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Coherence entropy during propagation through complex media

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Advanced Photonics 2024年第4期6卷 25-35页

作者： Xingyuan Lu Zhuoyi Wang qiwen zhan Yangjian Cai Chengliang Zhao Soochow University School of Physical Science and Technology Jiangsu Key Laboratory of Frontier Material Physics and Devices University of Shanghai for Science and Technology School of Optical-Electrical and Computer Engineering Shandong Normal University School of Physics and Electronics Shandong Provincial Engineering and Technical Center of Light ManipulationsShandong Provincial Key Laboratory of Optics and Photonic Device East China Normal University Joint Research Center of Light Manipulation Science and Photonic Integrated Chip of East China Normal University and Shandong Normal University

The deformation, flicker, and drift of a light field owing to complex media such as a turbulent atmosphere have limited its practical applications. Thus, research on invariants in randomly fluctuated light fields has garnered considerable attention in recent years. Coherence is a statistical property of light,while its full and quantitative characterization is challenging. Herein, we successfully realize the orthogonal modal decomposition of partially coherent beams and introduce the application of coherence entropy as a global coherence characteristic of such randomly fluctuated light fields. It is demonstrated that coherence entropy remains consistent during propagation in a unitary system by unraveling complex channels. As representative examples, we study the robustness of coherence entropy for partially coherent beams as they propagate through deformed optical systems and turbulent media. Coherence entropy is anticipated to serve as a key metric for evaluating the propagation of partially coherent beams in complex channels. This study paves the way for a broader application scope of a customized low-coherence light field through nonideal optical systems and complex media.

关键词： Global system for mobile communications Atmospheric propagation Modal decomposition Matrices Turbulence Physical coherence Deformation Partial coherence Spherical lenses Optical coherence

Quantum integrated nonlocal sensing of dynamic object

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Science China(Physics,Mechanics & Astronomy) 2024年第7期67卷 187-187页

作者： Jiachen Liu qiwen zhan School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China

In recent years,the application of quantum technology for imaging and information acquisition of objects has emerged as a prominent and extensively studied topic among researchers[1].Several well-established technical... 详细信息

关键词： ghost Quantum Sever

Single-shot phase retrieval for randomly fluctuated and obstructed vortex beams

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Science China(Physics,Mechanics & Astronomy) 2024年第4期67卷 72-80页

作者： Hao zhang Jun’an Zhu Xingyuan Lu Zhiquan Hu Jianbo Gao Kun Liu qiwen zhan Yangjian Cai Chengliang Zhao School of Physical Science and Technology Soochow UniversitySuzhou 215006China 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 DeviceSchool of Physics and ElectronicsShandong Normal UniversityJinan 250358China Joint Research Center of Light Manipulation Science and Photonic Integrated Chip of East China Normal University and Shandong Normal University East China Normal UniversityShanghai 200241China

Vortex beams with orbital angular momentum play a crucial role in increasing the information capacity in optical *** magnitude of orbital angular momentum determines the ability of information *** practice,a vortex beam can encounter random objects or turbulence during free-space propagation,resulting in information ***,accurately measuring the orbital angular momentum of a randomly fluctuated and obstructed vortex beam is a considerable ***,we propose a single-shot method for the phase retrieval of a randomly fluctuated and obstructed vortex beam by combining the phase-shift theorem and self-reference *** results reveal that the sign and magnitude of the initial orbital angular momentum can be simultaneously determined based on their quantitative relation with the number of coherence singularities on the observation plane,thus addressing the effects of random occlusion and atmospheric *** proposed method considerably improved the accurate decoding of orbital angular momentum information in nonideal freespace optical communications.

