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Article
Multidisciplinary Sciences
Yang Chen et al.
Summary: Photons with spin angular momentum possess intrinsic chirality, which has a wide range of applications. Current experimental attempts rely on false/extrinsic chirality, but this study has achieved true/intrinsic chiral response using resonant metasurfaces, achieving near-unity circular dichroism and a high quality factor for visible frequencies.
Article
Engineering, Electrical & Electronic
Qian-Qian Li et al.
Summary: In this article, a chiral metastructure absorber (CMMA) is combined with a circularly polarized (CP) antenna array based on a sequential-phase feed network to improve the axial ratio beamwidth (ARBW) by absorbing cross-polarization. The proposed CMMA unit achieves good circular dichroism at 4.9-5.2 GHz, improving the ARBW of the antenna in this frequency band. The 3-D form of the feed network reduces coupling with the radiation patches, resulting in higher gain. The measured impedance bandwidth is 80% (2.81-6.81 GHz), AR bandwidth is 70.8% (3.68-7.22 GHz), and peak gain is 15.28 dBi.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Materials Science, Multidisciplinary
Artur Movsesyan et al.
Summary: This study demonstrates the possibility of inducing chiral shapes in nanocrystals in a diluted solution using circularly polarized light (CPL). The chiral patterns are created by the electromagnetic retardation effect, with the formation of chiral hot-spot patterns on anisotropic nanocrystals with sharp edges and tips. 2D chirality is more easily induced than 3D chirality, and imprinting 3D chirality on spherical nanocrystals is not possible. Linearly polarized light (LPL) can create chiral nanocrystals on a substrate. This study provides the principles for using CPL and LPL illuminations to create chiral nanostructures.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jing Wang et al.
Summary: Chiral plasmonic nanostructures have attracted attention for their strong optical response and superchiral near-fields. This study demonstrates that chiral cavity plasmon resonances can enhance the chiral optical response of film-coupled chiral Au helicoid nanoparticles. Furthermore, the chiral cavity mode can modulate the emission polarization of a point electric dipole, enabling the emission of circularly polarized photons. These findings provide a promising platform for advanced chiral optical devices.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Martin Kartau et al.
Summary: Chiral nanophotonic platforms enhance both the asymmetric properties and intensities of near fields, enabling optical measurements with enantiomeric discrimination at a higher detection level than conventional chirally sensitive spectroscopic methods. This study demonstrates the use of surface enhanced Raman spectroscopy (SERS) as a local probe to discriminate chiral helicoid nanoparticles on chiral metafilms. The intensity of electromagnetic hotspots generated by matched combinations of helicoid and metafilms is higher, while mismatched combinations result in cooler electromagnetic hotspots. SERS is used to detect the enantiomeric dependency of hotspot intensity, allowing the distinction between different electromagnetic environments of plasmonic diastereomers.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Silvia Rotta Loria et al.
Summary: Ultrafast plasmonics is gaining attention for exploring new plasmonic materials that overcome the limitations of noble metals. Titanium nitride (TiN) is particularly notable due to its refractory properties and extremely fast electron-lattice cooling time (<100 fs) compared to gold (approximately 1 ps). However, the exact explanation for the ultrafast and giant optical response of TiN-based materials under femtosecond laser excitation is still unknown.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Jean-Francois Bryche et al.
Summary: Thermoplasmonics has gained increasing attention for generating nanoscale heat sources using photothermal effects in plasmonic nanoparticles. By exciting gold nanoparticles with ultrashort light pulses, high-speed light management and nanoscale heat-sensitive chemical reaction control can be achieved. This study investigates the non-uniform thermal energy distribution in cross-shaped nanostructures using femtosecond transient spectroscopy and a thermooptical numerical model. The results show that the polarization of the excitation light can control heat distribution in the nanostructures, and nonthermal electron ballistic displacement is crucial in fast transient heat dynamics models.
Article
Chemistry, Medicinal
Chidambar Kulkarni et al.
Summary: When irradiating a molecular material with pure circularly polarized light, a certain handedness can be imprinted into the material. To study the mechanism and kinetics of this process, a new chiroptical tool has been developed to monitor the circular polarization of the incident light after transmission through the photoactive layer. Kinetic Monte Carlo simulations on a model for the active material support the interpretation of a transient minimum in the degree of circular polarization as a nematic transient state during photo-inversion of a cholesteric organization.
