary: The study introduces a single-step additive fabrication method for graded-index optical elements, demonstrating a rapid manufacturing process using a commercial printer and photoresist, which can be applied for various optical devices.

OPTICA (2021)

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Article Optics

Topological photonics in 3D micro-printed systems

Julian Schulz et al.

Summary: Topological materials have been a focus of research in various fields of physics, with photonic systems serving as ideal test beds for topological models. Recent progress in 3D printing has enabled a range of implementations of topological systems.

APL PHOTONICS (2021)

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Article Nanoscience & Nanotechnology

Topological Photonics on a Small Scale

Dmitry V. Zhirihin et al.

Summary: The study discusses the physics and realization of topological photonics on small scales, focusing on recent experimental demonstrations of small-scale topological states based on arrays of resonant nanoparticles. Special attention is given to the progress on topological polaritonic structures and the future directions of nanoscale topological photonics.

SMALL SCIENCE (2021)

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Article Materials Science, Multidisciplinary

Direct laser writing of vapour-responsive photonic arrays

Colm Delaney et al.

Summary: Arrays of optically responsive ionogel structures were fabricated using direct laser writing, showing visible color changes in the presence of different solvent vapours to demonstrate their responsive nature. This represents a new departure in photonic structural colouration, with the fabricating structure exhibiting programmable, controllable, and dynamic stimuli response.

JOURNAL OF MATERIALS CHEMISTRY C (2021)

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Article Optics

Tight-binding model in optical waveguides: Design principle and transferability for simulation of complex photonics networks

Yang Chen et al.

Summary: This study explores the wide application of integrated optical waveguides based on the tight-binding model in quantum simulation, allowing for simulation of various phenomena by adjusting the coupling between waveguides. Results from simulations and experiments demonstrate the effectiveness of this method in describing the physics of one- or two-dimensional large lattice systems. Additionally, some applications and the practicality of this approach are discussed.

PHYSICAL REVIEW A (2021)

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Review Automation & Control Systems

Light-Powered Microrobots: Challenges and Opportunities for Hard and Soft Responsive Microswimmers

Ada-Ioana Bunea et al.

Summary: Global research in microrobotics has thrived in the past two decades, with a focus on light-driven microrobots. Despite facing challenges, potential solutions are being explored to facilitate their translation into real-world applications.

ADVANCED INTELLIGENT SYSTEMS (2021)

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Review Automation & Control Systems

4D Printing: Enabling Technology for Microrobotics Applications

Georges Adam et al.

Summary: 4D printing is a key technology for significant advances in microrobotics, offering higher versatility, more sophisticated designs, and a wide range of sensing and actuation possibilities. This review highlights how soft and smart materials directly printed in 3D are well suited for microrobotics requirements, and discusses advanced microrobotics requirements, fabrication methods, recent advances, and emerging opportunities in the field.

ADVANCED INTELLIGENT SYSTEMS (2021)

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Review Chemistry, Multidisciplinary

Recent advances in 3D printing of nanocellulose: structure, preparation, and application prospects

Liang Ying Ee et al.

Summary: Recently, cellulose nanomaterials extracted from agricultural biomasses have attracted attention due to declining fossil resources. Additive manufacturing techniques for new nanocellulosic materials have been developed to reduce carbon footprints and waste valuable resources. The studies on functional nanocellulosic materials with high surface area, biocompatibility, and ease of functionalization have facilitated a deeper understanding of their desirable attributes. Future applications of 3D-printed nanocellulose in biomedical, electronics, and environmental fields show optimistic technical prospects.

NANOSCALE ADVANCES (2021)

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Review Chemistry, Multidisciplinary

3D printing of functional microrobots

Jinhua Li et al.

Summary: 3D printing technology converts virtual 3D models into tangible objects, attracting researchers' interest and showing potential in various industrial sectors. Customized design of functional microrobots using 3D printing technology holds promise in the field of microrobotics.

CHEMICAL SOCIETY REVIEWS (2021)

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Article Chemistry, Multidisciplinary

Controlled Microstructural Architectures Based on Smart Fabrication Strategies

Haibo Ding et al.

ADVANCED FUNCTIONAL MATERIALS (2020)

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Article Materials Science, Multidisciplinary

Four-dimensional direct laser writing of reconfigurable compound micromachines

Dongdong Jin et al.

MATERIALS TODAY (2020)

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Review Chemistry, Multidisciplinary

Thermal Transport in 3D Nanostructures

Haifei Zhan et al.

ADVANCED FUNCTIONAL MATERIALS (2020)

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Review Chemistry, Multidisciplinary

Design, Fabrication, and Mechanics of 3D Micro-/Nanolattices

Xuan Zhang et al.

