☆ 4.5 Review

Femtosecond laser direct writing of functional stimulus-responsive structures and applications

INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING (2023)

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Article Chemistry, Physical

Three-dimensional printing of mycelium hydrogels into living complex materials

Silvan Gantenbein et al.

Summary: Living materials found in biology, such as animal bones and plant stems, possess unique properties of self-healing, regeneration, and adaptation. In this study, a 3D printing approach is used to exploit the emerging properties of fungal mycelia for creating living complex materials that can self-repair, regenerate, and adapt to the environment. By printing hydrogels infused with Ganoderma lucidum fungus, a mechanically robust and self-cleaning robotic skin is successfully produced, demonstrating the potential of mycelium-based living complex materials.

NATURE MATERIALS (2023)

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Review Materials Science, Multidisciplinary

Micro/nano functional devices fabricated by additive manufacturing

Zhiyuan Huang et al.

Summary: Micro/nano functional devices with deep integration, intelligence, and miniaturization have gained significant attention in frontier research areas. However, traditional micro/nano fabrication techniques show limitations in manufacturing structures with sophisticated geometries and multi-materials. Additive manufacturing (AM) offers great freedom in fabricating highly sophisticated structures over a wide length scale and provides multi-scale, multi-material, and multi-dimensional manufacturing capabilities for micro/nano functional devices. This comprehensive review discusses recent advances in the AM of micro/nano functional devices, including functional materials, AM techniques, fabricated devices, current limitations, and future envision.

PROGRESS IN MATERIALS SCIENCE (2023)

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Review Chemistry, Multidisciplinary

A Review of Smart Superwetting Surfaces Based on Shape-Memory Micro/Nanostructures

Xue Bai et al.

Summary: Bioinspired smart superwetting surfaces with special wettability have gained significant attention for their wide range of applications, such as self-cleaning, oil-water separation, anti-icing/corrosion/fogging, drag reduction, cell engineering, and liquid manipulation. This review focuses on shape-memory polymer (SMP) surfaces, which offer unique shape transformation properties and can be used to achieve desired superwettability through surface microstructure regulation. The review provides a comprehensive overview of fabrication methods, smart superwetting phenomena, and various application fields. The challenges and future prospects of smart superwetting SMP surfaces are also discussed.

SMALL (2023)

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Article Chemistry, Multidisciplinary

4D Direct Laser Writing of Submerged Structural Colors at the Microscale

Bingrui Liu et al.

Summary: In this study, a high-resolution hydrogel photoresist was developed for the fabrication of 4D microscopic SCs using the femtosecond direct laser writing method. By adjusting the laser parameters, pixel palettes with various colors were printed, covering almost the entire color space. Additionally, the hydrogel photoresist was able to undergo reversible discoloration by regulating the solution pH.

SMALL (2023)

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Article Multidisciplinary Sciences

Self-vectoring electromagnetic soft robots with high operational dimensionality

Wenbo Li et al.

Summary: This study presents self-vectoring electromagnetic soft robots (SESRs) that can achieve high-dimensional operation with fewer actuators and control signals than other actuation methods by adjusting and synthesizing the interior electromagnetic vectors (EVs). The researchers also demonstrate complex and rapid 3D shape morphing, bioinspired multimodal locomotion, and fast switches among different locomotion modes, all in passive magnetic fields.

NATURE COMMUNICATIONS (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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Review Chemistry, Multidisciplinary

Stimuli-Responsive Electrospun Fluorescent Fibers Augmented with Aggregation-Induced Emission (AIE) for Smart Applications

Vishal Kachwal et al.

Summary: This review discusses the recent advancements in integrating aggregation-induced emission (AIE) materials with polymer electrospinning to create finely-tuned electrospun fibers with adjustable photophysical and photochemical properties. The review consists of three parts: an introduction to AIE and the underlying mechanisms, an overview of electrospinning techniques for AIE-based fibers, and examples of enhanced properties and applications achieved through electrospinning modified AIEgens. The review highlights the challenges and potential opportunities in the field of electrospun AIE-active fibers.

ADVANCED SCIENCE (2023)

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Review Engineering, Manufacturing

Laser machining fundamentals: micro, nano, atomic and close-to-atomic scales

Jinshi Wang et al.

Summary: With the development of advanced industries, the functional feature size of devices/components has decreased to nanometric and atomic levels. Quantum structures with extreme scale and ideal lattice structures play a critical role in the next generation products. Laser machining is a high-efficient approach widely used in engineering and scientific research. The mechanism of laser-material interaction determines accuracy and surface quality, becoming more complex and dominant at smaller scales.

INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING (2023)

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Article Chemistry, Multidisciplinary

Two-Photon Polymerization of Sugar Responsive 4D Microstructures

Alexa Ennis et al.

Summary: Stimuli-responsive hydrogels have attracted attention for their versatility in offering intelligent solutions for biomimicry applications. Two photon polymerization (2PP) has provided a means of fabricating intricate 3D structures from stimuli-responsive hydrogels. A phenylboronic acid-based photoresist compatible with 2PP is presented to fabricate stimuli-responsive microstructures with accelerated response times.

ADVANCED FUNCTIONAL MATERIALS (2023)

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Article Chemistry, Multidisciplinary

Carbazole-based Anion Ionic Water-Soluble Two-Photon Initiator for Achieving 3D Hydrogel Structures

Fan-Chun Bin et al.

Summary: 3D hydrogel structures made by two-photon polymerization have gained attention in biomedical fields. An anion ionic carbazole-based water-soluble two-photon initiator named BT is proposed to construct arbitrary 3D hydrogel structures. By forming a host-guest complex with a binding ratio of 1:1, BT and Cucurbit[7]uril (CB7) enhance the water solubility, biocompatibility, and nonlinear absorption property of the initiator. A water-soluble photoresist composed of CB7/BT and poly(ethylene glycol) diacrylate is prepared to explore the TPP fabrication capacity. The proposed strategy shows great potential for biomedical applications.

ADVANCED FUNCTIONAL MATERIALS (2023)

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Review Chemistry, Multidisciplinary

Multiphoton Lithography as a Promising Tool for Biomedical Applications

Coralie Greant et al.

Summary: Multiphoton lithography (MPL) is a powerful and useful tool for creating complex 2D and 3D micro- and nanostructures with high spatial resolution. This technology has gained significant interest in tissue engineering and medical device manufacturing due to its ability to generate sophisticated structures not achievable through traditional printing methods. This review discusses the use of two-photon photoinitiators (PIs) and photoreactive biomaterials in biomedical applications and provides an overview of MPL's applications in tissue engineering, biomedical devices, and photodynamic therapy.

ADVANCED FUNCTIONAL MATERIALS (2023)

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Review Chemistry, Multidisciplinary

Recent Advances on High-Speed and Holographic Two-Photon Direct Laser Writing

Antonio Balena et al.

Summary: Thanks to its high sub-diffraction resolution, Two-Photon Lithography is the preferred lithographic technique for small feature sizes and complex 3D patterning. However, its fabrication times are longer than other techniques, limiting its adoption in industry. Combining it with holography approaches can increase its throughput and make it more suitable for industrial applications.

ADVANCED FUNCTIONAL MATERIALS (2023)

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Article Chemistry, Multidisciplinary

Covalent Adaptable Microstructures via Combining Two-Photon Laser Printing and Alkoxyamine Chemistry: Toward Living 3D Microstructures

Yixuan Jia et al.

Summary: This article presents a method for manufacturing programmable materials using alkoxyamines for printing. By investigating different reaction processes, the mechanical properties of the material can be adjusted, and the size of the structure can be changed through polymerization reactions.

