Article
Chemistry, Multidisciplinary
Yera Ye. Ussembayev, Noah De Witte, Xiaohong Liu, Alberto Belmonte, Tom Bus, Sjoukje Lubach, Filip Beunis, Filip Strubbe, Albert P. H. J. Schenning, Kristiaan Neyts
Summary: Liquid crystalline polymers are used to create miniature soft robots that can be controlled using light. This study focuses on the manipulation of photoresponsive polymers at the micrometer scale, specifically their rotation and speed control. By using a circularly polarized trapping laser, the polymer particles exhibit uni- and bidirectional rotation, with the rotation rate determined by the optical torque. The angular speed can be controlled by small structural changes induced by UV light absorption. This research provides evidence of motion and speed control in light-responsive polymer particles and opens up possibilities for light-controlled rotary microengines at the micrometer scale.
Article
Materials Science, Multidisciplinary
Wongi Park, Hyewon Park, Yun-Seok Choi, Dong Ki Yoon
Summary: This study proposes an optical rotation-based color tuning method, which provides a wide range of color tunability using a controlled cholesteric liquid crystal and two polarizers. The color range can be manipulated by engineering the optical rotation of the liquid crystal film, resulting in the attenuation of unexpected light sources and improved visibility.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Wongi Park, Jongmin Lee, Moon Jong Han, Joanna Wolska, Damian Pociecha, Ewa Gorecka, Min-Kyo Seo, Yun-Seok Choi, Dong Ki Yoon
Summary: A photonic lattice is an efficient platform for exploring quantum phenomena, but traditional fabrication methods using conventional materials are costly and complex. This study demonstrates a simple and cost-effective fabrication method for a reconfigurable chiral photonic lattice using helical nanofilament liquid crystal phase and diffraction grating.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Seungmin Nam, Dahee Wang, Chaehyun Kwon, Sang Hyun Han, Su Seok Choi
Summary: Structural color can be produced by nanoperiodic dielectric structures using soft materials, and stretchable chiral photonic elastomers (CPEs) can self-organize into a helical nanostructure, with the chiral nanostructural color controlled by stretching. This study presents stretchable CPEs with simultaneous multicolor control, including electrical control, and demonstrates various device applications such as multiarrayed color binning and chameleon-like photonic e-skin. The ability to control the separation of biomimetic multicolors in stretchable photonic systems improves the functionality of potential photonic applications.
ADVANCED MATERIALS
(2023)
Article
Optics
Mingxing Li, Yueke Wang, Tian Sang, Hongchen Chu, Yun Lai, Guofeng Yang
Summary: This study proposes a heterostructure composed of ordinary-topological-ordinary photonic crystal slabs and observes two coupled edge states and two coupled corner states. Furthermore, a topological corner state is discovered. Experimental results demonstrate that the manipulation of photons can be more flexible using near-field scanning technique.
PHOTONICS RESEARCH
(2022)
Review
Materials Science, Multidisciplinary
Dan Qu, Orlando J. Rojas, Bing Wei, Eyal Zussman
Summary: This article provides an overview of the fundamental design principles, responsive mechanisms, and practical applications of responsive chiral photonic CNC materials. The changes in properties of these materials under different stimuli are discussed, and novel applications such as colorimetric sensors and photonic actuators are described.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Engineering, Mechanical
Wei Ding, Tianning Chen, Chen Chen, Dimitrios Chronopoulos, Jian Zhu, Badreddine Assouar
Summary: We report a planar chiral phononic crystal based on Thomson scattering that can open a broadband gap by discarding the local resonant sub-structure. By simplifying the material components, we lower the starting frequency while maintaining the width of the bandgap. This finding provides a new way to manipulate broadband elastic waves and validates Thomson scattering as a promising alternative approach for bandgap formation.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Optics
Bing Wang, Jiaqi Quan, Jianfei Han, Xiaopeng Shen, Hongwei Wu, Yiming Pan
Summary: This study synthesizes a photonic material of topological Floquet time crystals and experimentally observes its indicative period-2T beating. A single-particle picture is explicitly reconstructed of discrete time-crystalline phase and is revealed using an appropriately-designed photonic Floquet simulator the rigid period-doubling as a signature of the breakage of the discrete time-translational symmetry. The photonic Floquet time crystal is derived from a newly defined single-particle topological phase that can be extensively accessed by many pertinent nonequilibrium and periodically-driven platforms.