SMALL (2020)

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Article Polymer Science

Photocross-linked polymers based on plant-derived monomers for potential application in optical 3D printing

Migle Lebedevaite et al.

JOURNAL OF APPLIED POLYMER SCIENCE (2020)

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Article Chemistry, Physical

Three-dimensional printing of multicomponent glasses using phase-separating resins

David G. Moore et al.

NATURE MATERIALS (2020)

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Article Nanoscience & Nanotechnology

Highly Efficient Dual-Fiber Optical Trapping with 3D Printed Diffractive Fresnel Lenses

Asa Asadollahbaik et al.

ACS PHOTONICS (2020)

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Article Materials Science, Multidisciplinary

Additive manufacturing by template-assisted 3D electrodeposition: Nanocrystalline nickel microsprings and microspring arrays

Patrik Schurch et al.

APPLIED MATERIALS TODAY (2020)

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Article Nanoscience & Nanotechnology

4D Printing of a Light-Driven Soft Actuator with Programmed Printing Density

Akihiro Nishiguchi et al.

ACS APPLIED MATERIALS & INTERFACES (2020)

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Article Chemistry, Multidisciplinary

Magnetic Shape Memory Polymers with Integrated Multifunctional Shape Manipulation

Qiji Ze et al.

ADVANCED MATERIALS (2020)

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Review Chemistry, Multidisciplinary

Nanomaterial Patterning in 3D Printing

Brian Elder et al.

ADVANCED MATERIALS (2020)

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Review Chemistry, Multidisciplinary

Designing with Light: Advanced 2D, 3D, and 4D Materials

Kenward Jung et al.

ADVANCED MATERIALS (2020)

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Article Polymer Science

Smart Origination and Functional Replication: Thermal Reflow and Innovative 3D Structures

Robert Kirchner et al.

JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY (2020)

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Article Optics

Orbital angular momentum holography for high-security encryption

Xinyuan Fang et al.

NATURE PHOTONICS (2020)

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Article Optics

Flat optics for image differentiation

You Zhou et al.

NATURE PHOTONICS (2020)

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Article Optics

3D holographic light shaping for advanced multiphoton polymerization

Maria Manousidaki et al.

OPTICS LETTERS (2020)

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Article Optics

Optical damage thresholds of microstructures made by laser three-dimensional nanolithography

Agne Butkute et al.

OPTICS LETTERS (2020)

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Article Multidisciplinary Sciences

Subwavelength dielectric resonators for nonlinear nanophotonics

Kirill Koshelev et al.

SCIENCE (2020)

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Article Chemistry, Multidisciplinary

3D-Printed Scanning-Probe Microscopes with Integrated Optical Actuation and Read-Out

Philipp-Immanuel Dietrich et al.

SMALL (2020)

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Article Multidisciplinary Sciences

High-resolution tomographic volumetric additive manufacturing

Damien Loterie et al.

NATURE COMMUNICATIONS (2020)

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Article Optics

Coherent remote control of quantum emitters embedded in polymer waveguides

Alexander Landowski et al.

APL PHOTONICS (2020)

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Article Chemistry, Multidisciplinary

Stimuli-Responsive Actuator Fabricated by Dynamic Asymmetric Femtosecond Bessel Beam for In Situ Particle and Cell Manipulation

Rui Li et al.

ACS NANO (2020)

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Review Chemistry, Multidisciplinary

A Review of 3D Printing Technologies for Soft Polymer Materials

Lu-Yu Zhou et al.

ADVANCED FUNCTIONAL MATERIALS (2020)

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Article Chemistry, Multidisciplinary

3D Printing of Micrometer-Sized Transparent Ceramics with On-Demand Optical-Gain Properties

Ido Cooperstein et al.

ADVANCED MATERIALS (2020)

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Article Materials Science, Multidisciplinary

Self-Powered Humidity Sensor Using Chitosan-Based Plasmonic Metal-Hydrogel-Metal Filters

Jaehyuck Jang et al.

ADVANCED OPTICAL MATERIALS (2020)

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Letter Optics

Biologically inspired ultrathin arrayed camera for high-contrast and high-resolution imaging

Kisoo Kim et al.

LIGHT-SCIENCE & APPLICATIONS (2020)

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Review Chemistry, Analytical

Focused Electron Beam-Based 3D Nanoprinting for Scanning Probe Microscopy: A Review

Harald Plank et al.

MICROMACHINES (2020)

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Article Chemistry, Analytical

Rapid Fabrication of Continuous Surface Fresnel Microlens Array by Femtosecond Laser Focal Field Engineering

Linyu Yan et al.

MICROMACHINES (2020)

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Article Materials Science, Biomaterials

Three-Dimensional Printing of Pure Proteinaceous Microstructures by Femtosecond Laser Multiphoton Cross-Linking

Daniela Serien et al.

