Article
Optics
Robert Shreiner, Kai Hao, Amy Butcher, Alexander A. High
Summary: Researchers demonstrated electrically controllable chirality by exploiting doping-dependent valley polarization of excitonic states in monolayer tungsten diselenide. They reported electrically controllable chirality in a nanophotonic interface, enabling propagation direction-dependent interactions between guided optical modes and circularly dichroic materials. This work could provide optical control over excitonic and charge-carrier behavior in integrated photonics with van der Waals heterostructures.
Article
Optics
Min-Soo Hwang, Ha-Reem Kim, Jungkil Kim, Bohm-Jung Yang, Yuri Kivshar, Hong-Gyu Park
Summary: This study demonstrates wavelength-scale, low-threshold, vortex and anti-vortex nanolasers with topological charges in an optical cavity formed by a topological disclination. The optical vortices of the lasing modes are clearly identified through the measurement results. This simple design procedure paves the way towards the development of next-generation optical communication systems.
Article
Multidisciplinary Sciences
Biao Yang, Yangang Bi, Rui-Xing Zhang, Ruo-Yang Zhang, Oubo You, Zhihong Zhu, Jing Feng, Hongbo Sun, C. T. Chan, Chao-Xing Liu, Shuang Zhang
Summary: Berry curvature, the counterpart of the magnetic field in momentum space, plays a crucial role in electron transport and topological physics. Researchers have successfully demonstrated a toroidal moment of Berry curvature in metamaterials, which has significant implications for future studies.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
I Babushkin, A. Demircan, M. Kues, U. Morgner
Summary: This study shows that with coherent photon conversion, flying-qubit gates can be constructed that are insensitive to wave shapes and temporal and spectral correlations between photons. These gates are important for scalable computation as they allow for the processing of both unentangled and entangled photonic wave packets effectively.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Tomas Fordey, Petr Bouchal, Petr Schovanek, Michal Baranek, Zdenek Bouchal, Petr Dvorak, Martin Hrton, Katarina Rovenska, Filip Ligmajer, Radim Chmelik, Tomas Sikola
Summary: The study presents a technique for imaging the 3D rotational movement of metal nanorods, revealing different orientations of the nanorods in azimuthal and polar angles. By manipulating light angular momentum and generating optical vortices, the researchers were able to create self-interference images to determine the nanorods' angles via digital processing. The successful application of this technique in real-time imaging of nanorods in live-cell imaging highlights its potential for studying nanoscale systems.
Article
Materials Science, Multidisciplinary
Md Shah Alam, Rudra Gnawali, Joshua R. Hendrickson, Diane Beamer, Tamara E. Payne, Andrew Volk, Imad Agha
Summary: This article presents a realistic design of a Si-integrated photonic device for the generation of rapidly tunable OAM waves at a 1550-nm wavelength. By utilizing an ultra-low-loss phase change material embedded in a Si-ring resonator with angular gratings, different OAM modes can be achieved by rapidly switching the effective refractive index. The proposed device is capable of producing rapidly tunable OV beams carrying different OAM modes using electrically controllable ultra-low-loss PCM Sb2Se3.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Physics, Applied
Exian Liu, Bei Yan, Jianlan Xie, Yuchen Peng, Feng Gao, Jianjun Liu
Summary: This study proposes a circular dual-core photonic crystal fiber for dispersion compensation of controllable orbital angular momentum modes through inner-outer core mode coupling. The design simultaneously achieves negative dispersion and high effective index separation, ensuring robust propagation of vortex modes. Structural parameter tuning allows for achieving negative dispersion in different modes.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Review
Physics, Applied
Xinyu Wang, Shuguang Li, Tonglei Cheng, Jianshe Li
Summary: Photonic crystal fibers (PCFs) with peculiar air-hole arrangement have shown great potential in achieving extraordinary transmission properties through integration with functional materials. This review discusses the development stages of photonic devices based on functional material-infiltrated PCFs, covering the overview of common materials, infiltration/coating techniques, and applications in optical communication and sensing elements.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Optics
Liang Fang, Shuang Zheng, Jian Wang
Summary: The article proposes a new design of on-chip Stokes polarimetric scheme based on polarization-dependent silicon photonic circuits, which can simultaneously measure different polarization components of incident light to achieve full measurement of incident polarization states. This new design is expected to enrich the family of micro-nano polarimetric devices and pave the way for polarization-based integrated optoelectronics, nanophotonics, and metrology.