ADVANCED FUNCTIONAL MATERIALS (2023)

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Article Chemistry, Multidisciplinary

Multiple-Droplet Selective Manipulation Enabled by Laser-Textured Hydrophobic Magnetism-Responsive Slanted Micropillar Arrays with an Ultrafast Reconfiguration Rate

Sizhu Wu et al.

Summary: In this paper, a strategy for on-demand manipulation of multiple droplets based on magnetism-responsive slanted micropillar arrays (MSMAs) is proposed. The motion mode of droplets can be fine-tuned by changing the volume of droplets and the speed of the magnetic field. The rapid movement and adjustable bending angle of droplets under the action of a magnetic field enable various applications in microfluidic and biomedical engineering.

LANGMUIR (2023)

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Article Materials Science, Multidisciplinary

Increasing the Efficiency of Thermoresponsive Actuation at the Microscale by Direct Laser Writing of pNIPAM

Tobias Spratte et al.

Summary: This study demonstrates the use of poly(N-isopropylacrylamide) (pNIPAM) as an excellent material for generating actuator systems at the micrometer scale. Two-photon direct laser writing is employed to structure thermoresponsive pNIPAM hydrogels, and it is found that the surface-to-volume ratio of the microactuators is crucial to their actuation efficiency. The phase transition of pNIPAM is also confirmed through nanoindentation experiments.

ADVANCED MATERIALS TECHNOLOGIES (2023)

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Article Materials Science, Multidisciplinary

A Facile Approach for 4D Microprinting of Multi-Photoresponsive Actuators

Li-Yun Hsu et al.

Summary: For microscale 4D photoresponsive actuators, a simple strategy is proposed to overcome the conflicting absorptions and allow for the fabrication of multi-photoresponsive 3D microstructures that can be actuated at different wavelengths of light. This is done using two-photon 3D laser printing and liquid crystalline elastomers. By incorporating different dyes into the microstructures, programmable and wavelength-selective actuations are achieved.

ADVANCED MATERIALS TECHNOLOGIES (2023)

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Article Multidisciplinary Sciences

Ultrafast 3D nanofabrication via digital holography

Wenqi Ouyang et al.

Nature Communications (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

Responsive Spiral Photonic Structures for Visible Vapor Sensing, Pattern Transformation and Encryption

Jing Qian et al.

Summary: Two photon polymerization using direct laser writing is a growing field of research that focuses on incorporating soft, responsive polymers to microstructures for added value. By moving to the micron-scale, the speed of actuation for stimuli-responsive materials can be significantly increased. This study demonstrates the fabrication of submicron 2D photonic structures using a vapor-responsive photoresist and evaluates their feasibility as vapor sensors. The structures show reproducible and reversible spectral and structural color changes when exposed to different vapors.

ADVANCED FUNCTIONAL MATERIALS (2023)

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Article Chemistry, Multidisciplinary

Ultra-Robust Joule-Heated Superhydrophobic Smart Window: Dually-Switching Droplets Adhesion and Transparency via In Situ Electric-Actuated Reconfigurable Shape-Memory Shutters

Chao Chen et al.

Summary: This study reports an ultra-robust all-solid-state superhydrophobic smart window that can dynamically adjust the transmittance of light through laser ablation and soft transfer. The surface of the window can switch between a bent mode and an erect mode, allowing for fine-tuning of the solar energy gain. In addition, the window can transition between a sticky state and a slippery state, enabling reversible changes in surface properties. The optimized window design allows for indoor thermal-comfort regulation, visibility encoding, and angle-variable display.

ADVANCED FUNCTIONAL MATERIALS (2023)

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Article Chemistry, Multidisciplinary

Multifunctional 3D-Printed Pollen Grain-Inspired Hydrogel Microrobots for On-Demand Anchoring and Cargo Delivery

Yun-Woo Lee et al.

Summary: This article presents a 3D-printed multifunctional microrobot inspired by pollen grains, which consists of three hydrogel components. Each component has its respective targeted functions, including magnetic field response, temperature responsiveness, and pH-responsive cargo release, enabling the robot to perform various medical functions.

ADVANCED 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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Review Multidisciplinary Sciences

Two decades of two-photon lithography: Materials science perspective for additive manufacturing of 2D/3D nano-microstructures

Arun Jaiswal et al.

Summary: Two-photon lithography (TPL) is a versatile technology for manufacturing micro/nanostructures with sub-wavelength features. Recent advancements in laser technology have enabled its application in various fields. However, the lack of suitable resins has hindered TPL's true potential, leading to ongoing research efforts to develop efficient two-photon polymerizable resins (TPPRs).

ISCIENCE (2023)

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Article Optics

Carnivorous plants inspired shape-morphing slippery surfaces

Dong-Dong Han et al.

Summary: This article reports a moisture responsive shape-morphing slippery surface that enables simultaneous moisture responsive shape-morphing and oil-lubricated water repellency. It is prepared by creating biomimetic microstructures on graphene oxide membrane and subsequent lubricating with a thin layer of oil on the laser structured reduced GO surface. The integration of this surface with an LRGO/GO bilayer actuator enables droplet sliding ability and enhanced moisture deformation performance, demonstrating versatility for active/passive trapping, droplet manipulation, and sensing.

OPTO-ELECTRONIC ADVANCES (2023)

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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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Review Chemistry, Multidisciplinary

4D Printing of Liquid Crystals: What's Right for Me?

Marc del Pozo et al.

Summary: This paper highlights the recent advances in the combination of liquid crystals and additive manufacturing, emphasizing the importance of liquid crystals as responsive materials in this field. By comparing and analyzing selected works, it provides an educational overview of this crossover field and proposes suggestions for future research.

ADVANCED MATERIALS (2022)

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Review Chemistry, Multidisciplinary

Designable Micro-/Nano-Structured Smart Polymeric Materials

Wei Wang et al.

Summary: Smart polymeric materials that can respond to environmental stimuli and dynamically adjust their physico-chemical characteristics have gained significant attention in various fields. The combination of micro-/nano-structures and molecular design offers promising opportunities for the development of advanced smart polymeric materials. This review highlights recent progress in the design and fabrication of smart polymeric materials that incorporate micro-/nano-structures and molecular design to achieve desired functions. Various examples, including smart hydrogels, gating membranes, gratings, milli-particles, micro-particles, and microvalves, are discussed, emphasizing the interplay between their micro-/nano-structures and responsive properties for practical applications. The review concludes with perspectives on the current challenges and future opportunities in the development of micro-/nano-structured smart polymeric materials.

ADVANCED MATERIALS (2022)

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Article Chemistry, Multidisciplinary

A Tissue Adhesion-Controllable and Biocompatible Small-Scale Hydrogel Adhesive Robot

Yun-Woo Lee et al.

Summary: Minimally invasive medical interventions using wireless small-scale medical robots with strong adhesion capability and easy controlled detachment have gained attention. In this study, a small-scale soft robot with octopus-inspired hydrogel adhesive (OHA) is proposed. The OHA robot achieves strong wet adhesion to biological tissues by preventing the collapse of the octopus-inspired patterns during preloading. It also enables easy detachment through temperature changes due to the introduction of poly(N-isopropylacrylamide) hydrogel. The robot demonstrates efficient biomedical functions inside the body, paving the way for future wireless soft miniature robots with minimally invasive medical interventions.

ADVANCED MATERIALS (2022)

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Article Chemistry, Physical

Smart surfaces with reversibly switchable wettability: Concepts, synthesis and applications

Hui Liu et al.