ACS BIOMATERIALS SCIENCE & ENGINEERING (2020)

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Article Nanoscience & Nanotechnology

Launching a new dimension with 3D magnetic nanostructures

Peter Fischer et al.

APL MATERIALS (2020)

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Article Multidisciplinary Sciences

3D printing of conducting polymers

Hyunwoo Yuk et al.

NATURE COMMUNICATIONS (2020)

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Article Multidisciplinary Sciences

Single-step manufacturing of hierarchical dielectric metalens in the visible

Gwanho Yoon et al.

NATURE COMMUNICATIONS (2020)

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Article Multidisciplinary Sciences

Multi-beam two-photon polymerization for fast large area 3D periodic structure fabrication for bioapplications

Christian Maibohm et al.

SCIENTIFIC REPORTS (2020)

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Article Materials Science, Multidisciplinary

Microscale Polarization Color Pixels from Liquid Crystal Elastomers

Yubing Guo et al.

ADVANCED OPTICAL MATERIALS (2020)

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Review Optics

Kirigami/origami: unfolding the new regime of advanced 3D microfabrication/nanofabrication with folding

Shanshan Chen et al.

LIGHT-SCIENCE & APPLICATIONS (2020)

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Article Optics

O-FIB: far-field-induced near-field breakdown for direct nanowriting in an atmospheric environment

Zhen-Ze Li et al.

LIGHT-SCIENCE & APPLICATIONS (2020)

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Article Optics

Hybrid multi-chip assembly of optical communication engines by in situ 3D nano-lithography

Matthias Blaicher et al.

LIGHT-SCIENCE & APPLICATIONS (2020)

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Review Materials Science, Multidisciplinary

3D printing of hydrogels: Rational design strategies and emerging biomedical applications

Jinhua Li et al.

MATERIALS SCIENCE & ENGINEERING R-REPORTS (2020)

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Article Chemistry, Multidisciplinary

Additive Manufacturing of High-Refractive-Index, Nanoarchitected Titanium Dioxide for 3D Dielectric Photonic Crystals

Andrey Vyatskikh et al.

NANO LETTERS (2020)

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Article Chemistry, Multidisciplinary

Bound States in the Continuum in Anisotropic Plasmonic Metasurfaces

Yao Liang et al.

NANO LETTERS (2020)

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Article Optics

Optical tentacle of suspended polymer micro-rings on a multicore fiber facet for vapor sensing

Qiaoqiao Liu et al.

OPTICS EXPRESS (2020)

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Article Chemistry, Multidisciplinary

3D-Printed Quantum Dot Nanopixels

Jongcheon Bae et al.

ACS NANO (2020)

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Article Chemistry, Multidisciplinary

Direct Laser Writing of Four-Dimensional Structural Color Microactuators Using a Photonic Photoresist

Marc del Pozo et al.

ACS NANO (2020)

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Article Chemistry, Multidisciplinary

Toward Near-Perfect Diffractive Optical Elements via Nanoscale 3D Printing

Hao Wang et al.

ACS NANO (2020)

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Article Chemistry, Multidisciplinary

3D Microstructures of Liquid Crystal Networks with Programmed Voxelated Director Fields

Yubing Guo et al.

ADVANCED MATERIALS (2020)

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Article Chemistry, Multidisciplinary

3D Two-Photon Microprinting of Nanoporous Architectures

Frederik Mayer et al.

ADVANCED MATERIALS (2020)

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Article Materials Science, Multidisciplinary

High-Resolution 3D Printed Photonic Waveguide Devices

Hongwei Gao et al.

ADVANCED OPTICAL MATERIALS (2020)

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Article Optics

Ultrathin monolithic 3D printed optical coherence tomography endoscopy for preclinical and clinical use

Jiawen Li et al.

LIGHT-SCIENCE & APPLICATIONS (2020)

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Review Optics

Recent advances in 2D, 3D and higher-order topological photonics

Minkyung Kim et al.

LIGHT-SCIENCE & APPLICATIONS (2020)

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Article Materials Science, Multidisciplinary

A material odyssey for 3D nano/microstructures: two photon polymerization based nanolithography in bioapplications

Caizhi Liao et al.

APPLIED MATERIALS TODAY (2020)

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Article Chemistry, Physical

Super-Resolution Imaging with Direct Laser Writing-Printed Microstructures

Bintao Du et al.

JOURNAL OF PHYSICAL CHEMISTRY A (2020)

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Article Materials Science, Multidisciplinary

Plasmon-triggered living photopolymerization for elaboration of hybrid polymer/metal nanoparticles

Farid Kameche et al.