Article
Engineering, Electrical & Electronic
Eric Numkam Fokoua, Wenwu Zhu, Meng Ding, Zitong Feng, Yong Chen, Thomas D. Bradley, Gregory T. Jasion, David J. Richardson, Francesco Poletti, Radan Slavik
Summary: Hollow-core optical fibers convey light in air, showing remarkably low sensitivity of the propagation delay to temperature changes, especially in photonic bandgap type. The residual variation in propagation delay observed near the zero sensitivity wavelength has no apparent correlation to imposed temperature changes. Practical thermal stability of latency is limited by polarization mode dispersion, with strong polarization mode coupling observed in addition to birefringence.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Min Lin, Luping Du, Xiaocong Yuan
Summary: Magnetic Skyrmions are topologically protected spin structures with complicated swirls of electron spins. Recently, photonic counterparts of the magnetic Skyrmions have been discovered with new deep-subwavelength characteristics that have potential applications in optical information storage and transfer. In this study, different forms of pseudospin Skyrmion around the Dirac point in momentum space of photonic crystals with the Kagome and honeycomb lattice were observed. The manipulation of pseudospin Skyrmions in momentum space can be valuable for controlling the flows and polarizations of light in topologically robust ways.
IEEE PHOTONICS JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Limin Song, Domenico Bongiovanni, Zhichan Hu, Ziteng Wang, Shiqi Xia, Liqin Tang, Daohong Song, Roberto Morandotti, Zhigang Chen
Summary: This study reveals the existence of two distinct classes of topological corner states in breathing photonic Kagome lattices with bearded edge truncation, which are verified through experiments and numerical simulations.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Richa Sharma, Shuvendu Jena, Dinesh Udupa
Summary: In this study, the coupling of topological interface states in a one-dimensional photonic crystal was systematically investigated across a broad energy range of the electromagnetic spectrum. It was found that robust topological interface states appear when the Zak phase between adjacent photonic crystals differs at their common photonic bandgap. The coupled interface states, created by combining three photonic crystals, are useful for spatial confinement and enhancement of electric fields, with potential applications in nonlinear photonics and multichannel filters.
Article
Engineering, Electrical & Electronic
Qichang Ma, Aiping Luo, Weiyi Hong
Summary: A photonic crystal fiber with a high refractive index ring capable of supporting a high number of OAM modes has been proposed, with numerical analysis conducted using the finite element method. The design effectively suppresses high order radial modes, ensuring stable transmission of OAM modes with excellent performance.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Ouri Karni, Elyse Barre, Vivek Pareek, Johnathan D. Georgaras, Michael K. L. Man, Chakradhar Sahoo, David R. Bacon, Xing Zhu, Henrique B. Ribeiro, Aidan L. O'Beirne, Jenny Hu, Abdullah Al-Mahboob, Mohamed M. M. Abdelrasoul, Nicholas S. Chan, Arka Karmakar, Andrew J. Winchester, Bumho Kim, Kenji Watanabe, Takashi Taniguchi, Katayun Barmak, Julien Madeo, Felipe H. da Jornada, Tony F. Heinz, Keshav M. Dani
Summary: Interlayer excitons, electron-hole pairs bound across atomically thin layered semiconductors, have attracted attention for quantum information applications. In this study, images of the time-resolved and momentum-resolved distribution of both particles were captured in a WSe2/MoS2 heterostructure, providing direct measurements of the interlayer exciton diameter and its localization. The results show that interlayer excitons can be highly localized within small moire unit cells.
Article
Materials Science, Multidisciplinary
Jiao Chu, Yan Chen, Shi-Ying Tan, Yuan-Yuan Liu, Wenzhe Liu, Xiaohan Liu, Lei Shi, Haifang Wang, Wei Li, Jian Zi
Summary: With concerns over the safety of synthetic food colorants, a strategy of mixing two edible sub-microspheres is reported to produce mass amorphous photonic structures with structural color, which are proven to be safe and promising for applications in food, drugs, and cosmetics.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Optics
Zhengyu Yan, Jiajun Wang, Caoyuan Wang, Ruowei Yu, Lei Shi, Limin Xiao
Summary: In this study, we proposed and fabricated hybrid microfiber waveguides with self-growing polymer nanofilms on the surface. The results demonstrated that the fabricated hybrid microfibers exhibited excellent transmission performance and response, indicating their potential for humidity sensing.
Review
Physics, Multidisciplinary
Wen-Zhe Liu, Lei Shi, Che-Ting Chan, Jian Zi
Summary: This review summarizes the recent research progress on momentum-space polarization fields and singularities in two-dimensional photonic-crystal slabs, focusing on their unique optical properties and potential applications.
Article
Multidisciplinary Sciences
Tongyu Li, Jiajun Wang, Wenjie Zhang, Xinhao Wang, Wenzhe Liu, Lei Shi, Jian Zi
Summary: A guideline for designing high-efficiency nonlocal reflection-type vortex generators based on temporal-coupled-mode theory is proposed. The conversion efficiency of vortex beams is limited by the ratio of radiative loss to intrinsic absorption in practical systems.
