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Optical coherence structure:A novel tool for light manipulation

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Science China(Technological Sciences) 2022年第3期65卷 740-742页

作者： CHEN YaHong cai yangjian Institute of Optics School of Physical Science and TechnologySoochow UniversitySuzhou 215006China Shandong Provincial Engineering and Technical Center of Light Manipulation&Shandong Provincial Key Laboratory of Optics and Photonic Devices School of Physics and ElectronicsShandong Normal UniversityJinan 250014China

Light field manipulation refers to controlling light characteristics in spatial,temporal,frequency,or spatiotemporal *** created structured light fields have enabled progress in a broad range of interdisciplinary science and technology[1,2],owing to their novel physical *** traditional light manipulation is mainly focused on the government of deterministic features(sometimes called single-point characteristics)of fully coherent light.

关键词： properties. domains. light

Partially coherent vortex beams:Fundamentals and applications

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Science China(Physics,Mechanics & Astronomy) 2021年第2期64卷 32-50页

作者： Miao Dong ChengLiang Zhao yangjian cai YuanJie Yang School of Physics University of Electronic Science and Technology of ChinaChengdu611731China School of Physical Science and Technology Soochow UniversitySuzhou215006China Shandong Provincial Engineering and Technical Centre of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan250014China

It has been over 30 years since the concept of optical vortices was first proposed by Coullet et *** 1989,and the field of structured beams has grown *** the last two decades,partially coherent vortex beams(PCVBs)have received increasing interest in the fields of optical manipulation,optical communication,optical imaging,etc.,and great progress has been made in the area of the coherence singularities,generation methods,topological charge measurements,and promising applications of *** this review,we firstly outline the basic concepts of *** explicate the relationship between the coherence vortices and optical vortices,and the evolution behavior of optical vortices to coherence vortices is summarized in *** discuss a special form of coherence singularity,ring dislocation,mathematically and *** ring dislocation in the correlation functions under low coherence is dependent on the mode indices,which provide a feasible approach to measure mode indices of ***,we summarize the various methods for measuring the topological charge of PCVBs,highlight the measurement method based on the cross-correlation function,and a physical explanation on the relation between ring dislocation and topological charge is *** that,we review the recent advances on experimental generation of several kinds of ***,we give an overview on the potential applications of PCVBs.

关键词： coherence singularities coherence vortices vortex beams topological charge

Hollow vortex Gaussian beams

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Science China(Physics,Mechanics & Astronomy) 2013年第5期56卷 896-903页

作者： ZHOU GuoQuan cai yangjian DAI ChaoQing School of Sciences Zhejiang A & F University School of Physical Science and Technology Soochow University

A kind of hollow vortex Gaussian beam is introduced. Based on the Collins integral, an analytical propagation formula of a hollow vortex Gaussian beam through a paraxial ABCD optical system is derived. Due to the special distribution of the optical field, which is caused by the initial vortex phase, the dark region of a hollow vortex Gaussian beam will not disappear upon propagation. The analytical expressions for the beam propagation factor, the kurtosis parameter, and the orbital angular mo- mentum density of a hollow vortex Gaussian beam passing through a paraxial ABCD optical system are also derived, respec- tively. The beam propagation factor is determined by the beam order and the topological charge. The kurtosis parameter and the orbital angular momentum density depend on beam order n, topological charge m, parameter y, and transfer matrix ele- ments A and D. As a numerical example, the propagation properties of a hollow vortex Gaussian beam in free space are demonstrated. The hollow vortex Gaussian beam has eminent propagation stability and has crucial application prospects in op- tical micromanipulation.

