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Scatterings from surface plasmons to propagating waves at plasmonic discontinuities

Science Bulletin 2019年第12期64卷 802-807页

作者： Fuxin Guan Shulin Sun shiyi xiao Qiong He Lei Zhou Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) and State Key Laboratory of Surface Physics Fudan UniversityShanghai 200433China Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing and Department of Optical Science and Engineering Fudan UniversityShanghai 200433China Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

Surface plasmon polaritons (SPPs) and their low-frequency counterpart spoof SPPs have attracted intensive interests in sciences [1,2], due to their unprecedented capabilities to confine electromagnetic (EM) fields at deep-subwavelength scale, leading to many applications such as super-resolution imaging [3], plasmonic lasers [4], surfaced-enhanced Raman effect [5], plasmonic waveguides [6,7] or circuits [8], etc. In practice, scatterings of SPPs to propagating waves (PWs) are inevitable as SPPs encounter discontinuities (say, interfaces between two different plasmonic systems). Such scatterings can lead to undesired radiation losses which should be avoided, especially in those applications employing SPPs as information carriers (say, plasmonic waveguides and nano-circuits [6–8]). Meanwhile, SPP-PW scatterings can also be utilized to achieve certain desired functionalities. For example, one can purposely place a set of carefully designed scatters on a plasmonic surface to scatter SPPs, generating fascinating effects such as holograms, focusing, or even directional radiations [9,10]. However, theoretical understandings on the inherent physics governing SPP-PW scatterings are far from satisfactory. Without a simple picture on such processes, people usually have to rely on full-wave simulations to optimize the devices to either suppress or utilize the SPP-PW scatterings. Although several theoretical approaches were proposed to study the SPP transmission/ reflection behaviors at certain plasmonic interfaces [11,12], the SPP-PW scatterings are usually overlooked. Moreover, since PWs have infinite channels to transport in free space, it is difficult to derive an analytical formula to describe such SPP-PW processes.

关键词： Surface plasmon polaritons(SPPs) electromagnetic(EM) propagating waves(PWs)

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High-performance meta-devices based on multilayer meta-atoms:interplay between the number of layers and phase coverage

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Science Bulletin 2019年第12期64卷 823-835页

作者： Bowen Yang Tong Liu Huijie Guo shiyi xiao Lei Zhou Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication Shanghai UniversityShanghai 200444China State Key Laboratory of Surface Physics Key Laboratory of Micro and Nano Photonic StructuresPhysics DepartmentFudan UniversityShanghai 200433China Shanghai Institute for Advanced Communication and Data Science Shanghai UniversityShanghai 200444China

Transmissive metasurfaces have provided an efficient platform to manipulate electromagnetic(EM)waves, but previously adopted multilayer meta-atoms are too thick and/or the design approach fully relies on brute-force simulations without physical understandings. Here, based on coupled-mode theory(CMT) analyses on multilayer meta-atoms of distinct types, it is found that meta-atoms of a specific type only allows the phase coverage over a particular range, thus suitable for polarization-control ***, combinations of meta-atoms with distinct types are necessary for building ultra-thin wavefront-control meta-devices requiring 360° phase coverage. Based on these physical understandings,high-efficiency meta-atoms are designed/fabricated, and used to construct three typical meta-devices,including quarter-and half-wave plates and a beam deflector. Our results elucidate the physics underlying the interplay between thicknesses and performances of transmissive metasurfaces, which can guide the realizations of miniaturized transmissive meta-devices in different frequency domains.

关键词： Metasurface Transparent window Wave plate Beam deflector

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Innovation,financial permeation,and income inequality:From a dynamicperspective in China

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Journal of Management Science and Engineering 2024年第2期9卷 220-238页

作者： Xianming Sun shiyi xiao Ganlin Wang xiaohang Ren School of Finance Zhongnan University of Economics and LawWuhan430073China Innovation and Talent Base for Digital Technology and Finance Wuhan430073China School of Business Central South UniversityChangsha410083China

Innovation is a driving force of wealth *** explore its time-varying effect on income inequality,we propose a nonparametric model using the local linear dummy variable estimation(LLDVE)*** on province-level panel data from China spanning from 2006 to 2020,we find that innovation initially reduces income disparity until 2009,then exacerbates it from 2013 to 2016,and alleviates inequality again over *** further verify that financial permeation serves as a catalyst in the inequitable income distribution driven by ***,this moderating effect reverses the relationship between green innovation and income *** suggests that we should enhance the financial service towards all aspects of innovation beyond its support of green innovation.

关键词： Income inequality Innovation Financial permeation Time-varying relationship Local linear dummy variable estimation(LLDVE)

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Tailoring the lineshapes of coupled plasmonic systems based on a theory derived from first principles

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Light(Science & Applications) 2020年第1期9卷 510-520页

作者： Jing Lin Meng Qiu Xiyue Zhang Huijie Guo Qingnan Cai shiyi xiao Qiong He Lei Zhou State Key Laboratory of Surface Physics Key Laboratory of Micro and Nano Photonic Structures(Ministry of Education)and Department of PhysicsFudan UniversityShanghai 200433China Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai Institute for Advanced Communication and Data ScienceShanghai UniversityShanghai 200444China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

Coupled photonic systems exhibit intriguing optical responses attracting intensive attention,but available theoretical tools either cannot reveal the underlying physics or are empirical in ***,we derive a rigorous theoretical framework from first principles(i.e.,Maxwell’s equations),with all parameters directly computable via wave function integrations,to study coupled photonic systems containing multiple *** calculations against Mie theory reveal the physical meanings of the parameters defined in our theory and their mutual *** testing our theory numerically and experimentally on a realistic plasmonic system,we show how to utilize it to freely tailor the lineshape of a coupled system,involving two plasmonic resonators exhibiting arbitrary radiative losses,particularly how to create a completely“dark”mode with vanishing radiative loss(e.g.,a bound state in continuum).All theoretical predictions are quantitatively verified by our experiments at near-infrared *** results not only help understand the profound physics in such coupled photonic systems,but also offer a powerful tool for fast designing functional devices to meet diversified application requests.

