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stokes identification in an atomic ensemble using a filtering system

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Chinese Physics B 2009年第11期18卷 4702-4706页

作者：罗霄鸣宁波陈丽清周玥钟志萍蒋硕 Physics Department Tsinghua University Physics Department Nanjing University College of Physical Sciences Graduate University of Chinese Academy of Sciences

Polarization filtering and atomic cell filtering are applied in the identification of stokes signals in an atomic ensemble, and reduce the noise to a level of 10-5 and 10-4 respectively. Good stokes signals are then obtained. In this article the two filtering systems and the final stokes output are presented, and the optimization of the polarization filtering system is highlighted.

关键词： quantum communication stokes filtering

High efficiency all-dielectric pixelated metasurface for near-infrared full-stokes polarization detection

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Photonics Research 2021年第4期9卷 583-589页

作者： Chong Zhang Jingpei Hu Yangeng Dong Aijun Zeng Huijie Huang Chinhua Wang Laboratory of Information Optics and Optoelectronic Technology Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province and Key Laboratory of Modern Optical Technologies of Ministry of Education Soochow UniversitySuzhou 215006China

Pixelated metasurfaces integrating both the functions of linear polarization and circular polarization filters on a single platform can achieve full-stokes polarization detection.At present,the pixelated full-stokes metasurfaces mainly face the following problems:low transmission,low circular dichroism(CD)of circular polarization filters,and high requirements in fabrication and integration.Herein,we propose high performance ultracompact all-dielectric pixelated full-stokes metasurfaces in the near-infrared band based on silicon-on-insulator,which is compatible with the available semiconductor industry technologies.Circular polarization filters with high CD are achieved by using simple two-dimensional chiral structures,which can be easily integrated with the linear polarization filters on a single chip.In addition,the dielectric materials have higher transmission than metal materials with intrinsic absorption.We experimentally demonstrated the circular polarization filter with maximum CD up to 70%at a wavelength of 1.6μm and average transmission efficiency above 80%from 1.48μm to 1.6μm.Therefore,our design is highly desirable for many applications,such as target detection,clinical diagnosis,and polarimetric imaging and sensing.

关键词： polarization stokes dielectric

Large-area ultracompact pixelated aluminumwire-grid-based metamaterials for Vis-NIR full-stokes polarization imaging

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Photonics Research 2023年第11期11卷 1975-1986页

作者： YUANYI FAN JINKUI CHU RAN ZHANG CHUANLONG GUAN JIANYING LIU State Key Laboratory of High-performance Precision Manufacturing Dalian University of TechnologyDalian 116024China Key Laboratory for Micro/Nano Technology and System of Liaoning Province Dalian University of TechnologyDalian 116024China

The study of pixelated metamaterials that integrate both the functions of linear and circular polarization filters is rapidly growing due to the need for full-stokes polarization imaging. However, there is a lack of large-area, ultracompact pixelated full-stokes metamaterials with excellent performance, especially circular polarization filters with a high extinction ratio, a broad operating bandwidth, and a low-cost, high-quality, efficient manufacturing process, which limits the practical applications of pixelated full-stokes metamaterials. In this study, we propose a universal design and fabrication scheme for large-area, ultracompact pixelated aluminum wire-grid-based metamaterials used in Vis-NIR full-stokes polarization imaging. The aluminum wire-grid was designed as a linear polarization filter with an average linear polarization extinction ratio of 36,000 and a circular polarization filter with an average circular polarization extinction ratio of 110 in Vis-NIR. A large-area, ultracompact 320 × 320pixelated aluminum wire-grid-based full-stokes metamaterial was fabricated using nanoimprint lithography and nano transfer printing with the advantages of low cost and high efficiency. This metamaterial was used to achieve full-stokes polarization imaging with errors within 8.77%, 12.58%, 14.04%, and 25.96% for stokes parameters S_(0), S_(1), S_(2), and S_(3), respectively. The inversion errors of the compensated stokes parameters can be reduced to0.21%, 0.21%, 0.42%, and 1.96%, respectively.

关键词： polarization stokes lithography

ON THE P1 POWELL-SABIN DIVERGENCE-FREE FINITE ELEMENT FOR THE stokes EQUATIONS

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Journal of Computational Mathematics 2008年第3期26卷 456-470页

作者： Shangyou Zhang Department of Mathematical Sciences University of Delaware DE 19716 USA

The stability of the P1-P0 mixed-element is established on general Powell-Sabin triangular grids. The piecewise linear finite element solution approximating the velocity is divergence-free pointwise for the stokes equations. The finite element solution approximating the pressure in the stokes equations can be obtained as a byproduct if an iterative method is adopted for solving the discrete linear system of equations. Numerical tests are presented confirming the theory on the stability and the optimal order of convergence for the P1 Powell-Sabin divergence-free finite element method.

关键词： Powell Sabin triangles Mixed finite elements stokes Divergence-free element

Multifunctional geometric phase optical element for high-efficiency full stokes imaging polarimetry

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Photonics Research 2019年第9期7卷 1066-1074页

作者： YANMENG DAI YUQUAN ZHANG YOUPENG XIE DAPENG WANG XIANYOU WANG ITING LEI CHANGJUN MIN XIAOCONG YUAN Nanophotonics Research Center Shenzhen Key Laboratory of Micro-Scale Optical Information Technology Shenzhen University

Polarization imaging finds applications in many areas, such as photoelasticity, ellipsometry, and biomedical imaging. A compact, snapshot, and high-efficiency imaging polarimeter is highly desirable for many applications.Here, based on a single multifunctional geometric phase optical element(GPOE), a new method is proposed for high-efficiency snapshot imaging polarimetry. With tailored spatially varying orientation of each anisotropic unit cell, the GPOE works highly efficiently as both a spin sorter and a half-wave plate, enabling snapshot retrieving of a full stokes vector of incident light. The designed GPOE is implemented in the form of liquid crystal fabricated with a photo-alignment technology, and its application in imaging polarimetry is experimentally demonstrated by retrieving full stokes parameters of a cylinder vector beam. This method can also work in the form of plasmonic or dielectric metasurfaces, enabling ultra-compact polarization detection systems by monolithic integration with other devices such as metalenses.