LASER & PHOTONICS REVIEWS
(2022)
Article
Optics
Yang Liu, Amol Choudhary, Guanghui Ren, Duk-Yong Choi, Alvaro Casas-Bedoya, Blair Morrison, Pan Ma, Thach G. Nguyen, Arnan Mitchell, Stephen J. Madden, David Marpaung, Benjamin J. Eggleton
Summary: This study demonstrates a circulator-free Brillouin photonic planar waveguide circuit using backward inter-modal Brillouin scattering (BIBS) to provide Brillouin processing capability in a multi-modal waveguide, conveniently allowing for the separation of pump and signal using passive integrated mode-selective filters. Experimentally demonstrated inter-optical-mode energy transfer with a significantly enhanced Brillouin gain coefficient, this on-chip BIBS circuit allows for independent routing of pump and signal waves showing resilience to cross talk.
LASER & PHOTONICS REVIEWS
(2021)
Article
Optics
Zi-Xuan Gao, Jing-Zun Liao, Fu-Long Shi, Ke Shen, Fei Ma, Min Chen, Xiao-Dong Chen, Jian-Wen Dong
Summary: This article demonstrates unidirectional bulk modes and robust edge modes in triangular photonic crystals. By changing the phase vortex of an input chiral source, dynamic unidirectional propagation of bulk modes at different valleys is observed. Unidirectional edge modes are also shown on the domain wall between two distinct triangular photonic crystals. In addition, robust edge modes around sharp corners are experimentally confirmed. This work paves the way for the realization of dynamic unidirectional photonic transport and robust valley transport in photonic crystals.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Guowei Li, Qun Yang, Kaustuv Manna, Yudi Zhang, Patrick Merz, Chandra Shekhar, Yang Zhang, Hua Lv, Anastasios Markou, Yan Sun, Claudia Felser
Summary: The study focuses on the enantiomeric processes in inorganic crystals, aiming to understand how homochirality develops in nature and chemical reactions. By growing B20 group PdGa single crystals with different chiral lattices, enantioselective recognition of 3,4-dihydroxyphenylalanine (DOPA) is achieved based on the orbital angular momentum (OAM) polarization. Results indicate that the adsorption energies of PdGa crystals and DOPA molecules differ depending on the pairing of O-2p orbital of DOPA with Pd-4d orbital of PdGa, providing a possible explanation for the emergence of chirality in nature.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Silvia Tacchi, Jorge Flores-Farias, Daniela Petti, Felipe Brevis, Andrea Cattoni, Giuseppe Scaramuzzi, Davide Girardi, David Cortes-Ortuno, Rodolfo A. Gallardo, Edoardo Albisetti, Giovanni Carlotti, Pedro Landeros
Summary: The band diagram of a chiral magnonic crystal composed of a ferromagnetic film and an array of heavy-metal nanowires with periodic Dzyaloshinskii-Moriya coupling is studied. Experimental evidence shows strong asymmetry of spin wave amplitude induced by modulated interfacial Dzyaloshinskii-Moriya interaction, resulting in nonreciprocal propagation. Flat spin-wave bands are observed at low frequencies in the band diagram. Depending on the perpendicular anisotropy, the spin-wave localization associated with the flat modes can occur in zones with or without Dzyaloshinskii-Moriya interaction.
Article
Optics
Christina Joerg, Sachin Vaidya, Jiho Noh, Alexander Cerjan, Shyam Augustine, Georg von Freymann, Mikael C. Rechtsman
Summary: Weyl points are point degeneracies in the momentum space of 3D periodic materials, associated with a quantized topological charge. This study experimentally observed the splitting of a quadratic Weyl point into two linear Weyl points in a 3D micro-printed photonic crystal. The theoretical analysis showed that this splitting occurs along high-symmetry directions in the Brillouin zone, which is important for the development of robust topological devices in the near-infrared.
