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Robust far-field imaging by spatial coherence engineering

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Opto-Electronic Advances 2021年第12期4卷 15-24页

作者： Yonglei Liu Yahong Chen Fei Wang Yangjian Cai Chunhao Liang olga korotkova 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 Collaborative Innovation Center of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China School of Physical Science and Technology Soochow UniversitySuzhou 215006China Department of Physics University of MiamiCoral GablesFlorida 33146USA.

The degree of coherence(DOC)function that characterizes the second-order correlations at any two points in a light field is shown to provide a new degree of freedom for carrying information.As a rule,the DOC varies along the beam propagation path,preventing from the efficient information recovery.In this paper,we report that when a partially coher-ent beam carrying a cross phase propagates in free space,in a paraxial optical system or in a turbulent medium,the modulus of the far-field(focal plane)DOC acquires the same value as it has in the source plane.This unique propaga-tion feature is employed in a novel protocol for far-field imaging via the DOC,applicable to transmission in both free-space and turbulence.The advantages of the proposed approach are the confidentiality and resistance to turbulence,as well as the weaker requirement for the beam alignment accuracy.We demonstrate the feasibility and the robustness of the far-field imaging via the DOC in the turbulent media through both the experiment and the numerical simulations.Our findings have potential applications in optical imaging and remote sensing in natural environments,in the presence of op-tical turbulence.

关键词： degree of coherence cross phase optical imaging

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部分相干电磁光束的光谱交叉偏振度

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光子学报 2009年第8期38卷 2093-2098页

作者：张国文蒲继雄 Serkan Sahin olga korotkova 华侨大学信电子科学与技术系福建泉州362021 Department of Physics University of MiamiCoral Gables

基于光谱交叉偏振度新理论,研究了部分相干光束在传输过程中光谱交叉偏振度的变化情况.采用相干偏振统一理论和广义惠更斯-菲涅耳原理,推导部分相干电磁高斯-谢尔模型光束在自由空间传输时任意空间两点的交叉谱密度矩阵的解析式.研究表... 详细信息

基于光谱交叉偏振度新理论,研究了部分相干光束在传输过程中光谱交叉偏振度的变化情况.采用相干偏振统一理论和广义惠更斯-菲涅耳原理,推导部分相干电磁高斯-谢尔模型光束在自由空间传输时任意空间两点的交叉谱密度矩阵的解析式.研究表明,光谱交叉偏振度的值不再仅仅局限在0～1之间,而是可为任意的非负值.传输场中的光谱交叉偏振度与光源相关参量,初始偏振度和传输距离紧密相关.当光束经过足够长的传输距离后,轴上光谱交叉偏振度不再发生变化,而是趋向一个稳定值.保持光谱交叉偏振度不变的条件与一般偏振度相同.

关键词：部分相干电磁光束光谱交叉偏振度相干偏振统一理论自由空间

Optimizing illumination's complex coherence state for overcoming Rayleigh's resolution limit

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Chinese Optics Letters 2021年第5期19卷 65-70页

作者：梁春豪 Yashar E.Monfared 刘欣齐宝鑫王飞 olga korotkova 蔡阳健 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 Department of Chemistry Dalhousie UniversityHalifaxNS B3H 4R2Canada School of Physical Science and Technology&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow UniversitySuzhou 215006China Department of Physics University of MiamiCoral GablesFlorida 33146USA

We suggest tailoring of the illumination's complex degree of coherence for imaging specific two-and three-point objects with resolution far exceeding the Rayleigh limit.We first derive a formula for the image intensity via the pseudo-mode decomposition and the fast Fourier transform valid for any partially coherent illumination(Schell-like,non-uniformly correlated,twisted)and then show how it can be used for numerical image manipulations.Further,for Schell-model sources,we show the improvement of the two-and three-point resolution to 20%and 40%of the classic Rayleigh distance,respectively.

关键词： optical coherence imaging light manipulation