关键词： optical vortex phase retrieve orbital angular momentum measurement antiturbulence antidisturbance

Coherence phase spectrum analyzer for a randomly fluctuated fractional vortex beam

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Photonics Research 2024年第1期12卷 33-39页

作者： ZHUOYI WANG XINGYUAN LU JIANBO GAO XUECHUN ZHAO qiwen zhan YANGJIAN CAI CHENGLIANG ZHAO School of Physical Science and Technology Soochow UniversitySuzhou 215006China 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 Shandong Joint Research Center of Light Manipulation Science and Photonics Integrated Chip of East China Normal University and Shandong Normal University East China Normal UniversityShanghai 200241China

Fractional vortex beams exhibit a higher degree of modulation dimensions than conventional vortices,thus inheriting superior anti-turbulent transmission properties through the incorporation of additional coherence ***,aliasing the mixed modes induced by coherence degradation makes the quantitative measurement of the topological charge in fractional vortex beams *** this study,a coherence phase spectrum was introduced,and experimental demonstrations to quantitatively determine the fractional topological charge of partially coherent fractional vortex beams were *** leveraging the four-dimensional measurement of a partially coherent light field,the source coherence function was inversely reconstructed,and fractional topological charges were determined with high precision by extracting the phase spectrum of the coherence ***–Gaussian,elliptical Gaussian,and plane-wave-fraction vortex beams with various degrees of coherence were used to demonstrate measurement *** proposed method is applicable to X-rays and electron *** has potential applications in optical encryption,high-capacity optical communication,and quantum entanglement.

关键词： function fractional vortex

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基于转角系统的可重构相干纳米激光阵列

科学通报 2024年第10期69卷 1245-1247页

作者：顾亮亮詹其文上海理工大学光电信息与计算机工程学院上海200093 张江实验室上海201204

自1960年7月梅曼发明第一台激光器以来,追求高性能和微型化的激光从未停止,特别是半导体激光,已成为信息技术的核心器件之一[1,2].微型化激光的相关研究始于20世纪90年代,研究人员发现,激光尺寸越小,其自发辐射速率越快且耦合因子越大,... 详细信息

自1960年7月梅曼发明第一台激光器以来,追求高性能和微型化的激光从未停止,特别是半导体激光,已成为信息技术的核心器件之一[1,2].微型化激光的相关研究始于20世纪90年代,研究人员发现,激光尺寸越小,其自发辐射速率越快且耦合因子越大,故调制速率更快且阈值更低[3].因此,追求体积小、速度快、功耗低的微型激光一直是激光领域的研究热点之一.21世纪初,研究人员陆续发明了纳米线激光、微盘激光和光子晶体缺陷态激光,这些微型化激光的特征尺寸约为一个真空波长[4~6];2009年创造的等离激元纳米激光则又将其特征尺寸下降了一个数量级,仅为真空波长的1/10[7].

关键词：激光领域调制速率特征尺寸半导体激光等离激元梅曼激光阵列耦合因子

携带横向轨道角动量的时空局域波包的传输特性(特邀)

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光学学报 2024年第10期44卷 294-300页

作者：张年佳曹前 Chong Andy 詹其文上海理工大学光电信息与计算机工程学院上海200093 釜山国立大学物理系韩国釜山46241

光学轨道角动量(OAM)可以纵向OAM的形式存在于空间涡旋光束中,或以横向OAM的形式存在于时空光涡旋波包中。与涡旋光束不同,时空光涡旋波包在传播过程中同时受到衍射和色散效应的影响,造成波包在时空域内的展宽,并且时空光涡旋波包携带... 详细信息

光学轨道角动量(OAM)可以纵向OAM的形式存在于空间涡旋光束中,或以横向OAM的形式存在于时空光涡旋波包中。与涡旋光束不同,时空光涡旋波包在传播过程中同时受到衍射和色散效应的影响,造成波包在时空域内的展宽,并且时空光涡旋波包携带的横向OAM也会在传播过程中分裂。这两点限制了横向OAM在其他研究领域的应用。本文引入并研究了携带横向OAM的三维时空局域波包,此波包可以同时克服衍射与色散效应造成的时空域三维变化。在传播过程中,该时空局域波包的时空域分布不变,且在遇到障碍物后也能快速重新恢复到原有的状态,具有传播不变以及自恢复的特性。本文对时空局域波包的传播过程以及经过障碍物后的恢复过程进行了数值模拟仿真,证实了其传播不变特性和自恢复特性。这种携带横向OAM的三维时空局域波包为横向OAM未来的利用提供了新的机遇,有望应用于光通信、量子光学、光学成像等领域。