Summary: Manufacturing smart switchable surfaces has become a widely discussed topic in recent years. This systematic review presents the latest research on reversibly switchable wettability of smart surfaces, discussing different triggers and applications, providing insights and guidance for smart surface engineering.

ADVANCES IN COLLOID AND INTERFACE SCIENCE (2022)

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Article Physics, Applied

Laser-induced morphology-switchable slanted shape memory microcones for maneuvering liquid droplets and dry adhesion

Chuanzong Li et al.

Summary: This study presents a viable strategy to prepare a slanted shape memory microcone array (SSMMA) using femtosecond laser oblique microfabrication and replica-mold method. The SSMMA has a fast temperature-responsive feature, facilitating the control of droplet sliding and the grab and transfer of fragile objects. The study opens up possibilities for rapidly fabricating functional slanted microstructures.

APPLIED PHYSICS LETTERS (2022)

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Review Chemistry, Multidisciplinary

Materials for Smart Soft Actuator Systems

Indra Apsite et al.

Summary: Soft actuators offer advantages such as flexibility, adaptability, and reconfigurability compared to conventional hard actuators, making them promising for applications in various fields. Intelligent materials can provide additional degrees of freedom for soft actuators, allowing them to change structure, properties, and shape under external signals. Utilizing intelligent materials can significantly reduce device size and enable applications not achievable by externally powered systems.

CHEMICAL REVIEWS (2022)

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Review Automation & Control Systems

A short review on functionalized metallic surfaces by ultrafast laser micromachining

Zongjie Chen et al.

Summary: This paper provides an overview of the advances in the fabrication of functionalized metallic surfaces using ultrafast laser micromachining. It discusses the principles of interaction between ultrafast laser and metallic materials, presents state-of-the-art knowledge on fabrication methods based on surface topography, and highlights the functionalized properties of laser micro-machined metals. Furthermore, it addresses the challenges and future prospects of surface functionalized metals.

INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY (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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Review Biochemistry & Molecular Biology

Recent Advances in Bioinspired Hydrogels with Environment-Responsive Characteristics for Biomedical Applications

Chao Ran et al.

Summary: Intelligent hydrogels integrated with therapeutic medicines can significantly contribute to medical diagnosis and treatment advancements; these hydrogels with the ability to respond to environmental conditions offer promising solutions in the biomedical field; bioinspired intelligent hydrogels are becoming a potentially powerful biomaterial class for tissue engineering, drug delivery, and medical devices.

MACROMOLECULAR BIOSCIENCE (2022)

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Article Nanoscience & Nanotechnology

Laser nanoprinting of floating three-dimensional plasmonic color in pH-responsive hydrogel

Wanyi Li et al.

Summary: This article presents a method for achieving color patterning in three-dimensional metasurfaces using laser nanoprinting technology. Through laser-induced photoreduction of silver ions, nanoparticles are anchored in a pH-responsive smart hydrogel matrix, and a wide range of color regulation is achieved by adjusting the nanoparticle spacing. This method is important for applications such as active spectral filtering, information encryption, security tagging, and biological colorimetric sensing.

NANOTECHNOLOGY (2022)

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Article Chemistry, Multidisciplinary

CeFlowBot: A Biomimetic Flow-Driven Microrobot that Navigates under Magneto-Acoustic Fields

Sumit Mohanty et al.

Summary: The unique pumping mechanism of cephalopods has been mimicked in an untethered microrobot called CeFlowBot, utilizing an array of vibrating bubbles to enhance propulsion. Functionalized with magnetic layers, CeFlowBots can be steered under combined magnetic and acoustic fields to navigate remote environments and perform targeted manipulation, making them useful for clinical applications such as targeted drug delivery. Additionally, an ultrasound imaging system is employed to visualize the motion of CeFlowBots in hard-to-reach environments inaccessible to optical cameras.

SMALL (2022)

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Article Materials Science, Multidisciplinary

Large reversible upconversion luminescence modification and 3D optical information storage in femtosecond laser irradiation-subjected photochromic glass

Daiwen Xiao et al.

Summary: The photochromic glass doped with rare-earth ions was investigated under fs laser irradiation, showing fast response and high upconversion luminescence modification. It can be used for 3D information storage.

SCIENCE CHINA-MATERIALS (2022)

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Article Materials Science, Multidisciplinary

Grayscale Stereolithography of Gradient Hydrogel with Site-Selective Shape Deformation

Pan Jiang et al.

Summary: The research proposes a strategy for programmable shape deformation of hydrogels using grayscale stereolithography, which can control the spatial gradient crosslinking density of hydrogels to achieve expected shape deformation in three dimensions. By adjusting grayscale light intensity and exposure time, predictable shape deformation can be parametrically controlled, while hydration and dehydration properties endow the shape deformation hydrogel with reversible feature.

ADVANCED MATERIALS TECHNOLOGIES (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

Irregular LIPSS produced on metals by single linearly polarized femtosecond laser

Dongshi Zhang et al.

Summary: This study demonstrates the generation of supra-wavelength periodic surface structures (SWPSS) on Sn and triangular and rhombic laser-induced periodic surface structures (LIPSS) on W, Mo, Ta, and Nb using a single linearly polarized femtosecond laser. The SWPSS patches possess independent orientations, breaking the traditional rules. The maximal period reported for SWPSS is 25 μm, while the formation of LIPSS depends on material composition. The study also characterizes the reflectance and iridescence of the prepared SWPSS and LIPSS.

INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING (2022)

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Review Chemistry, Multidisciplinary

Micro-Nano Structure Functionalized Perovskite Optoelectronics: From Structure Functionalities to Device Applications

Yan Zhan et al.

Summary: Metal halide perovskite is a promising photosensitive semiconductor with excellent photophysical properties. However, its high refractive index and thin film thickness limit its optical performance and mechanical robustness. Therefore, researchers have studied micro-nano structured perovskite optoelectronics and discussed its specific applications in optoelectronic devices.

ADVANCED FUNCTIONAL MATERIALS (2022)

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Article Chemistry, Multidisciplinary

Sunlight Recovering the Superhydrophobicity of a FemtosecondLaser-Structured Shape-Memory Polymer

Xue Bai et al.

Summary: A recoverable superhydrophobic surface driven by sunlight was developed by constructing a micropillar array on the surface of a photo-responsive shape-memory polymer. This surface can completely recover its morphology and wettability upon sunlight irradiation and has potential applications in various fields.

LANGMUIR (2022)

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Article Chemistry, Multidisciplinary

Reconfigurable Magnetic Liquid Metal Robot for High-Performance Droplet Manipulation

Yuxuan Zhang et al.

Summary: A reconfigurable magnetic liquid metal robot (MLMR) is proposed for droplet manipulation, which can achieve diverse manipulation behaviors and flexible shape adjustment through magnetic field drive. This technology has broad application potential in microfluidics, biochemistry, and other fields.

NANO LETTERS (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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Review Cell Biology

Interplay between mechanics and signalling in regulating cell fate

Henry De Belly et al.

Summary: This article reviews the importance of mechanical signalling in development and adult organisms, and discusses the regulation of biological processes by outside-in mechanical signalling and cell surface mechanics. The interaction between mechanosensing, intracellular signalling, and cell surface mechanics has a significant impact on stem cell fate and development.

NATURE REVIEWS MOLECULAR CELL BIOLOGY (2022)

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Review Optics

Review of femtosecond laser machining technologies for optical fiber microstructures fabrication

Mao-qing Chen et al.

Summary: By using femtosecond (fs) laser micro-machining technology to fabricate sensing structures, the accuracy limits of traditional processing technology can be surpassed, enabling true three-dimensional structure production and enhancing key performance indicators of optical fiber sensors.