Editorial Material
Physics, Applied
Filippo Capolino et al.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Denis A. B. Therien et al.
Summary: This research focuses on the properties and applications of metamaterials with localized surface plasmon resonances. The position of resonances was tuned by adjusting the geometric parameters of spiral metastructures, and the near-field distribution of optical resonances was calculated. The vibrational circular response of the spiral structures was measured experimentally.
ISRAEL JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Andrea Schirato et al.
Summary: The transient optical response of plasmonic nanostructures is important for studying light harvesting, photocatalytic processes, nonlinear nanophotonics, and all-optical modulation. However, under a nonperturbative excitation regime, the correspondence between the temporal evolution of the dynamic optical signal and the photoexcited hot electrons is not valid.
Article
Physics, Multidisciplinary
Andrea Schirato et al.
Summary: The study focuses on the light-induced hot carriers and optical nonlinearity in nanostructures, particularly on the spatial inhomogeneities of electrons in nanoantennas and their impact on nanophotonic configurations.
NEW JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Andrea Schirato et al.
Summary: Optical metasurfaces offer a promising platform for nanoscale light manipulation, and can be reconfigured by tuning the polarization of the excitation pulse.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Larousse Khosravi Khorashad et al.
Summary: This study systematically investigates the temperature dynamics of hot electrons in ultrathin gaps, and quantifies and analyzes them using the two-temperature model and nonlocal model approach. The temperature dependent material properties derived from the study are used to examine the ultrafast transient nonlinear modification in the absorption spectrum of tunable nanophotonic absorbers, as well as the damage threshold under pulsed laser illuminations.
Article
Multidisciplinary Sciences
Ryeong Myeong Kim et al.
Summary: This study identified the enantioselective characteristics of collective resonances in assembled 2D crystals. These resonances shift in opposite directions depending on the handedness of the analyte, maximizing the modulation of collective circular dichroism.
Article
Multidisciplinary Sciences
Shan Zhou et al.
Summary: This study demonstrates the self-assembly of tetrahedral gold nanoparticles into chiral superlattices with different connection patterns on solid substrates. The chiral superlattices show strong mirror asymmetry and chiral properties. The thermodynamic equilibrium of the assembly is controlled by van der Waals and electrostatic interactions between nanoparticles, and the chirality can be fine-tuned by adjusting the corner-to-edge connections.
Article
Physics, Multidisciplinary
Nicola Mayer et al.
Summary: This study investigates the excitation of chiral superpositions in atoms and the methods for detecting their chirality. Customized light fields are used to achieve this excitation in both weak-field and strong-field regimes, and the chirality is detected through photoelectron circular dichroism and chiral measures on the photoelectron wave packet.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Sourav Rej et al.
Summary: In this study, we successfully fabricated TiN nanobars with high carrier density using a two-step method based on the synthesis of TiO2 nanowires and subsequent high temperature annealing in an ammonia flow. The resulting nanobars showed a rich set of optical resonances in the visible to mid-infrared (MIR) range. TiN nanobars decorated with Pt co-catalyst nanocrystals exhibited enhanced photocatalytic activity for hydrogen evolution under near-infrared excitation, and also demonstrated strong surface enhanced infrared absorption (SEIRA) effect for the detection of furfural molecular vibrations in the MIR region.
Article
Nanoscience & Nanotechnology
Oscar Avalos-Ovando et al.
Summary: This Perspective discusses the latest developments in chiral nanocrystals and metastructures, focusing on plasmonic nanostructures. Topics include polarization-sensitive photocatalysis, chiral bioconjugates, chiral growth, and theoretical challenges in nanoscience.
Article
Optics
Zhonglei Shen et al.
Summary: A concise and general design principle is proposed to develop out-of-plane reflective chiral metasurfaces with maximum circular dichroism. The metasurfaces are fabricated using a simple and scalable three-dimensional printing technique. The experimental results validate the stability and strong chiroptical responses of the proposed metasurfaces. These findings have the potential to overcome the difficulties in design, optimization, and fabrication, and provide promising applications in emerging THz technologies.
LASER & PHOTONICS REVIEWS
(2022)
Article
Multidisciplinary Sciences
Xudong Zhang et al.