MATERIALS TODAY (2020)

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Article Materials Science, Multidisciplinary

Smart polymers and nanocomposites for 3D and 4D printing

Mojtaba Falahati et al.

MATERIALS TODAY (2020)

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Article Chemistry, Multidisciplinary

Quasi-BIC Resonant Enhancement of Second-Harmonic Generation in WS2 Monolayers

Nils Bernhardt et al.

NANO LETTERS (2020)

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Article Optics

Thermal post-curing as an efficient strategy to eliminate process parameter sensitivity in the mechanical properties of two-photon polymerized materials

Jens Bauer et al.

OPTICS EXPRESS (2020)

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Article Multidisciplinary Sciences

Quadrupole topological photonic crystals

Li He et al.

NATURE COMMUNICATIONS (2020)

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Article Multidisciplinary Sciences

A hybrid achromatic metalens

F. Balli et al.

NATURE COMMUNICATIONS (2020)

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Article Multidisciplinary Sciences

Voxels Optimization in 3D Laser Nanoprinting

Yahya Bougdid et al.

SCIENTIFIC REPORTS (2020)

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Article Polymer Science

Polymerization Photoinitiators with Near-Resonance Enhanced Two-Photon Absorption Cross-Section: Toward High-Resolution Photoresist with Improved Sensitivity

Caroline Arnoux et al.

MACROMOLECULES (2020)

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Article Materials Science, Multidisciplinary

Shape morphing smart 3D actuator materials for micro soft robot

Hyun Kim et al.

MATERIALS TODAY (2020)

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Article Optics

3D-printed optical probes for wafer-level testing of photonic integrated circuits

Mareike Trappen et al.

OPTICS EXPRESS (2020)

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Article Multidisciplinary Sciences

Femtosecond laser programmed artificial musculoskeletal systems

Zhuo-Chen Ma et al.

NATURE COMMUNICATIONS (2020)

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Article Materials Science, Multidisciplinary

Stitching-free 3D printing of millimeter-sized highly transparent spherical and aspherical optical components

Simon Ristok et al.

OPTICAL MATERIALS EXPRESS (2020)

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Article Materials Science, Multidisciplinary

Direct laser writing of a titanium dioxide-laden retinal cone phantom for adaptive optics-optical coherence tomography

Andrew C. Lamont et al.

OPTICAL MATERIALS EXPRESS (2020)

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Article Polymer Science

Fabrication of Sub-Micron Polymer Waveguides through Two-Photon Polymerization in Polydimethylsiloxane

Giulia Panusa et al.

POLYMERS (2020)

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Review Materials Science, Multidisciplinary

Sensitive Photoresists for Rapid Multiphoton 3D Laser Micro- and Nanoprinting

Pascal Kiefer et al.

ADVANCED OPTICAL MATERIALS (2020)

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Article Optics

Artificial gauge field switching using orbital angular momentum modes in optical waveguides

Christina Joerg et al.

LIGHT-SCIENCE & APPLICATIONS (2020)

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Article Optics

Miniscope3D: optimized single-shot miniature 3D fluorescence microscopy

Kyrollos Yanny et al.

LIGHT-SCIENCE & APPLICATIONS (2020)

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Article Optics

3D printed waveguides based on photonic crystal fiber designs for complex fiber-end photonic devices

Andrea Bertoncini et al.

OPTICA (2020)

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Article Materials Science, Multidisciplinary

Effect of high strain rates and temperature on the micromechanical properties of 3D-printed polymer structures made by two-photon lithography

Nadia Rohbeck et al.

MATERIALS & DESIGN (2020)

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Article Multidisciplinary Sciences

Mechanical stimulation of single cells by reversible host-guest interactions in 3D microscaffolds

Marc Hippler et al.

SCIENCE ADVANCES (2020)

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Article Nanoscience & Nanotechnology

Multistimuli-Responsive Optical Hydrogel Nanomembranes to Construct Planar Color Display Boards for Detecting Local Environmental Changes

Muhammad Umar et al.

ACS APPLIED MATERIALS & INTERFACES (2020)

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Article Multidisciplinary Sciences

Xolography for linear volumetric 3D printing

Martin Regehly et al.

NATURE (2020)

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Article Optics

3D nanoprinted kinoform spiral zone plates on fiber facets for high-efficiency focused vortex beam generation

Jian Yu et al.

OPTICS EXPRESS (2020)

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Article Physics, Multidisciplinary

Observation of a Charge-2 Photonic Weyl Point in the Infrared

Sachin Vaidya et al.

PHYSICAL REVIEW LETTERS (2020)

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Article Optics

Generalized laws of refraction and reflection at interfaces between different photonic artificial gauge fields

Moshe-Ishay Cohen et al.