OPTICS AND LASER TECHNOLOGY (2022)

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Article Chemistry, Multidisciplinary

Fabrication, Flow Assembly, and Permeation of Microscopic Any-Shape Particles

Arne Lueken et al.

Summary: This study demonstrates the continuous high-throughput fabrication of microscopic 3D particles with complex shape and sub-micron resolution using continuous two-photon vertical flow lithography. The study also analyzes the interactions and permeability of differently shaped particles and shows the potential application of the particles in bio-hybrid tissue. Overall, this study pushes the research boundaries of adaptive, responsive, and permeable 3D scaffolds and granular media.

SMALL (2022)

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Article Instruments & Instrumentation

Reversible energy absorption of elasto-plastic auxetic, hexagonal, and AuxHex structures fabricated by FDM 4D printing

N. Namvar et al.

Summary: The present study introduces a method of using 4D printing process to manufacture reconfigurable mechanical metamaterials for recoverable energy dissipation and absorption applications with shape memory effects. It is found that metamaterials with re-entrant auxetic unit-cells exhibit better energy absorption capability and show mechanical hysteresis and energy dissipation when undergoing a loading-unloading cycle.

SMART MATERIALS AND STRUCTURES (2022)

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Article Multidisciplinary Sciences

Creating three-dimensional magnetic functional microdevices via molding-integrated direct laser writing

Zemin Liu et al.

Summary: The authors propose a molding-integrated direct laser writing fabrication protocol to create 3D micron-scale devices with programmable magnetization and multi-material integration. This method enables diverse motions and functionalities, showcasing its versatility in various fields such as healthcare, robotics, metamaterials, microfluidics, and programmable matter.

NATURE COMMUNICATIONS (2022)

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Article Chemistry, Multidisciplinary

4D Printing of a Fully Biobased Shape Memory Copolyester via a UV-Assisted FDM Strategy

Di Wu et al.

Summary: By utilizing fully biobased materials, shape memory copolyesters were developed with a flexible and crystalline component serving as a molecular switch for shape memory effects and a PBI moiety acting as cross-linking points under UV irradiation to enhance interlayer adhesion and performance of printed materials.

ACS SUSTAINABLE CHEMISTRY & ENGINEERING (2022)

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Review Chemistry, Analytical

Femtosecond Laser-Fabricated Photonic Chips for Optical Communications: A Review

Chengkun Cai et al.

Summary: Integrated optics, with its unique advantages of small size, low loss, high integration, and high scalability, has been widely applied in optical communications. Femtosecond laser fabrication is an acknowledged technique for producing integrated photonic devices with rapid prototyping and single-step fabrication. This review focuses on the progress of femtosecond laser-fabricated photonic chips for optical communications, covering various functions and devices.

MICROMACHINES (2022)

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Article Multidisciplinary Sciences

Wireless soft millirobots for climbing three-dimensional surfaces in confined spaces

Yingdan Wu et al.

Summary: A fundamental peeling-and-loading mechanism is reported in this study, enabling untethered soft-bodied robots to climb 3D surfaces by utilizing both soft-body deformation and whole-body motion under external magnetic fields. The mechanism allows vertical and inverted surface climbing on diverse 3D surfaces with complex geometries and different surface properties.

SCIENCE ADVANCES (2022)

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Article Materials Science, Multidisciplinary

Flytrap Inspired pH-Driven 3D Hydrogel Actuator by Femtosecond Laser Microfabrication

Jian-Yu Wang et al.

Summary: Inspired by the intelligent response of flytrap, a smart hydrogel microactuator based on a bionic asymmetric structure is demonstrated. The grasping and releasing behavior of the microactuator for micro-objects can be realized and tuned by using pH-triggered shape changes, demonstrating its potential for applications, such as flexible robotics, smart sensors, and microscopic manipulation.

ADVANCED MATERIALS TECHNOLOGIES (2022)

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Review Biochemistry & Molecular Biology

A Review on Stimuli-Actuated 3D Micro/Nanostructures for Tissue Engineering and the Potential of Laser-Direct Writing via Two-Photon Polymerization for Structure Fabrication

Bogdan Stefanita Calin et al.

Summary: This review presents the recent research on the fabrication of 3D micro/nanostructures for tissue engineering applications. The overview includes backbone constructs for cell attachment, proliferation, and differentiation, as well as structures that can control cellular processes for faster tissue regeneration using various stimuli. The review also discusses recent applications and fabrication techniques, with emphasis on laser-assisted technologies.

INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES (2022)

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Article Engineering, Manufacturing

Laser-induced microjet-assisted ablation for high-quality microfabrication

Yang Guo et al.

Summary: Liquid-assisted laser ablation has the advantage of relieving thermal effects but can also deteriorate laser beam transmission stability. A continuous and directional high-speed microjet can be formed through laser-induced cavitation bubbles, which helps to remove debris and improve material removal process and surface quality.

INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING (2022)

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Article Nanoscience & Nanotechnology

Ultrafast Laser-Ablated Bioinspired Hydrogel-Based Porous Gating System for Sustained Drug Release

Juan Zhang et al.

Summary: A biomimetic hydrogel-based porous gating system (HPGS) was successfully fabricated using in situ femtosecond laser microdrilling and ultraviolet exposure. The HPGS exhibited stability under physiological conditions and achieved sustained drug release in a low pH environment. The drug release was mainly controlled by non-Fickian diffusion, allowing for dynamic speed control of molecular transport. Moreover, the HPGS demonstrated excellent therapeutic efficacy in eliminating HeLa cells in acidic tumor environments. This functional HPGS has significant implications for the treatment of digestive diseases.

ACS APPLIED MATERIALS & INTERFACES (2022)

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Article Nanoscience & Nanotechnology

On-Demand Maneuvering of Diverse Prodrug Liquids on a Light-Responsive Candle-Soot-Hybridized Lubricant-Infused Slippery Surface for Highly Effective Toxicity Screening

Shuneng Zhou et al.

Summary: The study presents a light-responsive candle-soothybridized lubricant-infused slippery surface (CS-LISS) for highly effective and flexible drug HTS. By utilizing near-infrared irradiation and self-cleaning capabilities, the CS-LISS enables rapid fusion and directional steering of droplets in drug screening. Integrated with a GFP HeLa cell chip, it achieves high-efficiency drug toxicity screening.

ACS APPLIED MATERIALS & INTERFACES (2022)

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Article Nanoscience & Nanotechnology

Flexible Tri-switchable Wettability Surface for Versatile Droplet Manipulations

Yuegan Song et al.

Summary: This study introduces a smart surface with tunable wettability, utilizing femtosecond laser direct writing to achieve distinct wettability of different components, enabling reversible switching between multiple wetting states for multifunctional manipulation of droplets in microfluidic applications.

ACS APPLIED MATERIALS & INTERFACES (2022)

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Article Nanoscience & Nanotechnology

Femtosecond Laser Densification of Hydrogels to Generate Customized Volume Diffractive Gratings

Zheng Xiong et al.

Summary: In this study, the authors propose a new method called femtosecond (fs) laser-induced densification to generate diffractive gratings within hydrogel materials. By controlling the parameters of the fs laser, custom volume gratings can be fabricated within the hydrogel. The method is also demonstrated to be applicable to pH-responsive hydrogels.

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

Bioinspired Lubricated Slippery Magnetic Responsive Microplate Array for High Performance Multi-Substance Transport

Kexiang Shao et al.