Summary: Ultracompact sources of circularly polarized light are important for both classical and quantum optical information processing. The efficient and controllable emission of circularly polarized light from resonant metasurfaces using the physics of chiral quasi-bound states in the continuum has been demonstrated, promising multiple applications in nanophotonics and quantum optics.
Review
Optics
Tianji Liu et al.
Summary: This review discusses the physics and functionalities of nanophotonic structures with broken symmetries for controlling thermal emission, highlighting the role of symmetries in increasing the degree of freedom in systems and providing opportunities for novel applications. The article also outlines various physical phenomena, interesting applications, and future developments in the field.
Article
Chemistry, Multidisciplinary
Sergey S. Kharintsev et al.
Summary: This study investigates the tunable optical heating of plasmonic nanostructures under moderate light intensity by using a waveguide heatsink. The research demonstrates programmable non-uniform temperature profiles, which is significant for the development of tunable thermoplasmonics.
Review
Physics, Applied
Yang Chen et al.
Summary: Nanoscopic chiroptics studies spin-dependent asymmetric light-matter interactions at the nanoscale, with asymmetry stemming from intrinsic properties of materials, structures, or light. With the advent of low-dimensional materials platforms, nanoscopic chiroptics has expanded from far field to near field, and across spatial, momentum, and integrated spatial-momentum dimensions, revealing new physical mechanisms and applications related to chiral effects.
NATURE REVIEWS PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Sven H. C. Askes et al.
Summary: Plasmonic photochemistry is driven by a rich collection of mechanisms such as near-field effects, hot charge carriers, energy transfer, and thermal effects, often achieved through continuous wave illumination. By judiciously choosing nanoreactor geometry and materials, direct thermal imprint of plasmonic optical absorption hotspots onto the lattice can be achieved with high fidelity. Transition metal nitrides show ideal material properties for unprecedented peak temperatures and internal heat gradients, outperforming noble metals by up to ten thousand times in pulsed photothermal chemical conversion, opening up a completely unexplored realm of nano-photochemistry.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Andrea Schirato et al.
Summary: This paper investigates the hot-electron dynamics in nanostructured materials upon irradiation with Is-laser pulses and explores the opportunities for ultrafast diffraction management through the inhomogeneous evolution of hot carriers. The design of a highly symmetric plasmonic metagrating capable of transient symmetry breaking and the control of recovery time for symmetric configurations are discussed in detail.
Article
Chemistry, Physical
Romain Rouxel et al.
Summary: When a metal nanoparticle absorbs light, it undergoes a series of relaxation processes that lead to transient modifications in its optical response. By using time-resolved spectroscopy experiments, it was shown that the transient optical response could be attributed to internal thermalization processes within the nanoparticle, and the effects of electron and ionic lattice heating were quantitatively studied. The study demonstrated the possibility of selectively probing electronic or lattice dynamics by choosing specific probe wavelengths, and showed that the timedependent spectral shape of transient extinction cross-section changes was successively dominated by electron and lattice heating effects.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Multidisciplinary Sciences
M. Saad Bin-Alam et al.
Summary: Plasmonic nanostructures show great potential in ultra-thin sub-wavelength devices, but are often limited by resistive losses. By utilizing surface lattice resonances (SLRs), researchers have achieved a high quality-factor metasurface in the telecommunication band, offering exciting possibilities for manipulating incident light fields and creating flexible wavelength-scale devices.
NATURE COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Meng-Ju Yu et al.
Summary: Research has shown that a titanium nitride metasurface absorber demonstrates broadband absorption with over 92% average absorption in the wavelength range of 400 to 750 nm, attributed to localized surface plasmon resonance. By integrating this technology with a polymer photocatalyst, a 300% increase in hydrogen evolution rate was observed due to enhanced rates of light absorption, carrier separation, and hot-carrier transfer, providing a new approach for high-efficiency solar energy harvesting systems.
Article
Optics
Patrick O'Keeffe et al.
Summary: This study focuses on the analysis of nonthermal electrons generated by plasmonic nanostructures upon light excitation, highlighting the challenge of separating nonthermal and thermal electron contributions in femtosecond transient absorption spectroscopy (FTAS). By introducing a combined approach involving post-processing of FTAS measurements guided by a simplified semiclassical model, the purely nonthermal contribution to pump-probe experimental data for 2D arrays of gold nanoellipsoids was successfully isolated. This approach reveals the close relationship between electron energy and probe photon energy during ultrafast electron thermalization, shedding new insights on the transient optical response of gold nanostructures and aiding in the development of optimized plasmonic configurations for nonthermal electron generation.