NATIONAL SCIENCE REVIEW
(2023)
Article
Chemistry, Multidisciplinary
Fan Yang, Qianyun Chen, Jiajun Wang, Julia J. Chang, Wenhao Dong, Wei Cao, Shunsheng Ye, Lei Shi, Zhihong Nie
Summary: This article describes a general approach for the efficient fabrication of centimeter-scale inorganic nanoparticle arrays with precise control over size, composition, position, and lattice geometry. The method combines solvent-assisted soft lithography and in situ site-specific nanoparticle growth to reproducibly create multiple replicates of nanoparticle arrays without the need for cleanroom and specialized equipment. As a demonstration, ultranarrow surface lattice resonances with a line width of 4 nm and a quality factor of 218 (approaching the theoretical limit) are achieved in Au nanoparticle arrays.
Article
Physics, Multidisciplinary
Yang Tang, Jiajun Wang, Xingqi Zhao, Tongyu Li, Lei Shi
Summary: Periodic photonic structures can modulate the propagation of light due to well-defined band structures, but the finite size of practically fabricated structures leads to changes in light propagation modulation compared to infinite structures. The size effect on light localization and near-zero refractive-index propagation near band edges in one-dimensional periodic structures is studied.
Article
Physics, Multidisciplinary
Mamoon Safadi, Ohad Lib, Ho-Chun Lin, Chia Wei Hsu, Arthur Goetschy, Yaron Bromberg
Summary: In this study, it is discovered that multiply scattered entangled photons reflected from a dynamic complex medium remain partially correlated. Enhanced correlations are observed in experiments and full-wave simulations, which arise from the interference between scattering trajectories. This work points to opportunities for entanglement transport despite dynamic multiple scattering in complex systems.
Article
Physics, Multidisciplinary
Jiajun Wang, Lei Shi, Jian Zi
Summary: We theoretically propose and experimentally demonstrate the spin Hall effect of light in photonic crystal slabs using momentum-space topological vortices around BICs. Our findings reveal spin-related topological effects around BICs, opening up possibilities for the application of BICs in integrated spin-optical devices and information processing.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Shiyu Li, Chia Wei Hsu
Summary: The rapidly advancing capabilities in nanophotonic design are enabling complex functionalities within the limits of physics. However, the ultimate limit of transmission efficiency remains unknown for most systems. This study introduces a matrix formalism that establishes a fundamental bound on the channel-averaged transmission efficiency of any passive multi-channel optical system, based on energy conservation and the desired functionality. The study reveals that the commonly adopted designs for nonlocal metalenses with equal entrance and output aperture diameters lead to a decrease in transmission efficiency with numerical aperture, and suggests that reducing the entrance aperture size can increase the efficiency bound. This research provides valuable insights into the fundamental limits and design considerations for high-efficiency multi-channel optical systems.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Shihao Du, Zhiyuan Che, Maoxiong Zhao, Wenzhe Liu, Lei Shi
Summary: This Letter demonstrates the realization of large transmitted Goos-Hanchen shifts with high transmittance based on a coupled double-layer grating system. By changing the distance and the relative dislocation between the two dielectric gratings, the coupling of the double-layer grating can be flexibly tuned. The Goos-Hanchen shift of the double-layer grating reaches similar to 30 times the wavelength, approaching 1.3 times the radius of the beam waist, which can be observed directly.
Article
Materials Science, Multidisciplinary
Alok Ghanekar, Bo K. Shrewsbury, Chia Wei Hsu, Rehan Kapadia, Michelle L. Povinelli
Summary: We propose an electro-optic pathway to break symmetry and enable dynamic light-matter interaction in guided-mode resonance grating. By breaking mirror symmetry, we can access bound states in the continuum (BIC) that are otherwise inaccessible. Through careful design of a tunable GaAs-based grating, we achieve infrared absorption peaks in the longwave IR. The concept presents a novel route towards tunable directional absorption and emission.
MATERIALS TODAY PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Shihao Du, Wenjie Zhang, Wenzhe Liu, Yanbin Zhang, Maoxiong Zhao, Lei Shi
Summary: In this letter, the large transmitted optical positive and negative Goos-Hanchen shifts in photonic crystal slabs are demonstrated both numerically and experimentally. The observed Goos-Hanchen shift reaches up to 20 μm, 30 times the wavelength, which is close to the beam waist radius. By measuring the transmission phase, an acute phase change near the resonance in photonic crystal slabs is discovered, which enhances the Goos-Hanchen shift. The experimental results are consistent with simulations, and this work can be utilized for further research on light propagation modulation.
Article
Materials Science, Multidisciplinary
Yanbin Zhang, Zhiyuan Che, Wenzhe Liu, Jiajun Wang, Maoxiong Zhao, Fang Guan, Xiaohan Liu, Lei Shi, Jian Zi
Summary: This article applies the band-unfolding approach to investigate the dispersions of different types of photonic quasiperiodic structures, including highly-rotational symmetric photonic quasicrystals lacking translational symmetry, and moire superlattices formed by twisting two primary lattices. The band-unfolding approach offers a simple visualization of the band structure of these quasiperiodic structures, which can be directly compared with experimental results. This approach is envisioned to be a fundamental method for introducing the rich concepts of photonics in condensed-matter physics to photonic quasiperiodic systems.