Summary: In this study, a triple-biologically inspired lubricated slippery magnetic-responsive microplate array (LS-MMA) was proposed for multi-substance transport. By applying a moving magnetic field, the microplates bend and overlap to form a continuous slippery surface, enabling the transport of bubbles, droplets, and solid objects. Through the adhesive properties of the lubricant, the LS-MMA also achieves three-dimensional transport of bubbles and droplets. This multi-substance transport strategy improves the applicability and flexibility of target manipulation.

ADVANCED FUNCTIONAL MATERIALS (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

Wireless Miniature Magnetic Phase-Change Soft Actuators

Yichao Tang et al.

Summary: The article introduces a miniature magnetic phase-change soft composite actuator with large output force and work capacity, which can be used in potential applications in medical and robotic fields. Experiments demonstrate that the actuator performs well under remote magnetic radio frequency heating, showing its promising prospects for diverse applications.

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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Review Chemistry, Physical

Droplet manipulation on superhydrophobic surfaces based on external stimulation: A review

Chen Yang et al.

Summary: Superhydrophobic surfaces with high water contact angles and low surface energy have great potential for droplet manipulation, especially in response to external stimuli. Recent research has shown promising results in this field.

ADVANCES IN COLLOID AND INTERFACE SCIENCE (2022)

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Article Multidisciplinary Sciences

Mechanical nanolattices printed using nanocluster-based photoresists

Qi Li et al.

Summary: This study reports a strategy for the rapid nanoprinting of complex structural nanocomposites using metal nanoclusters. The ultrasmall, quantum-confined nanoclusters function as two-photon activators and precursors for mechanical reinforcements and nanoscale porogens. Complex 3D nanocomposites and structures with tunable nanoporosity are printed using this method. The nanocluster-polymer nanolattices exhibit high specific strength, energy absorption, deformability, and recoverability. This framework provides a generalizable, versatile approach for the use of photoactive nanomaterials in additive manufacturing of complex systems with emergent mechanical properties.

SCIENCE (2022)

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Article Polymer Science

Humidity Responsive Reflection Grating Made by Ultrafast Nanoimprinting of a Hydrogel Thin Film

Stefan Cesnik et al.

Summary: This research aims to improve the response time of humidity sensors by changing the surface-to-volume ratio of a humidity-sensitive polymer thin film and using an optical read-out method. Large and uniform nanostructured areas are created on the thin film using nanoimprint lithography. The first proof of concept shows that the response time of the structured thin film is at least three times faster than commercial sensors.

MACROMOLECULAR RAPID COMMUNICATIONS (2022)

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Article Multidisciplinary Sciences

A bioinspired snap-through metastructure for manipulating micro-objects

Xuan Zhang et al.

Summary: Inspired by the trigger plant, this study explores a mechanical metastructure for overcoming adhesion using a spring lock mechanism. Reversible miniaturized snap-through devices are successfully realized by micron-scale direct printing, allowing for successful pick-and-place handling of micro-objects. This technique is applicable in various scenarios and surface conditions.

SCIENCE ADVANCES (2022)

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Article Pharmacology & Pharmacy

Microrobot with Gyroid Surface and Gold Nanostar for High Drug Loading and Near-Infrared-Triggered Chemo-Photothermal Therapy

Shirong Zheng et al.

Summary: A magnetically guided helical microrobot with a Gyroid surface is proposed for high drug-loading efficiency and precise drug delivery. All spaces inside the microrobot are interconnected, enabling drug loading deep inside the structure. Gold nanostars are introduced for near-infrared-induced photothermal therapy and triggering drug release.

PHARMACEUTICS (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 Physics, Multidisciplinary

Non-Abelian Thouless pumping in photonic waveguides

Yi-Ke Sun et al.

Summary: Non-Abelian Thouless pumping has been experimentally realized in an on-chip photonic platform, where the outcome depends on the sequence of pumping operations. This study can reveal more complex non-Abelian topological physics and has the potential to realize on-chip non-Abelian photonic devices.

NATURE PHYSICS (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 Materials Science, Multidisciplinary

Bioinspired Anti-Fogging and Anti-Fouling Artificial Compound Eyes

Minjing Li et al.

Summary: In this study, a multi-functional curved artificial compound eye (MF-ACE) was fabricated using a combination of femtosecond laser wet etching, soft lithography, and PDMS swelling methods. The MF-ACE exhibited excellent anti-fogging, anti-fouling, and self-cleaning abilities, as well as high optical performance and uniformity. It has potential applications in various fields under harsh environmental conditions.

ADVANCED OPTICAL MATERIALS (2022)

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Review Optics

Liquid crystal-based structural color actuators

Pei Zhang et al.

Summary: Animals can modify their body shape and color for protection, inspiring the development of actuator with color changes. Liquid crystal-based actuators offer a promising approach for achieving structural color changes.

LIGHT-SCIENCE & APPLICATIONS (2022)

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Article Multidisciplinary Sciences

Magnetically encoded 3D mesostructure with high-order shape morphing and high-frequency actuation

Rui Li et al.

Summary: Inspired by origami/kirigami, this study introduces a magnetically encoded transferable 3D mesostructure with high-order shape morphing and high-frequency actuation capabilities, which is applied for multiple functional devices.

NATIONAL SCIENCE REVIEW (2022)

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Article Chemistry, Multidisciplinary

Puffball-Inspired Microrobotic Systems with Robust Payload, Strong Protection, and Targeted Locomotion for On-Demand Drug Delivery

Xin Song et al.

Summary: Microrobots inspired by puffballs are developed, featuring an internal chamber for loading large drug quantities and spatial drug separation, and a near-infrared-responsive top-sealing layer offering strong drug protection and on-demand release. These puffball-inspired microrobots (PIMs) have tunable loading capacities, enhanced drug protection, and high drug release efficiency upon near-infrared laser irradiation.

ADVANCED MATERIALS (2022)

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Review Engineering, Biomedical

4D printing: a cutting-edge platform for biomedical applications

Moqaddaseh Afzali Naniz et al.

Summary: This paper introduces the evolution of natural materials and how the issue of static printed objects not being able to reshape dynamically is addressed through 4D printing technology. It also discusses the recent developments in smart materials and their potential applications in biomedical engineering.

BIOMEDICAL MATERIALS (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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Article Chemistry, Multidisciplinary

Rapid and Multimaterial 4D Printing of Shape-Morphing Micromachines for Narrow Micronetworks Traversing

Chen Xin et al.

Summary: Micromachines with high environmental adaptability have the potential to deliver targeted drugs in complex biological networks. However, current 4D printing methods have limitations in processing efficiency and single processing material, which restrict the development and application of shape-morphing micromachines (SMMs). In this study, two 4D printing strategies using pH-responsive hydrogels were proposed to fabricate SMMs for complex micro-networks traversing. The SMMs showed efficient magnetic, bubble, and hybrid propulsion modes and demonstrated the capability of traversing narrow micronetworks for targeted cargo delivery.

SMALL (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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Review Chemistry, Multidisciplinary

Light-Controlled Microbots in Biomedical Application: A Review

Md Faiyaz Jamil et al.

Summary: The article summarizes the achievements, future possibilities, and challenges facing light-powered microbots. It also proposes feasible ways to overcome challenges, providing assistance for future researchers in studying and developing the next generation of light-actuated microbots.

APPLIED SCIENCES-BASEL (2022)

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Article Crystallography

Laser Written Stretchable Diffractive Optic Elements in Liquid Crystal Gels

Bohan Chen et al.

Summary: This paper demonstrates the fabrication of mechanically tunable diffraction gratings in stretchable LC gels using a combination of two-photon polymerization direct laser writing (TPP-DLW) and ultraviolet (UV) irradiation. The results show that a diffraction grating can be written using TPP-DLW in the presence of an electric field to align and lock-in the LC director in a homeotropic configuration. The paper also presents the change in the diffraction grating period and far-field diffraction pattern when the film is stretched or contracted.

