Article
Chemistry, Physical
Jinwoo Lee, Yeongju Jung, MinJae Lee, June Sik Hwang, Jiang Guo, Wooseop Shin, JinKi Min, Kyung Rok Pyun, Huseung Lee, Yaerim Lee, Junichiro Shiomi, Young-Jin Kim, Byung-Wook Kim, Seung Hwan Ko
Summary: Butterfly wings have evolved complex nanostructures that give them excellent optical properties and the ability to regulate temperature. Inspired by this, scientists have developed a biomimetic film that mimics the nanostructure of butterfly wings, demonstrating outstanding radiative cooling and structural coloring functionalities.
NANOSCALE HORIZONS
(2022)
Article
Chemistry, Physical
Sandra Fusco, Stefano Luigi Oscurato, Marcella Salvatore, Francesco Reda, Sara Moujdi, Michael De Oliveira, Antonio Ambrosio, Roberto Centore, Fabio Borbone
Summary: Real-time manipulation of light in a diffractive optical element can be achieved by using an azomaterial with a surface that can be reconfigured through light-induced mass transport. The speed and control of photopatterning/reconfiguration rely on the material's photoresponsiveness and the extent of mass transport, which can be improved by increasing the refractive index (RI) of the optical medium.
CHEMISTRY OF MATERIALS
(2023)
Article
Optics
Zhuofei Gan, Hongtao Feng, Liyang Chen, Siyi Min, Chuwei Liang, Menghong Xu, Zijie Jiang, Zhao Sun, Chuying Sun, Dehu Cui, Wen-Di Li
Summary: This work presents a lithographic approach combining interference lithography (IL) and grayscale-patterned secondary exposure (SE) for wafer-scale arbitrary modulation of feature size distribution. By utilizing high-throughput IL and grayscale-patterned SE, uniform nanopatterns with <5% linewidth variation and wafer-scale structural color painting with gradient grayscale color were successfully achieved.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Review
Physics, Applied
Oliver Breunig, Yoichi Ando
Summary: Topological insulators are unique materials that result in unconventional quantum phenomena. To observe these phenomena experimentally, sophisticated devices are required. This Technical Review discusses various physics effects that can be observed in carefully fabricated devices, including topological superconductivity, quantum anomalous Hall states, spintronic functionalities and topological mesoscopic physics.
NATURE REVIEWS PHYSICS
(2022)
Article
Chemistry, Physical
Anna Kozanecka-Szmigiel, Aleksandra Hernik, Katarzyna Rutkowska, Jolanta Konieczkowska, Ewa Schab-Balcerzak, Dariusz Szmigiel
Summary: This research reports on the holographic inscription of a surface relief grating with a maximum depth of 1.7 µm in a custom synthesized glassy azo polymer. The deformed polymer structure has a unique dual effect on incoming light beams of different diameters, enabling continuous tuning of diffraction efficiencies and reshaping the intensity profiles.
Article
Chemistry, Multidisciplinary
Edgar Gutierrez-Fernandez, Tiberio A. Ezquerra, Aurora Nogales, Esther Rebollar
Summary: Laser-based methods are effective in fabricating surface micro- and nanostructures, particularly through the formation of LIPSS for linear structures. By using a combination of pulses at different wavelengths and polarization orientations, different geometries of nanostructures can be obtained.
Article
Polymer Science
Nadiyah Rashed Al Atmah, Willian R. Caliman, Agnieszka Pawlicka, Ribal Georges Sabat, Jean-Michel Nunzi
Summary: In this study, homogeneous thin films of chitosan-PADA dye were deposited on glass substrates using spin-coating method. ATR-FTIR spectroscopy and UV-VIS spectroscopy were performed to characterize the films, revealing hydrogen bonding and the formation of surface relief grating (SRG). AFM confirmed the existence of SRG and measured the grating depth.
Article
Multidisciplinary Sciences
Jinseong Ahn, Junyong Park
Summary: This research systematically predicts the influence of relief height of a phase grating on the Talbot interference pattern under two-photon interference lithography through optical simulations. The study reveals the design error of the relief height of the phase grating inferred by the scalar approximation and presents the optimal condition that satisfies the pi-phase shift inferred by the full-vectorial numerical solution.
