Article
Nanoscience & Nanotechnology
Wladislaw Michailow, Nikita W. Almond, Harvey E. Beere, David A. Ritchie
Summary: This study demonstrates that cylindrical multimode waveguides can both deliver and simultaneously focus radiation without external lenses or mirrors. The focused spot achieved a more than 8.4x higher intensity than the cross-sectional average intensity and compressed the half-maximum spot area by a factor of >15. This is the first practical realization of a focusing system using a single cylindrical multimode waveguide, enabling design optimization and precise optical characterization of cylindrical structures and objects.
Article
Optics
A. O. Tang, G. U. A. N. G. Y. U. N. Xiong, F. E. N. G. Shen
Summary: In this Letter, a simple optical vortex convolution generator is proposed using a microlens array as an optical convolution device and a focusing lens to obtain the far field. The method can convert a single optical vortex into a vortex array. The optical field distribution on the focal plane is analyzed and verified experimentally. The generation of high-order vortex arrays is also investigated. This method has a simple structure, high optical power efficiency, and promising applications in optical tweezers, optical communication, and beam transmission.
Article
Optics
Subimal Deb, Dhrubajyoti Sadhukhan, Prasanta K. Panigrahi
Summary: We demonstrate the precise variation of self-imaging distance with the width of a Gaussian input and find that the self-imaging distance depends on the beam width and the number of excited modes in the waveguide. These findings are important for designing devices such as nanophotonic circuits that utilize self-imaging for improved efficiency.
Article
Optics
Mikkel F. Andersen, Sandro Wimberger
Summary: In this article, we propose a classical approximation for describing the survival resonances that occur when matter waves diffract from absorption potentials. Our simplified model accurately describes the absorption-diffraction process around the Talbot time. The classical model allows for the simple evolution of phase-space probability densities and provides a compact analytical expression of the survival probability as a function of remaining parameters when the effective Planck constant tends to zero.
Article
Physics, Multidisciplinary
Kang-Ping Ye, Wen-Jin Pei, Zhong-Hao Sa, Huanyang Chen, Rui-Xin Wu
Summary: The study experimentally demonstrated the effects of superscatterer and invisible gateway in stopping electromagnetic wave propagation in an air channel, providing a new platform for the design of future illusion devices.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Jiajia Zhao, You Wu, Zejia Lin, Danlin Xu, Haiqi Huang, Chuangjie Xu, Zhifeng Tu, Hongzhan Liu, Lingling Shui, Dongmei Deng
Summary: The Talbot-like effect of symmetric Pearcey beams is investigated in this study, both numerically and experimentally in free space. The results show that these beams exhibit periodic, multiple autofocusing and self-healing properties. The focusing positions and times are controlled by the beam shift factor and distribution factors. Additionally, the Talbot-like effect and period are influenced by the beam shift factor, indicating the potential for diverse applications of the Talbot effect.
Article
Nanoscience & Nanotechnology
Athanasios Bogris, Nikolaos A. Burger, Konstantinos G. Makris, Benoit Loppinet, George Fytas
Summary: This article describes the nonlinear effects of low-power visible light in soft matter systems and demonstrates how these effects can be captured using a nonlinear propagation model. The authors also propose the possibility of using the versatile response of solutions to light irradiation for self-written waveguides and pattern formation.
Article
Engineering, Electrical & Electronic
Rustem Shakhmuratov
Summary: This study investigates the generation of flat-top pulses with a duty ratio close to 50% in a periodical sawtooth phase-modulated CW laser field propagating through a group-delay-dispersion circuit. The proposed method is compared with a binary phase-modulated field and the technical advantages of sawtooth phase modulation are discussed.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Zhong-Mei Huang, Shi-Rong Liu, Hong-yan Peng, Xin Li, Wei-Qi Huang
Summary: The research discovered that in the laser reflecting Talbot magnification effect, using the appropriate wave-front shape of the injection beam can effectively enlarge the image and improve the resolution, while also observing periodic plasmonic structures on the silicon surface.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Analytical
Fateme Nazarzadeh, Abbas Ali Heidari
Summary: This paper presents a wideband flat lens antenna based on conformal transformation optics (CTO) with low reflection and good performance. Physical space optimization and optical path rescaling are applied to eliminate singular refractive index values and reduce reflection, resulting in an implementable all-dielectric isotropic medium. The designed flat lens operates in a wide frequency bandwidth, with an S-11 value of less than -15 dB in the frequency range of 13 to 30 GHz.