CRYSTALS (2022)

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Article Engineering, Manufacturing

Burst mode enabled ultrafast laser inscription inside gallium arsenide

Andong Wang et al.

Summary: Ultrafast laser inscription (ULI) inside semiconductors, such as gallium arsenide (GaAs), offers new possibilities for 3D monolithic structures in electronic and photonic microdevices. This paper presents a study on ULI inside GaAs and proposes the use of burst-mode irradiation to overcome nonlinear effects and achieve successful machining. The results demonstrate the potential application of the proposed method for 3D structuring inside GaAs.

INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING (2022)

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Review Chemistry, Multidisciplinary

The Development Progress of Surface Structure Diffraction Gratings: From Manufacturing Technology to Spectroscopic Applications

Ye Wang et al.

Summary: In this paper, the development status of high-precision diffraction gratings and the latest advancements in manufacturing techniques are reviewed.

APPLIED SCIENCES-BASEL (2022)

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Review Nanoscience & Nanotechnology

Microfluidic systems toward blood hemostasis monitoring and thrombosis diagnosis: From design principles to micro/nano fabrication technologies

Yi Xu et al.

Summary: Perfusable endothelialized models created through micro/nano engineering advances in microfluidic systems have shown improvements in blood hemostasis monitoring and thrombosis treatment. However, current platelet aggregation tests fail to meet clinical requirements. This review provides an overview of microfluidic system design principles and fabrication strategies for studying platelet adhesion and aggregation. The importance, benefits, challenges, and potential for clinical applications of these principles and methods are discussed.

VIEW (2022)

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Article Automation & Control Systems

Magnetic Resonance Imaging-Based Tracking and Navigation of Submillimeter-Scale Wireless Magnetic Robots

Mehmet Efe Tiryaki et al.

Summary: The utilization of MRI technology in magnetic control of robots has opened up new opportunities for minimally invasive medical procedures. A novel 1D projection-based MRI approach has been developed to track magnetic particles as small as 300 micrometers in diameter, which could significantly enhance the precision of future minimally invasive medical operations.

ADVANCED INTELLIGENT SYSTEMS (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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Review Chemistry, Multidisciplinary

A Review of Shape Memory Polymers and Composites: Mechanisms, Materials, and Applications

Yuliang Xia et al.

Summary: SMPs and SMPCs, as stimuli-responsive polymers, have broad application prospects in multiple fields with features of large recoverable deformation, enhanced mechanical properties, and controllable remote actuation. These materials combine functional, reversible, multiple, and controllable shape recovery processes, applicable in aerospace engineering, biomedical devices, flexible electronics, and soft robotics among others.

ADVANCED MATERIALS (2021)

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Review Engineering, Biomedical

Stimuli-Responsive Biomaterials: Scaffolds for Stem Cell Control

Amy Gelmi et al.

Summary: Engineering biomaterials can recreate the microenvironmental and endogenous cues affecting stem cell fate in an ex vivo environment, providing temporal and spatial cues to stem cells through responsive to exogenous stimulation. These stimuli-responsive biomaterials have versatile applications in studying stem cell responses and cellular manipulation, with promising potential for future personalized tissue engineering and organoid models.

ADVANCED HEALTHCARE MATERIALS (2021)

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Article Chemistry, Multidisciplinary

Environmentally Adaptive Shape-Morphing Microrobots for Localized Cancer Cell Treatment

Chen Xin et al.

Summary: The development of environmentally adaptive shape-morphing microrobots (SMMRs) with programmatically encoded expansion rates in pH-responsive hydrogel enables targeted microparticle delivery. Combining magnetic propulsion, a shape-morphing microcrab (SMMC) is capable of gripping, transporting, and releasing microparticles.

ACS NANO (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 Chemistry, Multidisciplinary

Noncontact All-In-Situ Reversible Reconfiguration of Femtosecond Laser-Induced Shape Memory Magnetic Microcones for Multifunctional Liquid Droplet Manipulation and Information Encryption

Chuanzong Li et al.

Summary: The study developed iron particles doped shape memory microcones that can be tuned between tilted and upright states under light and magnetic field. The magnetic microcones, fabricated using laser ablation replica molding, allow precise control of height. It was also observed that droplets can be transported unidirectionally on the tilted microcones.

ADVANCED FUNCTIONAL MATERIALS (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 Chemistry, Multidisciplinary

In Situ Tuning Underwater Bubble Movement on Slippery Lubricant-Infused Anisotropic Microgrooved Surface by Unidirectional Mechanical Strain

Yunlong Jiao et al.

Summary: Research focuses on designing and fabricating functional interfaces to control the movement behavior of underwater gas bubbles. A slippery lubricant-infused anisotropic microgrooved surface (SLI-AMGS) was successfully fabricated using femtosecond laser direct writing technology, allowing for reversible switching between underwater bubble sliding and pinning. By changing mechanical tensile strain, real-time dynamic modulation of underwater bubbles was demonstrated in different acid-based environments, showing potential applications in various fields such as underwater bubble microfluidics and microbubble robots.

LANGMUIR (2021)

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Review Optics

Femtosecond laser-based processing methods and their applications in optical device manufacturing: A review

Xiaoduo Wang et al.

Summary: Femtosecond laser fabrication offers unique advantages for manufacturing optical and photonic devices based on complex 3D structures, with versatile applications in various fields. This review highlights recent advancements in femtosecond laser fabrication technologies and their applications, as well as methods and applications for manufacturing cutting-edge optical devices.

OPTICS AND LASER TECHNOLOGY (2021)

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Review Multidisciplinary Sciences

Designable structural coloration by colloidal particle assembly: from nature to artificial manufacturing

Kaixuan Li et al.

Summary: This review focuses on the design of artificial structural colors based on colloidal particle assembly and summarizes the functional bioinspired structure colors. It demonstrates the design principles of biomimetic structural colors via precise structure engineering and typical bottom-up methods, and outlines some main applications and future prospects. The review aims to introduce recent design strategies about artificial structure colors and provide insights for future development.

ISCIENCE (2021)

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Article Chemistry, Multidisciplinary

Liquid-Crystal-Elastomer-Actuated Reconfigurable Microscale Kirigami Metastructures

Mingchao Zhang et al.

Summary: This study focuses on the fabrication of microscale thermo-responsive reconfigurable metasurfaces using stimuli-responsive liquid crystal elastomers (LCEs) as artificial muscle, and explores the relationship between shape transformation behaviors and geometrical parameters of the kirigami structures. Additionally, temperature-dependent switching and information encryption applications are demonstrated as proof of concept.

ADVANCED MATERIALS (2021)

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Article Chemistry, Multidisciplinary

λ/12 Super Resolution Achieved in Maskless Optical Projection Nanolithography for Efficient Cross-Scale Patterning

Yu-Huan Liu et al.

Summary: The proposed maskless optical projection nanolithography (MLOP-NL) technique provides an efficient means of achieving cross-scale patterning with large-scale and precise configuration.

NANO LETTERS (2021)

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Article Chemistry, Multidisciplinary

Robust Hierarchical Porous PTFE Film Fabricated via Femtosecond Laser for Self-Cleaning Passive Cooling

Junrui Wu et al.

Summary: This study presents the fabrication of a robust hierarchical porous polytetrafluoroethylene (PTFE) film with self-cleaning function using femtosecond laser ablation technique. The surface structure exhibits outstanding durability of passive cooling effect, resulting in temperature decrease of up to 4 and 10 degrees C compared to other surfaces. This research demonstrates the feasibility of femtosecond laser micromachining in producing durable self-cleaning passive cooling materials.