关键词： hollow vortex Gaussian beam beam propagation factor kurtosis parameter orbital angular momentum density

Efficient high harmonic generation in nonlinear photonic moiré superlattice

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Frontiers of physics 2023年第5期18卷 209-216页

作者： Tingyin Ning Yingying Ren Yanyan Huo yangjian cai Shandong Provincial Engineering and Technical Center of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250358China Collaborative Innovation Center of Light Manipulation and Applications Shandong Normal UniversityJinan 250358China

Photonic moirésuperlattice as an emerging platform of flatbands can tightly confine the light inside the cavity and has important applications not only in linear optics but also in nonlinear *** this paper,we numerically investigate the third-and fifth-order harmonic generation(THG and FHG)in photonic moirésuperlattices fabricated by the nonlinear material *** high conversion efficiency of THG and FHG is obtained at a relatively low intensity of fundamental light,e.g.,the maximum conversion efficiency of THG and FHG arrives even up to be 10^(−2) and 10^(−9) at the fundamental intensity of 30 kW/m^(2),respectively,in the moirésuperlattice of near flat band formed by the twist angle 6.01°.The results indicate the photonic moirésuperlattice of a high-quality factor and flatbands is a promising platform for efficient nonlinear processes and advanced photonic devices.

关键词： moirésuperlattice resonant mode harmonic generation

Review on partially coherent vortex beams

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Frontiers of Optoelectronics 2019年第3期12卷 229-248页

作者： Jun ZENG Rong LIN Xianlong LIU Chengliang ZHAO yangjian cai School of Physical Science and Technology Soochow UniversitySuzhou 215006China Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250014China College of Physics and Electronic Engineering Heze UniversityHeze 274015China

Ever since vortex beams were proposed, they are known for owning phase singularity and carrying orbital angular momentum (OAM). In the past decades, coherent optics developed rapidly. Vortex beams have been extended from fully coherent light to partially coherent light, from scalar light to vector light, from integral topological charge (TC) to fractional TC. Partially coherent vortex beams have attracted tremendous interest due to their hidden correlation singularity and unique propagation properties (e.g., beam shaping, beam rotation and self-reconstruction). Based on the sufficient condition for devising a genuine correlation function of partially coherent beam, partially coherent vortex beams with nonconventional correlation functions (i.e., non-Gaussian correlated Schell-model functions) were introduced recently. This timely review summarizes basic concepts, theoretical models, generation and propagation of partially coherent vortex beams.

关键词： partially coherent vortex beam phase singularity correlation singularity topological charge (TC) coherence length correlation function

Edge enhancement of phase objects through complex media by using transmission-matrixbased spiral phase contrast imaging

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Frontiers of physics 2022年第5期17卷 191-196页

作者： Qian Zhao Shijie Tu Qiannan Lei Qingyang Yue Chengshan Guo yangjian cai Shandong Provincial Engineering and Technical Center of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250358China School of Physical Science and Technology Soochow UniversitySuzhou 215006China

The wavefront shaping based technique has been introduced to detect the edges of amplitude objects through complex media,but the extraction of the boundary information of invisible phase objects through complex media has not been demonstrated ***,we present a phase contrast imaging technique to overcome the scattering,aiming to achieve the edge detection of the phase object through the complex *** operator based on the experimentally measured transmission matrix is obtained by numerically adding a spiral phase in the Fourier *** the inverse of the filtered transmission matrix,we can directly reconstruct the edge enhanced images for both amplitude object and phase object beyond ***,both digital and real objects are imaged,and the results verify that isotropic edge detection can be achieved with our *** work could benefit the detection of invisible phase objects through complex media.

关键词： complex media edge detection spiral phase contrast imaging

Ultra-robust informational metasurfaces based on spatial coherence structures engineering

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Light(Science & Applications) 2024年第7期13卷 1310-1319页

作者： Leixin Liu Wenwei Liu Fei Wang Xiaofeng Peng Duk-Yong Choi Hua Cheng yangjian cai Shuqi Chen Shandong Provincial Engineering and Technical Center of Light Manipulations Collaborative Innovation Center of Light Manipulation and ApplicationsShandong Provincial Key Laboratory of Optics and Photonic DeviceSchool of Physics and ElectronicsShandong Normal UniversityJinan 250014China. The Key Laboratory of Weak Light Nonlinear Photonics Ministry of EducationSchool of PhysicsSchool of Materials Science and EngineeringSmart Sensing Interdisciplinary Science CenterNankai UniversityTianjin 300071China. School of Physical Science and Technology Soochow UniversitySuzhou 215006China. Laser Physics Centre Research School of PhysicsAustralian National UniversityCanberraACT 2601Australia. The Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuanShanxi 030006China