LASER & PHOTONICS REVIEWS
(2022)
Article
Optics
Hongfei Wang, Biye Xie, Wei Ren
Summary: This study introduces a modified Haldane model that allows the coexistence of chiral and antichiral edge states in photonic crystals. By manipulating different parameters, the Berry curvatures of the system can be flexibly diffused, converged, or flipped, resulting in exotic topological interface/edge behaviors, including topological bound states with ideally zero dispersion. These findings have significant implications for developing reconfigurable integrated device applications in classical (quantum) information processing and photonic computing.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Wesley Flavell, Andreas Neophytou, Angela Demetriadou, Tim Albrecht, Dwaipayan Chakrabarti
Summary: This article presents a method for programmed self-assembly of single colloidal gyroid crystals using rationally designed patchy spheres. The single colloidal gyroid has a wide photonic bandgap and rich chiroptical properties, making it an attractive chiral photonic crystal.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
V. V. Vanyukov, M. Shuba, A. G. Nasibulin, Y. P. Svirko, P. P. Kuzhir, G. M. Mikheev
Summary: The nonlinear absorption and refraction of free-standing films made of single-walled carbon nanotubes (SWNTs) have been studied experimentally and theoretically, analyzing the effects of laser pulse duration and dynamic Burstein-Moss shift on saturation intensity. Experimental results showed high absorption modulation depth and red-shifted saturation intensity minimum due to dynamic Burstein-Moss shift. Measurements also revealed negative nonlinear refractive index at specific wavelengths.
Article
Nanoscience & Nanotechnology
Lena Golubewa, Tatsiana Kulahava, Aliona Klimovich, Danielis Rutkauskas, Ieva Matulaitiene, Renata Karpicz, Nikita Belko, Dmitri Mogilevtsev, Alena Kavalenka, Marina Fetisova, Petri Karvinen, Yuri Svirko, Polina Kuzhir
Summary: In this study, it is demonstrated that green fluorescence graphene quantum dots can detect the presence of hypochlorous acid and selectively detect reactive chlorine species produced by neutrophils. Changes in the fluorescence of GQDs under different conditions make them a promising sensing agent for biomedical applications.
Article
Nanoscience & Nanotechnology
Marian Baah, Afifa Rahman, Sarah Sibilia, Gianmarco Trezza, Luigi Ferrigno, Laura Micheli, Antonio Maffucci, Ekaterina Soboleva, Yuri Svirko, Polina Kuzhir
Summary: This paper proposes an original approach for real-time detection of industrial organic pollutants in water based on the time evolution monitoring of the electrical impedance of low-cost graphitic nanomembranes. The approach utilizes the high sensitivity of 2D graphene-related materials to adsorbents. The study examines the sensitivity of nanomembranes based on pyrolyzed photoresist, pyrolytic carbon (PyC), and multilayer graphene films, and demonstrates the correlation between the sensitivity of electric impedance to adsorbents and the structure of the nanomembranes. The results reveal that amorphous PyC, being the most homogeneous and adhesive to the SiO2 substrate, shows the most promising integration capability into industrial pollutants sensors.