LIGHT-SCIENCE & APPLICATIONS (2020)

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Article Optics

Direct laser writing of volumetric gradient index lenses and waveguides

Christian R. Ocier et al.

LIGHT-SCIENCE & APPLICATIONS (2020)

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Article Engineering, Manufacturing

Automated detection of part quality during two-photon lithography via deep learning

Xian Yeow Lee et al.

ADDITIVE MANUFACTURING (2020)

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Article Materials Science, Multidisciplinary

Aspherical microlenses enabled by two-photon direct laser writing for fiber-optical microendoscopy

Baokai Wang et al.

OPTICAL MATERIALS EXPRESS (2020)

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Article Physics, Applied

Dynamic mechanical characterization of two-photon-polymerized SZ2080 photoresist

L. Pertoldi et al.

JOURNAL OF APPLIED PHYSICS (2020)

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Review Materials Science, Multidisciplinary

Optical Fiber Integrated Functional Micro-/Nanostructure Induced by Two-Photon Polymerization

Cong Xiong et al.

FRONTIERS IN MATERIALS (2020)

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Article Materials Science, Multidisciplinary

Associative Learning by Classical Conditioning in Liquid Crystal Network Actuators

Hao Zeng et al.

MATTER (2020)

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Article Materials Science, Multidisciplinary

Direct Laser Writing to Generate Molds for Polymer Nanopillar Replication

Colm Delaney et al.

ACS APPLIED POLYMER MATERIALS (2020)

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Article Chemistry, Multidisciplinary

SERS using two-photon polymerized nanostructures for mycotoxin detection

Qing Liu et al.

RSC ADVANCES (2020)

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Review Engineering, Electrical & Electronic

Topological photonic crystals: a review

Hongfei Wang et al.

FRONTIERS OF OPTOELECTRONICS (2020)

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Review Chemistry, Multidisciplinary

3D printing of bioinspired textured surfaces with superamphiphobicity

Changyou Yan et al.

NANOSCALE (2020)

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Review Nanoscience & Nanotechnology

3D and 4D printing for optics and metaphotonics

Hoon Yeub Jeong et al.

NANOPHOTONICS (2020)

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Review Engineering, Electrical & Electronic

Thermal reflow of polymers for innovative and smart 3D structures: A review

Robert Kirchner et al.

MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING (2019)

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Article Engineering, Electrical & Electronic

Femtosecond Laser Microprinting of a Fiber Whispering Gallery Mode Resonator for Highly-Sensitive Temperature Measurements

Zhengyong Li et al.

JOURNAL OF LIGHTWAVE TECHNOLOGY (2019)

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Article Multidisciplinary Sciences

Colouration by total internal reflection and interference at microscale concave interfaces

Amy E. Goodling et al.

NATURE (2019)

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Article Optics

Photonic-chip-on-tip: compound photonic devices fabricated on optical fibers

K. Markiewicz et al.

OPTICS EXPRESS (2019)

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Review Physics, Multidisciplinary

Topological photonics

Tomoki Ozawa et al.

REVIEWS OF MODERN PHYSICS (2019)

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Review Materials Science, Multidisciplinary

3D Printed Photoresponsive Materials for Photonics

Sara Nocentini et al.

ADVANCED OPTICAL MATERIALS (2019)

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Article Multidisciplinary Sciences

Multimaterial 3D laser microprinting using an integrated microfluidic system

Frederik Mayer et al.

SCIENCE ADVANCES (2019)

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Article Nanoscience & Nanotechnology

Development of Direct-Laser-Printable Light-Powered Nanocomposites

Ling Chen et al.

ACS APPLIED MATERIALS & INTERFACES (2019)

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Article Materials Science, Multidisciplinary

Adaptive optics aberration correction for deep direct laser written waveguides in the heating regime

N. Bisch et al.

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING (2019)

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Article Nanoscience & Nanotechnology

Nanofabrication of High-Resolution Periodic Structures with a Gap Size Below 100 nm by Two-Photon Polymerization

Lei Zheng et al.

NANOSCALE RESEARCH LETTERS (2019)

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Article Optics

Ultrasensitive hyperspectral imaging and biodetection enabled by dielectric metasurfaces

Filiz Yesilkoy et al.

NATURE PHOTONICS (2019)

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Article Optics

Novel liquid crystal photonic devices enabled by two-photon polymerization [Invited]

Ziqian He et al.

OPTICS EXPRESS (2019)

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Article Optics

Mesoscale laser 3D printing

Linas Jonusauskas et al.

OPTICS EXPRESS (2019)

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Article Nanoscience & Nanotechnology

Nanoscale optical and structural characterisation of silk

Meguya Ryu et al.