NANO LETTERS (2021)

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Review Chemistry, Analytical

3D Manufacturing of Glass Microstructures Using Femtosecond Laser

Agne Butkute et al.

Summary: The rapid expansion of femtosecond laser technology has enabled significant advances in the 3D processing of transparent materials, leading to the production of high-precision structures like nanophotonic elements and microfluidic systems. This review discusses the underlying physical mechanism of material interaction with ultrashort pulses, its applications in 3D processing, and possible limitations. Further directions for field development, including synergies with other fs-laser-based manufacturing techniques, are highlighted.

MICROMACHINES (2021)

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Review Chemistry, Analytical

Tethered and Untethered 3D Microactuators Fabricated by Two-Photon Polymerization: A Review

Zhaoxin Lao et al.

Summary: Microactuators can convert external stimuli into mechanical motion at microscale and have wide applications. Compared to traditional 2D MEMS devices, 3D microactuators offer a new platform for stimuli-responsive functional devices. 3D laser printing is a promising technique for creating smart devices due to its versatility and flexibility.

MICROMACHINES (2021)

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Article Engineering, Environmental

How to adjust bubble?s adhesion on solid in aqueous media: Femtosecond laser-ablated patterned shape-memory polymer surfaces to achieve bubble multi-manipulation

Jinglan Huo et al.

Summary: Manipulating the behavior of gas bubbles in aqueous environments is crucial in medical and microfluidic fields. By combining different surface morphologies, researchers have achieved adjustable underwater bubble adhesion, allowing for precise bubble manipulation and transportation. This study opens up possibilities for developing novel strategies for multi-manipulation of bubbles in practical applications.

CHEMICAL ENGINEERING JOURNAL (2021)

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Article Chemistry, Multidisciplinary

Nano-3D-Printed Photochromic Micro-Objects

Sebastian Ulrich et al.

Summary: This study presents the first photoresist for direct laser writing of photochromic 3D micro-objects via two-photon polymerization, enabling rapid processing of complex microstructures with excellent photoresponsiveness and reversible color-changing. The work provides a new approach for custom microfabrication of 3D photochromic objects with molecularly engineered color and responsiveness.

SMALL (2021)

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Review Optics

Hybrid laser precision engineering of transparent hard materials: challenges, solutions and applications

Huagang Liu et al.

Summary: Laser is a versatile tool for precision engineering with rapid development and extensive applications. Hybrid laser processing technologies have been developed to overcome challenges in processing transparent hard materials and show remarkable benefits for microstructures and functional devices fabrication.

LIGHT-SCIENCE & APPLICATIONS (2021)

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Article Chemistry, Multidisciplinary

In Situ Electric-Induced Switchable Transparency and Wettability on Laser-Ablated Bioinspired Paraffin-Impregnated Slippery Surfaces

Chao Chen et al.

Summary: This study introduces a Joule-heat-responsive impregnated slippery surface with switchable wetting and optical properties, allowing in-situ controllable motion of liquids and reversible conversion of optical visibility. By applying/ discharging low electric-trigger, diverse liquids can be controlled on planar/curved surfaces and optical visibility can be switched between opaque and transparent modes.

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 Multidisciplinary Sciences

Magnetic soft micromachines made of linked microactuator networks

Xinghao Hu et al.

Summary: This study utilizes two-photon polymerization to fabricate soft untethered micromachines with overall sizes less than 100 μm, linking Janus microparticle-based magnetic microactuators and positioning them with magnetic field-based torques. The fabrication strategy enables programmed shape transformations and various robotic gaits for surface locomotion.

SCIENCE ADVANCES (2021)

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Article Multidisciplinary Sciences

3D printed personalized magnetic micromachines from patient blood-derived biomaterials

Hakan Ceylan et al.

Summary: This study proposes a personalized approach using patient blood-derivable biomaterials to construct wireless medical micromachines, aiming to alleviate safety risks from biocompatibility issues. The micro-machines demonstrated in this study exhibit multi-responsive and pH-responsive functions for controlled cargo delivery and release applications. The use of proteinaceous fabrics also enables enzymatic degradability, lowering potential risks of long-term toxicity.

SCIENCE ADVANCES (2021)

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Article Materials Science, Multidisciplinary

4D Thermomechanical metamaterials for soft microrobotics

Qingxiang Ji et al.

Summary: The research presents a soft micro robot based on metamaterials that can achieve controlled motion under thermal stimuli. The system consists of two functional structures: a rotational element and a translational element, both designed based on the thermoelastic bilayer plate principle.

COMMUNICATIONS MATERIALS (2021)

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Article Engineering, Manufacturing

Femtosecond laser fabrication of nanograting-based distributed fiber sensors for extreme environmental applications

Mohan Wang et al.

Summary: This paper discusses the precision inscription of nanogratings in silica fiber cores using femtosecond lasers for device fabrication and sensing applications in extreme environmental conditions. The high-temperature stable and low insertion loss sensors were continuously inscribed point by point, showing stable and distributed temperature measurements in extreme radiation environments. The femtosecond-laser-fabricated fiber sensors have been proven suitable measurement devices for applications in extreme environments.

INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING (2021)

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Article Engineering, Manufacturing

Encryption/decryption and microtarget capturing by pH-driven Janus microstructures fabricated by the same femtosecond laser printing parameters

Zhaoxin Lao et al.

Summary: This study presents a simple and flexible method to produce pH-sensitive Janus microactuators from a single material using laser printing, enabling reversible structural deformations and fast responses. The high flexibility of laser printing technique allows for the control of pillar heights and bending directions of microactuators, leading to various switchable ordered patterns and complex structures. The potential applications of this method in information encryption/decryption and microtarget capturing are also explored.

INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING (2021)

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Article Materials Science, Multidisciplinary

Reversible data encryption-decryption using a pH stimuli-responsive hydrogel

Hongjing Wen et al.

Summary: In this work, a reversible data encryption-decryption technique based on a pH-responsive hydrogel is reported, where the pH channel is employed for data manipulation. Encoding of data is achieved by pre-doping the hydrogel with silver ions and directly writing and patterning silver nanodots on the hydrogel platform. The reversible sub-diffraction limit data encryption is accomplished by selectively imposing acid and alkali stimulations, offering a potential solution for optical storage, multiplexed data manipulation, and optical data security.

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MICROMACHINES (2014)

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Review Physics, Applied

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APPLIED PHYSICS REVIEWS (2014)

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Article Chemistry, Physical

Periodical structures induced by femtosecond laser on metals in air and liquid environments

Catalina Albu et al.

APPLIED SURFACE SCIENCE (2013)

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Review Optics

Three-dimensional optical laser lithography beyond the diffraction limit

Joachim Fischer et al.

LASER & PHOTONICS REVIEWS (2013)

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Article Optics

Three-dimensional multi-photon direct laser writing with variable repetition rate

Joachim Fischer et al.

OPTICS EXPRESS (2013)

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Review Physics, Multidisciplinary

Femtosecond-laser ablation dynamics of dielectrics: basics and applications for thin films

P. Balling et al.

REPORTS ON PROGRESS IN PHYSICS (2013)

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Article Multidisciplinary Sciences

Three-dimensional deep sub-diffraction optical beam lithography with 9 nm feature size

Zongsong Gan et al.

NATURE COMMUNICATIONS (2013)

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Article Chemistry, Multidisciplinary

Dynamically Tunable Protein Microlenses

Yun-Lu Sun et al.