Article
Physics, Applied
Yuyuan Huang, Kuniaki Konishi, Momoko Deura, Yusuke Shimoyama, Junji Yumoto, Makoto Kuwata-Gonokami, Yukihiro Shimogaki, Takeshi Momose
Summary: This study aimed to identify suitable metallic materials for constructing metal-coated dielectric terahertz (THz) waveguides. The researchers examined seven different metals and experimentally determined the propagation losses of their metal-coated waveguides. They developed a physical model to estimate key parameters influencing the performance of the waveguides and applied it to identify copper (Cu) as the optimal metal. The study also evaluated the impact of surface oxide layers on THz wave propagation and found that copper oxide had negligible effect.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Multidisciplinary Sciences
Yusuke Morita, Kosuke Yoshioka, Makoto Kuwata-Gonokami
Summary: A new type of Bose-Einstein condensate was observed in a trapped gas of 1s paraexcitons in bulk Cu2O below 400 mK, with a small condensate fraction of 0.016 and spatial profile described by mean-field theory. The condensate was undetectable by conventional luminescence spectroscopy, showing potential for understanding quantum statistical mechanics of non-equilibrium open systems.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
Masataka Kobayashi, Yusuke Arashida, Kanta Asakawa, Keisuke Kaneshima, Masashi Kuwahara, Kuniaki Konishi, Junji Yumoto, Makoto Kuwata-Gonokami, Jun Takeda, Ikufumi Katayama
Summary: Using high-repetition-rate single-shot spectroscopy and a laser microscope, we revealed the pulse-to-pulse ultrafast dynamics of energy relaxation in Ge2Sb2Te5 thin films. The study observed the transient transmittance change of the crystalline phase and the subsequent amorphous phase energy relaxation, leading to efficient energy relaxation and the formation of laser-induced periodic surface structures.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Yaraslau Padrez, Lena Golubewa, Anastasiya Bahdanava, Marija Jankunec, Ieva Matulaitiene, Dmitry Semenov, Renata Karpicz, Tatsiana Kulahava, Yuri Svirko, Polina Kuzhir
Summary: A systematic spectroscopic characterization of highly homogeneous water suspensions of 'buckydiamonds' revealed four types of specific structures on the ND surface that demonstrate excitation-wavelength-dependent photoluminescence (PL). The PL properties of NDs suspensions show concentration-dependent behavior, indicating a tendency for NDs to agglomerate. The pH sensitivity of the 'buckydiamonds' was explored, and it was found that they can serve as all-optical sensors for tiny pH variations in a wide range of pH values.
Article
Optics
Ryohei Yamada, Wataru Komatsubara, Haruyuki Sakurai, Kuniaki Konishi, Norikatsu Mio, Junji Yumoto, Makoto Kuwata-Gonokami
Summary: The utilization of sub-100 fs pulses is an attracting approach to improve femtosecond laser microfabrication. However, nonlinear propagation effects in air distort the beam's profile, making it difficult to predict the ablation crater shape. In this study, we developed a method using nonlinear propagation simulations to quantitatively predict the ablation crater shape. The method showed excellent agreement with experimental results for different pulse energies and revealed a correlation between simulated fluence and ablation depth.
Article
Physics, Applied
A. Ospanova, M. Cojocari, P. Lamberti, A. Plyushch, L. Matekovits, Yu. Svirko, P. Kuzhir, A. Basharin
Summary: According to the Babinet principle, the diffraction pattern from an opaque body is identical to that from a hole of the same shape and size. We propose a Babinet principle-based metamaterial made of two complementary metal/hole checkerboards, which demonstrates absolute transparency in a broad frequency range. The proven concept of simple, reproducible, and scalable design of the Babinet metamaterial paves the way for the fabrication of broadband transparent devices at any frequency, including THz and optical ranges.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Timofei Eremin, Valentina Eremina, Yuri Svirko, Petr Obraztsov
Summary: Covalent functionalization of single-walled carbon nanotubes (SWCNTs) can greatly enhance their photoluminescent (PL) brightness, making them suitable for infrared light emitters.
Article
Materials Science, Multidisciplinary
J. Omachi, N. Naka, K. Yoshioka, M. Kuwata-Gonokami
Summary: In this study, we investigated the dynamic properties of the electron-hole state in electron-hole droplets (EHDs) using dielectric response measurements. We found that the surface plasmon resonance of EHDs and the electron-hole Coulomb interaction had a significant impact on the dynamic dielectric response. The carrier density inside EHDs remained constant, while the decay time of the condensed volume was short and the AC conductivity relaxation rate was the highest among group-IV semiconductors during the nanosecond timescale.
Article
Optics
Yiping Chen, Munekazu Horikoshi, Makoto Kuwata-Gonokami, Kosuke Yoshioka
Summary: In this study, a balanced noninteracting Bose gas was created using a Bose-Fermi mixture, and the critical point of noninteraction was determined. The results of this study are crucial for further understanding the properties of an ideal Bose gas in a harmonic trap.