BEILSTEIN JOURNAL OF NANOTECHNOLOGY (2019)

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Article Materials Science, Multidisciplinary

Custom-made optical scatterers produced by 3D direct laser writing

Felix Gloeckler et al.

OPTICAL MATERIALS EXPRESS (2019)

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Article Materials Science, Multidisciplinary

Effect of the resin viscosity on the writing properties of two-photon polymerization

T. Zandrini et al.

OPTICAL MATERIALS EXPRESS (2019)

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Article Materials Science, Multidisciplinary

Biomimetic structural coloration with tunable degree of angle-independence generated by two-photon polymerization

Gordon Zyla et al.

OPTICAL MATERIALS EXPRESS (2019)

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Article Materials Science, Multidisciplinary

Off-Axis Holography with Uniform Illumination via 3D Printed Diffractive Optical Elements

Hao Wang et al.

ADVANCED OPTICAL MATERIALS (2019)

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Article Nanoscience & Nanotechnology

Observation of Complete Photonic Bandgap in Low Refractive Index Contrast Inverse Rod-Connected Diamond Structured Chalcogenides

Lifeng Chen et al.

ACS PHOTONICS (2019)

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Review Chemistry, Multidisciplinary

Current Biomedical Applications of 3D Printing and Additive Manufacturing

Pouyan Ahangar et al.

APPLIED SCIENCES-BASEL (2019)

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Article Nanoscience & Nanotechnology

Ultrastable, Deformable, and Stretchable Luminescent Organic-Inorganic Perovskite Nanocrystal-Polymer Composites for 3D Printing and White Light-Emitting Diodes

Ching-Lan Tai et al.

ACS APPLIED MATERIALS & INTERFACES (2019)

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Article Materials Science, Multidisciplinary

High-Speed Direct Laser Writing of Silver Nanostructures via Two-Photon Reduction

Sourabh K. Saha et al.

ADVANCED ENGINEERING MATERIALS (2019)

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Article Chemistry, Multidisciplinary

Smart Compound Eyes Enable Tunable Imaging

Zhuo-Chen Ma et al.

ADVANCED FUNCTIONAL MATERIALS (2019)

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Article Chemistry, Multidisciplinary

Additive Manufacturing of 3D-Architected Multifunctional Metal Oxides

Daryl W. Yee et al.

ADVANCED MATERIALS (2019)

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Article Physics, Applied

3D nanoprinting via focused electron beams

R. Winkler et al.

JOURNAL OF APPLIED PHYSICS (2019)

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Article Optics

Experimental realization of a Weyl exceptional ring

Alexander Cerjan et al.

NATURE PHOTONICS (2019)

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Article Optics

Photonic-integrated circuits with non-planar topologies realized by 3D-printed waveguide overpasses

Aleksandar Nesic et al.

OPTICS EXPRESS (2019)

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Article Multidisciplinary Sciences

Ultrafast multi-focus 3-D nano-fabrication based on two-photon polymerization

Qiang Geng et al.

NATURE COMMUNICATIONS (2019)

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Article Multidisciplinary Sciences

Metasurface orbital angular momentum holography

Haoran Ren et al.

NATURE COMMUNICATIONS (2019)

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Article Optics

Limits of topological protection under local periodic driving

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OPTICS LETTERS (2019)

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PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA (2019)

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NANOSCALE (2019)

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NANOSCALE ADVANCES (2019)

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Precise assembly and joining of silver nanowires in three dimensions for highly conductive composite structures

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INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING (2019)

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Micro-scale fiber-optic force sensor fabricated using direct laser writing and calibrated using machine learning

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Three-dimensional direct laser writing of biomimetic neuron structures

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OPTICS LETTERS (2018)

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NANO FUTURES (2018)

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Radiopaque Resists for Two-Photon Lithography To Enable Submicron 3D Imaging of Polymer Parts via X-ray Computed Tomography

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Size- and Wavelength-Dependent Two-Photon Absorption Cross-Section of CsPbBr3 Perovskite Quantum Dots

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Experimental observation of optical Weyl points and Fermi arc-like surface states

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Label-free detection of bovine serum albumin based on an in-fiber Mach-Zehnder interferometric biosensor

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OPTICS EXPRESS (2017)

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High sensitivity fiber acoustic sensor tip working at 1550 nm fabricated by two-photon polymerization technique

Min Li et al.