Article
Optics
Wen Xiao, Sicen Tao, Huanyang Chen
Summary: General relativity establishes the equivalence between matter-energy density and spacetime curvature, leading to the bending or trapping of light or matter near massive celestial objects. The use of gradient index lenses in optical systems allows for the simulation of complex celestial behaviors such as Schwarzschild precession and potential dark matter interactions, providing a valuable tool for exploring these phenomena.
PHOTONICS RESEARCH
(2021)
Article
Optics
Fateme Nazarzadeh, Abbas Ali Heidari
Summary: This study presents a high-performance wideband flat reflector designed using conformal transformation optics, with reduced device dispersion and wideband operation characteristics.
Article
Physics, Multidisciplinary
Joseph Mays, Greg Gbur
Summary: This study examines the appearance of superoscillations in the phase of the correlation function in partially coherent Talbot carpets. It demonstrates that despite a decrease in spatial coherence, superoscillations can propagate into the far field and that this decrease in spatial coherence can enhance the superoscillatory behavior at the primary and secondary Talbot images.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Physics, Multidisciplinary
Wei Lei, Jing-Jing Dai, Cong-Yang Wen, Meng-Ya Zong, Sheng-Nan Li, Zhi-Yang Wang
Summary: This paper proposes a ring laser array structure and studies the Talbot effect. By comparing with the one-dimensional laser array, the near-field distribution of the ring laser array without edge effect is obtained, which is beneficial for improving the external cavity phase locking capability of lasers. The Talbot effect and self imaging condition of the ring laser array in polar coordinates are calculated, and the sub-image distribution at the fractional Talbot distance is further analyzed.
ACTA PHYSICA SINICA
(2023)
Article
Optics
Junjie He, Runkai Chen, Yifan Li, Songpei Chen, Zhongmin Liu, Qingmao Zhang
Summary: The proposed metalens based on an ellipse-shaped perforated graphene metasurface demonstrates high-efficiency tunability, broad bandwidth, and outstanding focusing efficiency. By optimizing the axial length ratio and orientation of the elliptical aperture, it achieves high reflectivity and continuous phase shift, making it suitable for dynamic imaging and stable focusing applications.
Article
Multidisciplinary Sciences
Pengfei Zhao, Guoxiong Cai, Huanyang Chen
Summary: We present a novel method for designing transformation optical devices based on electrostatics. The method utilizes the transformation of electrostatic field to achieve a new refractive index distribution, where wave-fronts and energy flux lines correspond to equipotential surfaces and electrostatic flux lines, respectively. The method can be used to design multipole lenses and explain the illusion effects of some multipole lenses.
Article
Astronomy & Astrophysics
Guoying Zhao, Zhaosheng Li, Yuanyue Pan, Maurizio Falanga, Long Ji, Yupeng Chen, Shu Zhang
Summary: Type I X-ray bursts are the result of unstable thermonuclear burning on the surface of a neutron star, resulting in the release of energetic X-ray photons. These bursts interact with the surrounding accretion disk, increasing the accretion rate. By analyzing two photospheric radius expansion bursts in 4U 1636-536, it was found that the spectral fitting can be improved by considering enhanced persistent emission or reflection from the accretion disk. Evidence suggests that both Poynting-Robertson drag and disk reflection occurred during these bursts, and the disk reflection may contribute up to 20-30% of the total burst emissions.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Optics
Jue Li, Yangyang Zhou, Huanyang Chen
Summary: In this study, a solid immersion square Maxwell's fish-eye lens is proposed to achieve broadband achromatic super-resolution imaging based on transformation optics at microwave frequencies. A super-resolution information transmission channel is also designed for long-distance multi-source super-resolution information transmission.