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION (2012)

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Article Materials Science, Multidisciplinary

Size distribution control of metal nanoparticles using femtosecond laser pulse train: a molecular dynamics simulation

Xin Li et al.

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING (2012)

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Article Optics

Ultrafast laser-written dual-wavelength waveguide laser

Martin Ams et al.

OPTICS LETTERS (2012)

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Article Materials Science, Multidisciplinary

Continuous wave ridge waveguide lasers in femtosecond laser micromachined ion irradiated Nd:YAG single crystals

Yuechen Jia et al.

Optical Materials Express (2012)

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Article Chemistry, Multidisciplinary

Multiphoton photoresists giving nanoscale resolution that is inversely dependent on exposure time

Michael P. Stocker et al.

NATURE CHEMISTRY (2011)

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Article Optics

Channel waveguide lasers in Nd:GGG crystals fabricated by femtosecond laser inscription

Chao Zhang et al.

OPTICS EXPRESS (2011)

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Article Multidisciplinary Sciences

Geometry and Mechanics in the Opening of Chiral Seed Pods

Shahaf Armon et al.

SCIENCE (2011)

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Article Chemistry, Multidisciplinary

Ferrofluids for Fabrication of Remotely Controllable Micro-Nanomachines by Two-Photon Polymerization

Hong Xia et al.

ADVANCED MATERIALS (2010)

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Article Engineering, Electrical & Electronic

Morphology and Thermal Stability of Fiber Bragg Gratings for Sensor Applications Written in H2-Free and H2-Loaded Fibers by Femtosecond Laser

Changrui Liao et al.

IEEE SENSORS JOURNAL (2010)

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Review Chemistry, Multidisciplinary

Designable 3D nanofabrication by femtosecond laser direct writing

Yong-Lai Zhang et al.

NANO TODAY (2010)

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Article Biochemistry & Molecular Biology

Mechanical and electrical anisotropy in Mimosa pudica pulvini

Alexander G. Volkov et al.

PLANT SIGNALING & BEHAVIOR (2010)

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Article Physics, Applied

Evanescent field at nanocorrugated dielectric surface

S. N. Volkov et al.

APPLIED PHYSICS LETTERS (2009)

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Article Physics, Applied

On the role of surface plasmon polaritons in the formation of laser-induced periodic surface structures upon irradiation of silicon by femtosecond-laser pulses

Joern Bonse et al.

JOURNAL OF APPLIED PHYSICS (2009)

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Article Multidisciplinary Sciences

Hygromorphs: from pine cones to biomimetic bilayers

E. Reyssat et al.

JOURNAL OF THE ROYAL SOCIETY INTERFACE (2009)

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Review Multidisciplinary Sciences

Biomaterial systems for mechanosensing and actuation

Peter Fratzl et al.

NATURE (2009)

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Article Optics

Regular subwavelength surface structures induced by femtosecond laser pulses on stainless steel

Litao Qi et al.

OPTICS LETTERS (2009)

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Article Materials Science, Multidisciplinary

Damage in materials following ablation by ultrashort laser pulses: A molecular-dynamics study

Delphine Bouilly et al.

PHYSICAL REVIEW B (2007)

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Article Materials Science, Multidisciplinary

Theoretical studies of ultrafast ablation of metal targets dominated by phase explosion

J. Yang et al.

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING (2007)

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Article Multidisciplinary Sciences

The role of wheat awns in the seed dispersal unit

Rivka Elbaum et al.

SCIENCE (2007)

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Article Physics, Applied

Improving spatial resolution of two-photon microfabrication by using photoinitiator with high initiating efficiency

Jin-Feng Xing et al.

APPLIED PHYSICS LETTERS (2007)

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Article Optics

1.5 μm single longitudinal mode waveguide laser fabricated by femtosecond laser writing

G. Della Valle et al.

OPTICS EXPRESS (2007)

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Article Physics, Applied

Reduction in feature size of two-photon polymerization using SCR500

Dengfeng Tan et al.

APPLIED PHYSICS LETTERS (2007)

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Article Materials Science, Multidisciplinary

Ultrafast processes for bulk modification of transparent materials

Kazuyoshi Itoh et al.

MRS BULLETIN (2006)

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Article Chemistry, Multidisciplinary

Control over the crystalline state of sapphire

Saulius Juodkazis et al.

ADVANCED MATERIALS (2006)

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Article Thermodynamics

Improved two-temperature model and its application in ultrashort laser heating of metal films

L Jiang et al.

JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME (2005)

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Article Materials Science, Multidisciplinary

Formation of nanogratings on the surface of a ZnSe crystal irradiated by femtosecond laser pulses

TQ Jia et al.

PHYSICAL REVIEW B (2005)

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Review Physics, Applied

Three-dimensional micro- and nano-fabrication in transparent materials by femtosecond laser

Y Shimotsuma et al.

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS (2005)

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Article Chemistry, Multidisciplinary

Three-dimensional spiral-architecture photonic crystals obtained by direct laser writing

KK Seet et al.

ADVANCED MATERIALS (2005)

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Article Physics, Applied

Improved spatial resolution and surface roughness in photopolymerization-based laser nanowriting

K Takada et al.

APPLIED PHYSICS LETTERS (2005)

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Article Physics, Applied

Ablation of metals by ultrashort laser pulses

NN Nedialkov et al.

JOURNAL OF PHYSICS D-APPLIED PHYSICS (2004)

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Article Materials Science, Multidisciplinary

Timescales in the response of materials to femtosecond laser excitation

B Rethfeld et al.

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING (2004)

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Article Chemistry, Physical

The effect of damage accumulation behaviour on ablation thresholds and damage morphology in ultrafast laser micro-machining of common metals in air

PT Mannion et al.

APPLIED SURFACE SCIENCE (2004)

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Article Optics

Wavelength division with three-dimensional couplers fabricated by filamentation of femtosecond laser pulses

W Watanabe et al.

OPTICS LETTERS (2003)

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Article Optics

Femtosecond laser-induced two-photon polymerization of inorganic-organic hybrid materials for applications in photonics

J Serbin et al.

OPTICS LETTERS (2003)

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Article Physics, Multidisciplinary

Ablation of solids under femtosecond laser pulses

D Perez et al.

PHYSICAL REVIEW LETTERS (2002)

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Review Chemistry, Physical

Inducing and probing non-thermal transitions in semiconductors using femtosecond laser pulses

SK Sundaram et al.

NATURE MATERIALS (2002)

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Article Chemistry, Physical

Phase explosion under ultrashort pulsed laser ablation: modeling with analysis of metastable state of melt

NM Bulgakova et al.

APPLIED SURFACE SCIENCE (2002)

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Article Physics, Multidisciplinary

Surface charging and impulsive ion ejection during ultrashort pulsed laser ablation

R Stoian et al.

PHYSICAL REVIEW LETTERS (2002)

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Review Physics, Multidisciplinary

Selected problems of laser ablation theory

SI Anisimov et al.

PHYSICS-USPEKHI (2002)

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Article Engineering, Multidisciplinary

Laser-induced breakdown and damage in bulk transparent materials induced by tightly focused femtosecond laser pulses

CB Schaffer et al.

MEASUREMENT SCIENCE AND TECHNOLOGY (2001)

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Article Multidisciplinary Sciences

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

S Kawata et al.

NATURE (2001)

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Article Chemistry, Physical

Laser-induced ion emission from dielectrics

M Henyk et al.

APPLIED SURFACE SCIENCE (2000)

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Article Chemistry, Physical

Electron and lattice dynamics following optical excitation of metals

J Hohlfeld et al.

CHEMICAL PHYSICS (2000)

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