SENSORS AND ACTUATORS A-PHYSICAL (2017)

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Multiphoton Direct Laser Writing and 3D Imaging of Polymeric Freestanding Architectures for Cell Colonization

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Experimental observation of anomalous topological edge modes in a slowly driven photonic lattice

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NATURE COMMUNICATIONS (2017)

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Infrared dielectric response of nanoscribe IP-dip and IP-L monomers after polymerization from 250 cm-1 to 6000 cm-1

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Refractive index measurements of photoresists for three-dimensional direct laser writing

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OPTICAL MATERIALS EXPRESS (2017)

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Generation of 3-dimensional polymer structures in liquid crystalline devices using direct laser writing

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A method for positioning the focal spot location of two photon polymerization

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Plasmonic nano-printing: large-area nanoscale energy deposition for efficient surface texturing

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LIGHT-SCIENCE & APPLICATIONS (2017)

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MICROMACHINES (2017)

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Light-Directed Tuning of Plasmon Resonances via Plasmon-Induced Polymerization Using Hot Electrons

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Miniature wide-spectrum mode sorter for vortex beams produced by 3D laser printing

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OPTICA (2017)

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SCIENCE ADVANCES (2017)

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Selective Surface Smoothening of Polymer Microlenses by Depth Confined Softening

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Direct laser writing of a new type of waveguides in silver containing glasses

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SCIENTIFIC REPORTS (2017)

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Generation of bioinspired structural colors via two-photon polymerization

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SCIENTIFIC REPORTS (2017)

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Additive manufacture of complex 3D Au-containing nanocomposites by simultaneous two-photon polymerisation and photoreduction

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SCIENTIFIC REPORTS (2017)

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Optically Clear and Resilient Free-Form μ-Optics 3D-Printed via Ultrafast Laser Lithography

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MATERIALS (2017)

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Tunable multilayer submicrostructures fabricated by interference assisted two-photon polymerization

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APPLIED PHYSICS LETTERS (2017)

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Direct Laser Writing of Low-Density Interdigitated Foams for Plasma Drive Shaping

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Photonic Microhand with Autonomous Action

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PHYSICAL REVIEW A (2017)

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Effect of Proximity of Features on the Damage Threshold During Submicron Additive Manufacturing Via Two-Photon Polymerization

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JOURNAL OF MICRO AND NANO-MANUFACTURING (2017)

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CHEMICAL REVIEWS (2017)

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Topological photonics: From crystals to particles

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PHYSICAL REVIEW B (2017)

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Direct laser writing of complex microtubes using femtosecond vortex beams

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APPLIED PHYSICS LETTERS (2017)

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3D printing of polymer matrix composites: A review and prospective

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COMPOSITES PART B-ENGINEERING (2017)

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Surface-modified complex SU-8 microstructures for indirect optical manipulation of single cells

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BIOMEDICAL OPTICS EXPRESS (2016)

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Tuning the Refractive Index in Gyroid Photonic Crystals via Lead-Chalcogenide Nanocrystal Coating

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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING (2016)

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Highly uniform parallel microfabrication using a large numerical aperture system

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APPLIED PHYSICS LETTERS (2016)

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3D-printing technologies for electrochemical applications

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Direct Writing Target Structures by Two-Photon Polymerization

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Hybrid Refractive-Diffractive Optical Vortex Microlens

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IEEE PHOTONICS TECHNOLOGY LETTERS (2016)

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Estimation of line dimensions in 3D direct laser writing lithography

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JOURNAL OF MICROMECHANICS AND MICROENGINEERING (2016)

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NANOTECHNOLOGY (2016)

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Two-photon direct laser writing of ultracompact multi-lens objectives (vol 7, 11763, 2016)

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Laser-writing inside uniaxially birefringent crystals: fine morphology of ultrashort pulse-induced changes in lithium niobate

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Spatial beam intensity shaping using phase masks on single-mode optical fibers fabricated by femtosecond direct laser writing

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SCIENTIFIC REPORTS (2016)

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Proceedings Paper Optics

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Two-photon direct laser writing of ultracompact multi-lens objectives

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IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS (2015)

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IEEE PHOTONICS TECHNOLOGY LETTERS (2015)

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Simultaneous Refractive Index and Temperature Measurement With LPFG and Liquid-Filled PCF

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Effect of the photoinitiator presence and exposure conditions on laser-induced damage threshold of ORMOSIL (SZ2080)

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Parallel direct laser writing of micro-optical and photonic structures using spatial light modulator

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Scheme for Achieving a Topological Photonic Crystal by Using Dielectric Material

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Multifocal optical nanoscopy for big data recording at 30 TB capacity and gigabits/second data rate

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Preclinical study of SZ2080 material 3D microstructured scaffolds for cartilage tissue engineering made by femtosecond direct laser writing lithography

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Two-photon polymerization of a three dimensional structure using beams with orbital angular momentum

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LASER & PHOTONICS REVIEWS (2014)

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Adaptive optics enhanced direct laser writing of high refractive index gyroid photonic crystals in chalcogenide glass

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Direct laser writing of random Au nanoparticle three-dimensional structures for highly reproducible micro-SERS measurements