LASER & PHOTONICS REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Patrick Spaeth et al.
Summary: Researchers used photothermal microscopy to measure the circular dichroism of single gold nanospheres, adjusting modulation parameters through simulation to obtain a virtually artifact-free CD signal; the study found that the chirality of nominally achiral gold nanoparticles immersed in a chiral liquid was not affected.
Article
Chemistry, Multidisciplinary
Shuai Zu et al.
Summary: By studying gold nanorods, the spatiotemporal origin of plasmonic chiroptical responses was revealed, promoting a full understanding of the ultrafast chiral origin in complex nanostructures. This research opens a way to design chiroptical nanophotonic devices for spatiotemporal control of chiral light-matter interactions.
Article
Chemistry, Multidisciplinary
Maria Sygletou et al.
Summary: The femtosecond evolution of the electronic temperature of laser-excited gold nanoparticles was measured using ultrafast time-resolved photoemission spectroscopy induced by extreme-ultraviolet radiation pulses. The results provided a direct and unambiguous picture of the ultrafast electron-gas dynamics, contributing to the refinement of existing models and deeper understanding of the role of hot electrons in technological applications.
Article
Materials Science, Multidisciplinary
Devin B. O'Neill et al.
Summary: This study elucidated the light-induced relaxation processes in transition metal nitride nanoparticles, demonstrating their ability to rapidly convert absorbed photons into heat without the presence of hot charge carriers. These findings suggest potential benefits of transition metal nitrides over noble metals in the field of plasmonic photothermal catalysis.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Antonio Ferraro et al.
Summary: Plasmonic nanoheaters can produce significant local heating when excited by a specific laser wavelength, with even more sensitivity achieved by coating them with a thick layer of doped polymer. Modulation of excitation allows fine control of the thermal response, making them useful for applications in nano medicine and nano chemistry.
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Andreas Horrer et al.
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P. Bresson et al.
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Harmen J. Sielcken et al.
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(2019)
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Rui-Qi Piao et al.
ADVANCED THEORY AND SIMULATIONS
(2019)
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Qiuqun Liang et al.
MODERN PHYSICS LETTERS B
(2018)
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Xiang-Tian Kong et al.
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Koichiro Saito et al.
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NATURE COMMUNICATIONS
(2018)
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SCIENTIFIC REPORTS
(2018)
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JOURNAL OF MATERIALS CHEMISTRY C
(2018)
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Shun Hashiyada et al.
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Alberto Naldoni et al.
ADVANCED OPTICAL MATERIALS
(2017)
Review
Materials Science, Multidisciplinary
Joel T. Collins et al.
ADVANCED OPTICAL MATERIALS
(2017)
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Multidisciplinary Sciences
Keith W. Bentley et al.
NATURE COMMUNICATIONS
(2016)
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Chemistry, Multidisciplinary
Jianhui Liao et al.
CHEMICAL SOCIETY REVIEWS
(2015)
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Chemistry, Physical
Urcan Guler et al.
FARADAY DISCUSSIONS
(2015)
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Chemistry, Multidisciplinary
Ryan Tullius et al.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2015)
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Nanoscience & Nanotechnology
Mark L. Brongersma et al.
NATURE NANOTECHNOLOGY
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Nanoscience & Nanotechnology
Hayk Harutyunyan et al.
NATURE NANOTECHNOLOGY
(2015)
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Wei Li et al.
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FARADAY DISCUSSIONS
(2015)
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JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME
(2014)
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Materials Science, Multidisciplinary
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Gururaj V. Naik et al.
ADVANCED MATERIALS
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Tetsuya Narushima et al.
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(2013)
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Alexander O. Govorov et al.
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(2013)
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Urcan Guler et al.
Review
Chemistry, Multidisciplinary
Gregory V. Hartland
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(2011)
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E. Hendry et al.
NATURE NANOTECHNOLOGY
(2010)
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Yukie Yokota et al.
JOURNAL OF NANOPHOTONICS
(2007)
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Johan Grand et al.
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Chemistry, Physical
P. G. Etchegoin et al.
JOURNAL OF CHEMICAL PHYSICS
(2006)
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OL Muskens et al.
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C Hubert et al.
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J Hohlfeld et al.