关键词：横向光学轨道角动量三维时空局域波包传播不变自恢复

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强聚焦高阶时空涡旋的生成方法及其传播特性

光学学报 2024年第10期44卷 338-346页

作者：于自强莫德威于飞詹其文陈建上海理工大学光电信息与计算机工程学院上海200093 上海理工大学上海市现代光学系统重点实验室上海200093 中国科学院上海光学精密机械研究所高功率激光单元技术实验室上海201800 国科大杭州高等研究院物理与光电工程学院浙江杭州310024

主要研究了经高数值孔径物镜强聚焦生成高阶时空涡旋的方法及高度局域时空涡旋在焦平面前后的传播特性。根据模式转换理论,对入射波包进行预处理,利用Richards Wolf矢量衍射公式仿真计算预处理后的入射波包以及经透镜强聚焦后在焦平面... 详细信息

主要研究了经高数值孔径物镜强聚焦生成高阶时空涡旋的方法及高度局域时空涡旋在焦平面前后的传播特性。根据模式转换理论,对入射波包进行预处理,利用Richards Wolf矢量衍射公式仿真计算预处理后的入射波包以及经透镜强聚焦后在焦平面及焦平面前后传播的时空波包的三维时空分布,并对其强度和相位进行了分析。结果表明,强聚焦波包具有预定的高阶时空螺旋相位,且在透镜焦平面前后传播过程中,时空波包的总拓扑荷数保持不变,波包强度分布发生旋转,波包内部演化出若干个一阶时空相位奇点。

关键词：物理光学轨道角动量时空光涡旋强聚焦光束传播拓扑荷数

Field enhancement analysis of an apertureless near field scanning optical microscope probe with finite element method

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Chinese Optics Letters 2007年第12期5卷 709-711页

作者： Weibin Chen qiwen zhan Electro-Optics Graduate Program University of Dayton 300 College Park Dayton Ohio 45469-0245 USA

Plasmonic field enhancement in a fully coated dielectric near field scanning optical microscope （NSOM） probe under radial polarization illumination is analyzed using an axially symmetric three-dimensional （3D） finite element method （FEM） model. The enhancement factor strongly depends on the illumination spot size, taper angle of the probe, and the metal film thickness. The tolerance of the alignment angle is investigated. Probe designs with different metal coatings and their enhancement performance are studied as well. The nanometric spot size at the tip apex and high field enhancement of the apertureless NSOM

关键词： Field enhancement Finite element method Metrology Near field scanning optical microscopy Polarization Rayleigh scattering

Vectorial optical fields： recent advances and future prospects

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Science Bulletin 2018年第1期63卷 54-74页

作者： Jian Chen Chenhao Wan qiwen zhan School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai 200093 China Department of Electro-Optics and Photonics University of Dayton Dayton OH 45469 USA School of Electronic Engineering University of Electronic Science and Technology of China Chengdu 611731 China School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074 China

Driven by their potential applications, vectorial optical fields with spatially inhomogeneous states of polarization within the cross section have drawn significant attention recently. This work intends to review some of the latest development of this rapidly growing field of optics and offer a general overview of the current status of this field in a few areas. Mathematical descriptions of generalized vectorial optical fields are provided along with several special examples. A time-reversal methodology for the creation of a wide variety of exotic optical focal fields with prescribed characteristics within the focal volume is presented. Recently developed methods for the generation of vectorial optical fields that utilize fiber lasers,digital lasers, vectorial optical field generator, metasurfaces or photoalignment liquid crystals are summarized. The interactions of these vectorial optical fields with various micro-and nano-structures are presented and the prospects of their potential applications are discussed. The connection of vectorial optical fields with higher dimensionality in quantum information is summarized.

关键词： Vectorial optical field Cylindrical vector beam Full Poincaré beam Spatial light modulator Metasurface Spin-orbit interaction Quantum information Quantum communication