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APPLIED PHYSICS REVIEWS (2014)

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High-Q asymmetric polymer microcavities directly fabricated by two-photon polymerization

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Group theory of circular-polarization effects in chiral photonic crystals with four-fold rotation axes applied to the eight-fold intergrowth of gyroid nets

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Simultaneous compensation for aberration and axial elongation in three-dimensional laser nanofabrication by a high numerical-aperture objective

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Multi foci with diffraction limited resolution

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OPTICS EXPRESS (2013)

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High-aspect 3D two-photon polymerization structuring with widened objective working range (WOW-2PP)

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Closely packed hexagonal conical microlens array fabricated by direct laser photopolymerization

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APPLIED OPTICS (2012)

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Single-pulse multiphoton fabrication of high aspect ratio structures with sub-micron features using vortex beams

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BIOMACROMOLECULES (2012)

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JOURNAL OF LASER APPLICATIONS (2012)

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Graphene-doped photo-patternable ionogels: tuning of conductivity and mechanical stability of 3D microstructures

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JOURNAL OF MATERIALS CHEMISTRY (2012)

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3D microoptical elements formed in a photostructurable germanium silicate by direct laser writing

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OPTICS AND LASERS IN ENGINEERING (2012)

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Adaptive optics enables 3D STED microscopy in aberrating specimens

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OPTICS EXPRESS (2012)

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Active aberration- and point-spread-function control in direct laser writing

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OPTICS EXPRESS (2012)

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Two-photon polymerization with variable repetition rate bursts of femtosecond laser pulses

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OPTICS EXPRESS (2012)

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High-throughput rear-surface drilling of microchannels in glass based on electron dynamics control using femtosecond pulse trains

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OPTICS LETTERS (2012)

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Adaptive slit beam shaping for direct laser written waveguides

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OPTICS LETTERS (2012)

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Two-photon polymerization technique with sub-50 nm resolution by sub-10 fs laser pulses

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OPTICAL MATERIALS EXPRESS (2012)

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Simultaneous additive and subtractive three-dimensional nanofabrication using integrated two-photon polymerization and multiphoton ablation

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LIGHT-SCIENCE & APPLICATIONS (2012)

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Subwavelength Direct Laser Patterning of Conductive Gold Nanostructures by Simultaneous Photopolymerization and Photoreduction

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Sub-15nm Optical Fiber Nanoimprint Lithography: A Parallel, Self-aligned and Portable Approach

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Tailor-made three-dimensional hybrid scaffolds for cell cultures

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Two-photon polymerization with optimized spatial light modulator

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Journal of the European Optical Society-Rapid Publications (2011)

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Experimental Observation of Optical Bound States in the Continuum

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Three-dimensional micro-/nano-structuring via direct write polymerization with picosecond laser pulses

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OPTICS EXPRESS (2011)

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Fabrication and characterization of three-dimensional biomimetic chiral composites

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OPTICS EXPRESS (2011)

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Second-harmonic optimization of computer-generated hologram

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OPTICS LETTERS (2011)

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Dynamic generation of Debye diffraction-limited multifocal arrays for direct laser printing nanofabrication

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OPTICS LETTERS (2011)

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Direct laser writing of 3D scaffolds for neural tissue engineering applications

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BIOFABRICATION (2011)

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Three-dimensional direct laser writing inspired by stimulated-emission-depletion microscopy [Invited]

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OPTICAL MATERIALS EXPRESS (2011)

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Highly Non-Linear Quantum Dot Doped Nanocomposites for Functional Three-Dimensional Structures Generated by Two-Photon Polymerization

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Two-Photon Lithography of Sub-Wavelength Metallic Structures in a Polymer Matrix

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Two-photon polymerization of metal ions doped acrylate monomers and oligomers for three-dimensional structure fabrication

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THIN SOLID FILMS (2004)

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Three-dimensional woodpile photonic crystal templates for the infrared spectral range

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Experimental investigation of single voxels for laser nanofabrication via two-photon photopolymerization

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Control of the cross-sectional shape of a hollow microchannel embedded in photostructurable glass by use of a femtosecond laser

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Multi-level optical data storage in a photobleaching polymer using two-photon excitation under continuous wave illumination

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Femtosecond micromachining of symmetric waveguides at 1.5 μm by astigmatic beam focusing

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OPTICS LETTERS (2002)

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Three-dimensional focal spots related to two-photon excitation

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APPLIED PHYSICS LETTERS (2002)

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Rapid sub-diffraction-limit laser micro/nanoprocessing in a threshold material system

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Axial birefringence in high-numerical-aperture optical systems and the light distribution close to focus

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Finer features for functional microdevices - Micromachines can be created with higher resolution using two-photon absorption.

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