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Optical bound states in the continuum in periodic structures:mechanisms,effects,and applications

Photonics Insights 2024年第1期3卷 1-26页

作者： Jiajun Wang Peishen Li Xingqi Zhao Zhiyuan Qian Xinhao Wang Feifan Wang Xinyi Zhou Dezhuan Han Chao Peng Lei Shi Jian Zi State Key Laboratory of Surface Physics Key Laboratory of Micro-and Nano-Photonic Structures(Ministry of Education)and Department of PhysicsFudan UniversityShanghaiChina State Key Laboratory of Advanced Optical Communication Systems and Networks School of ElectronicsPeking UniversityBeijingChina College of Physics Chongqing UniversityChongqingChina Institute for Nanoelectronic devices and Quantum computing Fudan UniversityShanghaiChina Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjingChina Shanghai Research Center for Quantum Sciences ShanghaiChina

Optical bound states in the continuum(BICs)have recently stimulated a research boom,accompanied by demonstrations of abundant exotic phenomena and *** ultrahigh quality(Q)factors,optical BICs have powerful abilities to trap light in optical structures from the continuum of propagation waves in free *** the high Q factors enabled by the confined properties,many hidden topological characteristics were discovered in optical *** in periodic structures with well-defined wave vectors,optical BICs were discovered to carry topological charges in momentum space,underlying many unique physical *** high Q factors and topological vortex configurations in momentum space enabled by BICs bring new degrees of freedom to modulate *** have enabled many novel discoveries in light-matter interactions and spin-orbit interactions of light,and BIC applications in lasing and sensing have also been well explored with many *** this paper,we review recent developments of optical BICs in periodic structures,including the physical mechanisms of BICs,explored effects enabled by BICs,and applications of *** the outlook part,we provide a perspective on future developments for BICs.

关键词： bound state in the continuum light trapping topological charge polarization vortex momentum space light field manipulation photonic crystal slab nanophotonics

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Propagations of Fresnel diffraction accelerating beam in Schrodinger equation with nonlocal nonlinearity

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Chinese Physics B 2021年第11期30卷 375-380页

作者： Yagang Zhang Yuheng Pei Yibo Yuan Feng Wen Yuzong Gu Zhenkun Wu Institute of Nano/Photon Materials and Application&International Joint Research Laboratory of New Energy Materials and Devices of Henan Province School of Physics and ElectronicsHenan UniversityKaifeng 475004China College of Miami Henan UniversityKaifeng 475004China Key Laboratory for Physical Electronics and Devices of the Ministry of Education&School of Science&Shaanxi Key Laboratory of Information Photonic Technique&Institute of Wide Bandgap Semiconductors Xi’an Jiaotong UniversityXi’an 710049China

Accelerating beams have been the subject of extensive research in the last few decades because of their selfacceleration and diffraction-free propagation over several Rayleigh ***,we investigate the propagation dynamics of a Fresnel diffraction beam using the nonlocal nonlinear Schrodinger equation(NNLSE).When a nonlocal nonlinearity is introduced into the linear Schrodinger equation without invoking an external potential,the evolution behaviors of incident Fresnel diffraction beams are modulated regularly,and certain novel phenomena are *** show through numerical calculations,under varying degrees of nonlocality,that nonlocality significantly affects the evolution of Fresnel diffraction ***,we briefly discuss the two-dimensional case as the equivalent of the product of two one-dimensional *** a critical point,the Airy-like intensity profile oscillates between the first and third quadrants,and the process repeats during propagation to yield an unusual *** results are expected to contribute to the understanding of NNLSE and nonlinear optics.

关键词： Fresnel diffraction beams nonlocal nonlinearity real space momentum space three-dimensional(3D)Schrodinger equation

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Enhanced Correlation of Electron-Positron Pair in Two and Three Dimensions

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Chinese Physics Letters 2014年第1期31卷 48-51页

作者：唐琐谢柏松王虹宇刘杰傅立斌郁明阳 Key Laboratory of Beam Technology and Materials Modification of the Ministry of Education College of Nuclear Science and Technology Beijing Normal University Beijing 100875 Department of Physics Anshan Normal University Anshan 114005 Institute of Applied Physics and Computational Mathematics P. O. Box 8009 Beijing 100088 Institute for Fusion Theory and Simulation Department of Physics Zhejiang University Hangzhou 310027 Institut fur Theoretische Physik I Ruhr-Universigt Bochum D-44780 Bochum Germany

Early time electron-positron correlation in vacuum pair-production in an external field is investigated. The entangled electron and positron wave functions are obtained analytically in the configuration and momentum spaces. It is shown that, relative to that of the one-dimensional theory, two- and three-dimensional calculations yield enhanced spatial correlation and broadened momentum spectra. In fact, at early times the electron and positron almost coincide spatially. The correlation also depends on the direction of the applied field. For the spatial correlation, the transverse correlation is stronger than the longitudinal correlation.

关键词： ELECTRON-positron interactions POSITRONS WAVE functions momentum space SHEAR waves

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Solution to the Dirac equation using the finite difference method

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Nuclear Science and Techniques 2020年第2期31卷 20-27页

作者： Ji-Yu Fang Shou-Wan Chen Tai-Hua Heng School of Physics and Materials Science Anhui University

In this study,single-particle energy was examined using the finite difference method by taking 208Pb as an *** the first derivative term in the spherical Dirac equation is discretized using a three-point formula,a one-to-one correspondence occurs between the physical and spurious *** these energies are exactly the same,the wave functions of the spurious states exhibit a much faster staggering than those of the physical *** spurious states can be eliminated when applying the finite difference method by introducing an extra Wilson term into the ***,it was also found that the number of spurious states can be reduced if we improve the accuracy of the numerical differential *** Dirac equation is then solved in a momentum space in which there is no differential operator,and we found that the spurious states can be completely avoided in the momentum space,even without an extra Wilson term.

关键词： Finite difference method Spurious states momentum space

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