ADVANCED THEORY AND SIMULATIONS
(2022)
Article
Engineering, Aerospace
Hanshin Lee, Menelaos K. Poutous
Summary: This study reports the fabrication of a binary-phase astronomical diffraction grating embedded in a quartz substrate using reactive ion plasma etching. The grating exhibits high diffraction efficiency and is suitable for a wide range of spectroscopic applications, especially in challenging astronomical observations.
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
(2022)
Article
Optics
Florian Bienert, Thomas Graf, Marwan Abdou Ahmed
Summary: In this paper, a theoretical investigation is conducted on deliberately bending the substrate during laser interference lithography to compensate for the period chirp. By optimizing the surface geometry and using an off-center placement of the substrate with a fourth-order polynomial, effective compensation for the period chirp is achieved.
Article
Physics, Applied
Oshri Rabinovich, Ariel Epstein
Summary: The study introduces a new method using metagratings to shape nonradiative field patterns in transmission, generating desired reactive near-field profiles with deep subwavelength features. This approach can directly produce fabrication-ready printed-circuit-board configurations, allowing versatile control of reactive near fields.
APPLIED PHYSICS LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Isabel Allegro, Victor Bonal, Emil R. Mamleyev, Jose M. Villalvilla, Jose A. Quintana, Qihao Jin, Maria A. Diaz-Garcia, Uli Lemmer
Summary: For the first time, a perovskite film has been successfully nanopatterned by thermal nanoimprint lithography (NIL) using a low-cost polymeric stamp. This approach allows for cost-effective fabrication of high-quality distributed feedback (DFB) lasers compatible with different perovskite compositions and photonic nanostructures.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Zewei Yi, Yuan Guo, Rujia Hou, Zhaoyu Zhang, Yuhong Gao, Chi Zhang, Wei Xu
Summary: In this study, the orientation selectivity of tetrapyridyl-substituted porphyrins in response to various local molecular environments in artificially constructed molecular Klotski puzzles on Au(111) is reported. The results demonstrate the essential role of local molecular environments in directing single-molecule orientations.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Optics
Cheng Luo, Qisong Li, Yi Liu
Summary: In this study, a novel microstructure was formed on the surface of crystalline ZnO in ambient air by a single femtosecond laser beam. The structure had a controlled period of 2-6 micrometers and was independent of laser polarization. The formation was attributed to mechanical cracking induced by multiple-cyclic heating from linear absorption of the femtosecond pulses.
Article
Optics
Sh Golghasemi Sorkhabi, S. Ahmadi-Kandjani, F. Cousseau, S. Dabos-Seignon, M. Loumaigne, E. Ortyl, S. Zielinska, R. Barille
Summary: The optical characterization of transparent and stretchable patterned surfaces replicated from the fabrication of quasicrystal structures on azopolymer thin films is presented. The microscopic elongation of nanocavities induced by macroscopic stretchings of the elastomeric quasicrystal replication is characterized via optical diffraction, and an original numerical method is presented to reconstruct the structured surface deduced from the optical diffraction measurements. The measurements show drastic topologic changes on the surface, which could be ingeniously used for creating actionable structured surfaces or nanoparticles trapping surfaces.
Article
Physics, Multidisciplinary
P. Hilden, E. Ilina, M. Kaivola, A. Shevchenko
Summary: It has been discovered that the group velocity of an optical beam can be adjusted by designing the angular dispersion, including achieving subluminal and superluminal propagation as well as periodic oscillation of local group velocities. These findings are of great importance to scientists in the fields of optics, optical interferometry, and more.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
A. Lyasota, C. Jarlov, M. Nyman, A. Miranda, M. Calic, B. Dwir, A. Rudra, A. Shevchenko, E. Kapon
Summary: The radiation properties of pointlike sources like molecules or semiconductor quantum dots can be modified by changing the surrounding photonic environment, which is a core concept in cavity quantum electrodynamics (CQED). Quantum dots in photonic crystal microcavities have been used as a model system to study these effects and for creating efficient single-photon quantum emitters. Recent research has shown that quantum interference of exciton recombination paths through cavity and free-space modes can change the radiation significantly. This study reports experimental evidence of this effect in the emission spectra of quantum dots placed in specific locations within a photonic crystal cavity, showing asymmetry in the polarization-resolved emission spectra depending on the quantum dot position.