CHINESE OPTICS LETTERS
(2022)
Article
Optics
Shuwen Xue, Chuanjie Hu, Miao Zhang, Huanyang Chen
Summary: Cats' fascinating eyes with various colors and strong night vision ability have been studied to reveal the secrets behind them. Researchers have found that cats' eyes can be considered as special lenses with photonic crystals playing a key role. Integrating photonic crystals into a Luneburg lens greatly improves the light focusing intensity, offering inspiration for designing more interesting and practical devices.
CHINESE OPTICS LETTERS
(2022)
Article
Astronomy & Astrophysics
Xiaobo Li, Mingyu Ge, Lin Lin, Shuang-Nan Zhang, Liming Song, Xuelei Cao, Bing Zhang, Fangjun Lu, Yupeng Xu, Shaolin Xiong, Youli Tuo, Ying Tan, Weichun Jiang, Jinlu Qu, Shu Zhang, Lingjun Wang, Jieshuang Wang, Binbin Zhang, Peng Zhang, Chengkui Li, Congzhan Liu, Tipei Li, Qingcui Bu, Ce Cai, Yong Chen, Yupeng Chen, Zhi Chang, Li Chen, Tianxiang Chen, Yibao Chen, Weiwei Cui, Yuanyuan Du, Guanhua Gao, He Gao, Yudong Gu, Ju Guan, Chengcheng Guo, Dawei Han, Yue Huang, Jia Huo, Shumei Jia, Jing Jin, Lingda Kong, Bing Li, Gang Li, Wei Li, Xian Li, Xufang Li, Zhengwei Li, Xiaohua Liang, Jinyuan Liao, Hexin Liu, Hongwei Liu, Xiaojing Liu, Xuefeng Lu, Qi Luo, Tao Luo, Binyuan Ma, Ruican Ma, Xiang Ma, Bin Meng, Yi Nang, Jianyin Nie, Ge Ou, Xiaoqin Ren, Na Sai, Xinying Song, Liang Sun, Lian Tao, Chen Wang, Pengju Wang, Wenshuai Wang, Yusa Wang, Xiangyang Wen, Bobing Wu, Baiyang Wu, Mei Wu, Shuo Xiao, Sheng Yang, Yanji Yang, Qibin Yi, Qianqing Yin, Yuan You, Wei Yu, Fan Zhang, Hongmei Zhang, Juan Zhang, Wanchang Zhang, Wei Zhang, Yifei Zhang, Yuanhang Zhang, Haisheng Zhao, Xiaofan Zhao, Shijie Zheng, Dengke Zhou
Summary: This study reports the detection of a strong quasi-periodic oscillation (QPO) of about 40 Hz in an X-ray burst from the magnetar SGR J1935+2154, which is associated with FRB 200428. The discovery suggests that some FRBs may be related to strong oscillation processes of neutron stars, providing important clues for understanding the origin and mechanism of FRBs.
ASTROPHYSICAL JOURNAL
(2022)
Article
Physics, Multidisciplinary
Linkang Han, Shiming Chen, Huanyang Chen
Summary: We discovered that a one-dimensional groove array can mimic negative water depth and generate unidirectional surface polaritons for water waves. Through theoretical analysis, numerical simulations, and experiments, we explained this phenomenon, demonstrating that the propagation direction of water waves can be controlled using such simple structures. This has significant implications for offshore transportation and environmental protection.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Weicong He, Shan Zhu, Chuanjie Hu, Zhanlei Hao, Yineng Liu, Huanyang Chen
Summary: In this paper, a new strategy for designing phase gradient metasurfaces (PGMs) is proposed, which achieves efficient control of electromagnetic wavefronts by changing the shape of the boundary. The reflection-type PGMs designed using this strategy, including a reflection focusing lens, a quasi airy beam generator, and PGMs, demonstrate excellent performance in wavefront control. The proposed method is also applicable to the design of transmission-type metasurfaces and other wavefront transformations, providing a novel approach for wave manipulation.