Optical information transmission is vital in modern optics and photonics due to its concurrent and multi-dimensional nature,leading to tremendous applications such as optical microscopy,holography,and optical *** optical information transmission technologies suffer from bulky optical setup and information loss/crosstalk when meeting scatterers or obstacles in the light ***,we theoretically propose and experimentally realize the simultaneous manipulation of the coherence lengths and coherence structures of the light beams with the disordered *** ultra-robust optical information transmission and self-reconstruction can be realized by the generated partially coherent beam with modulated coherence structure even 93%of light is recklessly obstructed during light transmission,which brings new light to robust optical information transmission with a single *** method provides a generic principle for the generalized coherence manipulation on the photonic platform and displays a variety of functionalities advancing capabilities in optical information transmission such as meta-holography and imaging in disordered and perturbative media.

关键词： optics coherent holography

Symmetry-broken silicon disk array as an efficient terahertz switch working with ultra-low optical pump power

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Chinese Physics B 2020年第8期29卷 72-77页

作者： Zhanghua Han Hui Jiang Zhiyong Tan Juncheng Cao yangjian cai Shandong Provincial Key Laboratory of Optics and Photonic Devices School of Physics and ElectronicsShandong Normal UniversityJinan 250358China Key Laboratory of Terahertz Solid-State Technology Shanghai Institute of Microsystems and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

The advancement of terahertz technology in recent years and its applications in various fields lead to an urgent need for functional terahertz components,among which a terahertz switch is one example of the most importance because it provides an effective interface between terahertz signals and information in another physical *** date many types of terahertz switches have been investigated mainly in the form of metamaterials made from metallic structures and optically-active ***,these reported terahertz switches usually suffer from an inferior performance,e.g.,requiring a high pump laser power density due to a low quality factor of the metallic metamaterial *** this paper,we report and numerically investigate a symmetry-broken silicon disk based terahertz resonator array which exhibits one resonance with ultrahigh quality factor for normal incidence of the terahertz *** resonance,which can never be excited for regular circular Si disks,can help to realize a superior terahertz switch with which only an ultra-low optical pump power density is required to modify the free carrier concentration in Si and its refractive index in the terahertz *** findings demonstrate that to realize a high terahertz transmittance change from 0 to above 50%,the required optical pump power density is more than 3 orders of magnitude smaller than that required for a split-ring resonator(SRR)based terahertz switch reported in the literature.

关键词： silicon disk symmetry-broken terahertz switch photocarrier bound state in continuum

Economical generation of high-quality optical vortices with gradual-width Fermat spiral slit mask

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Science China(Physics,Mechanics & Astronomy) 2023年第4期66卷 75-83页

作者： Qi Huang Xingyuan Lu Hao Zhang Zhuoyi Wang Yuanjie Yang Qiwen Zhan yangjian cai ChengLiang Zhao School of Physical Science and Technology Soochow UniversitySuzhou 215006China School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shandong Provincial Engineering and Technical Center of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250358China

A general model for creating an optical vortex using a variable-width Fermat spiral slit(FSS)mask was *** generated optical vortex demonstrates much better quality than those produced by slits with a uniform *** depth of focus was nearly doubled,which can be explained by discretizing the gradual-width *** demonstrate the generation robustness,the slits were printed on a transparent slide,and an output vortex beam with greater than 98%intensity purity was *** the high quality and simplicity of this vortex generation method,its analysis and generation scheme are expected to be extended to generation of plasmonic vortices and short-wavelength light sources such as X-rays and electron *** of highquality optical vortex beams at an almost negligible cost will make investigation much more accessible.

关键词： optical vortex gradual-width Fermat spiral slit high quality economical generation