Article
Optics
Panu Hilden, Matti Kaivola, Andriy Shevchenko
Summary: This paper presents a theoretical framework for generating light sheets and introduces a practical method. The transverse profile of the light sheets can be shaped by modifying the spectrum of the light. This research is significant for beam-engineering technology and its applications.
Article
Optics
Elena Ilina, Panu Hilden, Matti Kaivola, Andriy Shevchenko
Summary: A variety of transversely accelerating optical beams have been extensively studied, while longitudinal acceleration of optical beams in free space has been less explored. In this work, two-component continuous wave Bessel beams with extremely high longitudinal acceleration are created, and the experimental results agree well with the theoretical predictions.
Article
Physics, Applied
Somendu Maurya, Radoslaw Kolkowski, Matti Kaivola, Andriy Shevchenko
Summary: The study explores the possibility of suppressing crosstalk between dielectric waveguides by using higher-order modes, showing that crosstalk between closely spaced waveguides can be essentially eliminated. This can lead to further miniaturization of photonic integrated circuits.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Applied
Radoslaw Kolkowski, Tommi K. Hakala, Andriy Shevchenko, Mikko J. Huttunen
Summary: Optical metasurfaces have revolutionized light manipulation and opened up new opportunities in optics and photonics. Nonlocal metasurfaces, which utilize collective responses of nanoscale building blocks, show great potential in enhancing and controlling nonlinear optical phenomena. This article provides an overview of the principles and functionality of nonlocal metasurfaces, covering multiple scattering, radiation damping, quality factor, local-field enhancement, and temporal dynamics. Computational examples illustrate important aspects, and prospects for future research are discussed.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Panu Hilden, Andriy Shevchenko
Summary: A common drawback of high-resolution optical imaging systems is a short depth of field. In this work, we propose a solution by introducing a ring-shaped aperture in the front focal plane of the second lens in a 4f-type imaging system. The aperture creates non-diverging Bessel-like beams, resulting in significantly extended depth of field. We demonstrate that only incoherent light is capable of forming sharp and non-distorted images with extraordinarily long depth of field.
Article
Physics, Nuclear
Evgeniia Ponomareva, Andriy Shevchenko
Summary: Plasma waves are used to create efficient and small-sized electron accelerators. To solve the problems of transverse spreading and loss of synchronization in laser-induced wakefields, this study proposes the use of a two-wavelength structured laser beam with designed angular dispersion and adjustable group velocity to efficiently excite a nondiverging plasma wave. This approach allows for the generation of an electron bunch with low transverse spread and high average acceleration gradients.
PHYSICAL REVIEW ACCELERATORS AND BEAMS
(2023)
Article
Physics, Multidisciplinary
Xiaorun Zang, Andriy Shevchenko
Summary: This study explores further enhancement of near-field enhancement by placing a metal-dielectric slab waveguide beneath the lattice of metal nanoparticles. Numerical simulations show that this approach can significantly increase the near-field intensity, providing an 80-fold increase over single-particle plasmon resonance and a 7-fold increase over lattice-resonance enhancement. This enhancement mechanism can be used to design extraordinarily efficient nonlocal optical metasurfaces for various applications.
NEW JOURNAL OF PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Radoslaw Kolkowski, Andriy Shevchenko
Summary: Resonant optical structures are widely used in science and technology, but their Q factors can be reduced if some parts exhibit optical absorption. We propose a method to create a nonradiating and absorption-free bound state in the continuum (BIC) by coupling a lossy mode of the structure to two independent lossless modes. This BIC has theoretically unlimited Q factors despite interaction with an absorbing structure. Using this mechanism, we design a plasmonic metasurface with Q factors close to 10^7 in the visible spectral range. This mechanism can be applied to engineer ultrahigh-Q resonances in various systems containing absorbing structures.
Article
Physics, Multidisciplinary
Andriy Shevchenko, Vishal Vashistha, Markus Nyman, Matti Kaivola
PHYSICAL REVIEW RESEARCH
(2020)
Article
Optics
M. Nyman, M. Kaivola, A. Shevchenko
Article
Optics
Somendu Maurya, Markus Nyman, Matti Kaivola, Andriy Shevchenko