Article
Physics, Applied
Yangyang Zhou, Zhanlei Hao, Pengfei Zhao, Huanyang Chen
Summary: This work introduces a new approach to achieve super-resolution imaging without the need for drain assistance in Maxwell's fish-eye lens. By embedding the lens in an exterior coating inspired by the solid immersion concept, the solution addresses the criticisms and debates surrounding the physics of super-resolution phenomena in MFEL. The total reflection at the outer solid-immersion interface and the native perfect focusing of MFEL contribute to the formation of a super-resolution image in the air.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Yangyang Zhou, Jue Li, Wen Xiao, Huanyang Chen
Summary: This study introduces a generalized conformal Luneburg lens (GCLL) based on conformal transformation optics for achieving broadband achromatic and highly efficient quasi-far-field super-focusing. The lens has a relatively high numerical aperture and sub-diffraction-limited resolution, and it is designed using gradient metamaterials.
Article
Optics
Chong Sheng, Yao Wang, Yijun Chang, Huiming Wang, Yongheng Lu, Yingyue Yang, Shining Zhu, Xianmin Jin, Hui Liu
Summary: Topology has been widely used in various branches of physics, and topological defects in cosmology can be simulated to achieve bound vortex light on optical chips.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Lei Zhao, Bei Wu, Yao Niu, Shengke Zhu, Ye Chen, Huanyang Chen, Jin-hui Chen
Summary: With the rapid development of deep learning and computing power, human-computer interactions and interfaces have become topics of interest in industrial and academic research. Hand gesture recognition, as a new way of studying human-computer interactions, poses challenges due to the complexity and flexibility of the human hand. This research presents a robust and cost-effective gesture recognition system using soft optoelectronic sensors and a deep learning network, achieving high recognition accuracy for hand gestures.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Physics, Applied
Chuanjie Hu, Yuhang Yin, Huanyang Chen
Summary: This study demonstrates the feasibility of achieving three-dimensional omnidirectional passive acoustic illusion using Fabry-Perot resonances. The research has the potential for application in modern acoustic illusion devices, such as camouflage for antisonar detection.
PHYSICAL REVIEW APPLIED
(2022)
Article
Astronomy & Astrophysics
Wen Xiao, Pengfei Zhao, Yixiao Ge, Sicen Tao, Yali Zeng, Lin Xu, Huanyang Chen
Summary: de Sitter space is an important solution of Einstein's field equation that explains the accelerated expansion of the Universe. In this study, we propose a de Sitter space model based on the equivalence between static curved space-time and isotropic optical medium. We discover a topological cosmic string kernel in the center of the generalized de Sitter space, which can deflect light in different ways. By implementing a multiple source illusion effect, we find that the energy flow obeys the topological Poincare-Hopf theorem.
Article
Optics
Tao Hou, Huanyang Chen
Summary: This paper demonstrates the analogy between the anisotropic Kepler problem and the non-rotationally-symmetric Eaton lens through numerical calculations and simulations. When the mass ratio is greater than 1, the non-rotationally-symmetric Eaton lens can simulate and reproduce the periodic orbits and chaotic characteristics of the anisotropic Kepler problem in geometric and wave optics. Additionally, the study reveals that the deflected beam in non-rotationally-symmetric Eaton lens can have scatterings in various directions, which are influenced by the incident direction and mass ratio.
Article
Nanoscience & Nanotechnology
Tao Hou, Sicen Tao, Haoran Mu, Qiaoliang Bao, Huanyang Chen
Summary: By combining transformation optics and van der Waals layered materials, a proposed invisibility concentrator utilizes a thin layer of alpha-MoO3 to wrap around a cylinder, inheriting invisibility and energy concentration effects. Analytical calculation and numerical simulations confirm the device's functionalities, providing guidelines for future experimental verification.