关键词： red stokes Multifunctional geometric phase optical element for high-efficiency full stokes imaging polarimetry

Low threshold anti-stokes Raman laser on-chip

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Photonics Research 2019年第8期7卷 926-932页

作者： HYUNGWOO CHOI DONGYU CHEN FAN DU RENE ZETO ANDREA ARMANI Mork Family Department of Chemical Engineering and Materials Science University of Southern CaliforniaLos AngelesCalifornia90089USA Ming Hsieh Department of Electrical Engineering-Electrophysics University of Southern CaliforniaLos AngelesCalifornia90089USA

Raman lasers based on integrated silica whispering gallery mode resonant cavities have enabled numerous applications from telecommunications to biodetection. To overcome the intrinsically low Raman gain value of silica, these devices leverage their ultrahigh quality factors(Q), allowing submilliwatt stimulated Raman scattering(SRS) lasing thresholds to be achieved. A closely related nonlinear behavior to SRS is stimulated anti-stokes Raman scattering(SARS). This nonlinear optical process combines the pump photon with the SRS photon to generate an upconverted photon. Therefore, in order to achieve SARS, the efficiency of the SRS process must be high. As a result, achieving SARS in on-chip resonant cavities has been challenging due to the low lasing efficiencies of these devices. In the present work, metal-doped ultrahigh Q(Q > 10~7) silica microcavity arrays are fabricated on-chip. The metal-dopant plays multiple roles in improving the device performance. It increases the Raman gain of the cavity material, and it decreases the optical mode area, thus increasing the circulating intensity. As a result, these devices have SRS lasing efficiencies that are over 10× larger than conventional silica microcavities while maintaining low lasing thresholds. This combination enables SARS to be generated with submilliwatt input powers and significantly improved anti-stokes Raman lasing efficiency.

关键词： SRS Raman Low threshold anti-stokes Raman laser on-chip stokes

Behaviour of the stokes operators under domain perturbation Dedicated to Professor Jean-Yves Chemin on the Occasion of His 60th Birthday

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Science China Mathematics 2019年第6期62卷 1167-1174页

作者： Sylvie Monniaux Aix Marseille Université CNRS Centrale Marseille

Depending on the geometry of the domain, one can define—at least—three different stokes operators with Dirichlet boundary conditions. We describe how the resolvents of these stokes operators converge with respect to... 详细信息

关键词： domain perturbation stokes operator Dirichlet boundary conditions

Nanocrystals for large stokes shift-based optosensing

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Chinese Chemical Letters 2019年第10期30卷 1843-1848页

作者： Ronghui Zhou Xiaomei Lu Qin Yang Peng Wu State Key Laboratory of Oral Diseases West China Hospital of StomatologySichuan UniversityChengdu 610041China Analytical&Testing Center Sichuan UniversityChengdu 610064China College of Light Industry and Textile and Food Engineering Sichuan UniversityChengdu 610065China

stokes shift is an important feature of fluorescence, which reveals the energy loss between the excitation and the emission. For most fluorescent materials(e.g., organic dyes and proteins), the large overlap between the absorption and emission spectra endow them a small stokes shift that induced reabsorption by fluorophore itself. Although the self-absorption can be effectively reduced due to the emergence of fluorescent nanomaterials, fluorescence attenuation is still observed in aggregated or concentrated nanocrystals, causing reduced sensitivity of biosensors. Therefore, increasing the stokes shift can effectively improve the performance of nano-agents based biosensing. In this critical review, through understanding the stokes shift from the viewpoint of self-absorption, the influence of stokes shift on fluorescence properties are discussed. Based on the principle of changing the stokes shift of fluorescent nanomaterials, we described the methods for constructing various optically large stokes shift-based nanomaterials, and the application of these nanocrystals in biosensing is especially concerned in this review.

关键词： stokes shift Self-absorption Band gap Optical nanocrystals Biosensing

Distributed Lagrange Multiplier/Fictitious Domain Finite Element Method for a Transient stokes Interface Problem with Jump Coefficients

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Computer Modeling in Engineering & Sciences 2019年第4期119卷 35-62页

作者： Andrew Lundberg Pengtao Sun Cheng Wang Chen-song Zhang Department of Mathematical Sciences University of NevadaLas Vegas4505 Maryland ParkwayLas VegasNV 89154USA School of Mathematical Sciences Tongji UniversityShanghaiChina LSEC&NCMIS Academy of Mathematics and System ScienceBeijingChina

The distributed Lagrange multiplier/fictitious domain(DLM/FD)-mixed finite element method is developed and analyzed in this paper for a transient stokes interface problem with jump coefficients.The semi-and fully discrete DLM/FD-mixed finite element scheme are developed for the first time for this problem with a moving interface,where the arbitrary Lagrangian-Eulerian(ALE)technique is employed to deal with the moving and immersed subdomain.Stability and optimal convergence properties are obtained for both schemes.Numerical experiments are carried out for different scenarios of jump coefficients,and all theoretical results are validated.

关键词： Transient stokes interface problem jump coefficients distributed Lagrange multiplier fictitious domain method mixed finite element an optimal error estimate stability