关键词： theory principles radiative

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Engineering single-molecule fluorescence withasymmetric nano-antennas

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Light(Science & Applications) 2021年第5期10卷 858-866页

作者： Wenqi Zhao xiaochaoran Tian Zhening Fang shiyi xiao Meng Qiu Qiong He Wei Feng Fuyou Li Yuanbo Zhang Lei Zhou Yan-Wen Tan State Key Laboratory of Surface Physics and Department of Physics Fudan UniversityShanghai 200433China Shanghai Institute for Advanced Communication and Data Science Shanghai UniversityShanghai 200444China Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai UniversityShanghai 200444China Department of Chemistry and State Key Laboratory of Molecular Engineering of Polymers Fudan UniversityShanghai 200433China Institute for Nanoelectronic Devices and Quantum Computing Fudan UniversityShanghai 200433China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China Multiscale Research Institute of Complex Systems Fudan UniversityShanghai 200433China

As a powerful tool for studying molecular dynamics in bioscience,single-molecule fluorescence detection providesdynamical information buried in ensemble *** in the near-infrared(NIR)is particularly usefulbecause it offers higher signal-to-noise ratio and increased penetration depth in tissue compared with *** low quantum yield of most NIR fluorophores,however,makes the detection of single-moleculefluorescence ***,we use asymmetric plasmonic nano-antenna to enhance the fluorescence intensity ofAlEE1000,a typical NIR dye,by a factor up to *** asymmetric nano-antenna achieve such an enhancement mainlyby increasing the quantum yield(to~80%)rather than the local field,which degrades the molecules'*** coupled-mode-theory analysis reveals that the enhancements stem from resonance-matching between antennaand molecule and,more importantly,from optimizing the coupling between the near-and far-ield modes withdesigner asymmetric *** work provides a universal scheme for engineering single-molecule fluorescence inthe near-infrared regime.

关键词： stability. asymmetric quantum

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Cascaded metasurfaces enabling adaptive aberration corrections for focus scanning

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Opto-Electronic Advances 2024年第10期7卷 28-39页

作者： xiaotong Li xiaodong Cai Chang Liu Yeseul Kim Trevon Badloe Huanhuan Liu Junsuk Rho shiyi xiao Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai Institute for Advanced Communication and Data ScienceShanghai UniversityShanghai 200240China Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Graduate School of Artificial Intelligence Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518055China Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Electrical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics Pohang 37673Republic of Korea.

Scanning focused light with corrected aberrations holds great importance in high-precision optical ***,conventional optical systems,relying on additional dynamical correctors to eliminate scanning aberrations,inevitably result in undesired bulkiness and *** this paper,we propose achieving adaptive aberration corrections coordinated with focus scanning by rotating only two cascaded transmissive *** metasurface is carefully designed by searching for optimal phase-profile parameters of three coherently worked phase functions,allowing flexible control of both the longitudinal and lateral focal position to scan on any custom-designed curved *** proof-ofconcept,we engineer and fabricate two all-silicon terahertz meta-devices capable of scanning the focal spot with adaptively corrected *** results demonstrate that the first one dynamically scans the focal spot on a planar surface,achieving an average scanning aberration of 1.18%within the scanning range of±30°.Meanwhile,the second meta-device scans two focal points on a planar surface and a conical surface with 2.5%and 4.6%scanning aberrations,*** work pioneers a breakthrough pathway enabling the development of high-precision yet compact optical devices across various practical domains.

关键词： terahertz focus scanning aberration correction dielectric metasurface

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Clinical and CT Histological Diagnosis of Orbital Tumors

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Journal of Huazhong University of Science and Technology(Medical Sciences) 2000年第1期20卷 82-85页

作者：胡燕华王洁肖诗艺 Department of Ophthalmology Xiehe Hospital Tongji Medical University Wuhan

Summary: The clinical manifestation and characteristics of CT image of 117 cases of orbital tumors in our hospital were investigated. The hemangioma had the highest incidence, and the less common tumors were, in sequence of incidence, pseudotumor, dermoid cysts, neurilemmoma, polymorphous adenoma and meningioma. The sensitivity in diagnosis of orbital tumor by CT was 93. 3 %. The coincidence of CT histological diagnosis with pathology were 83. 3 %, 82. 6% and 71. 4 % for dermoid cysts, hemangioma, and pseudotumor respectively, but the general coincidence of CT histological diagnosis with pathology was only 67. 8 %. When CT was combined with ultrasound, cytological examination and clinical manifestations, the accuracy of histological diagnosis could be improved to 83.3%.

关键词： orbital tumors CT histological diagnosis

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后疫情时代重大突发公共卫生事件信息公开质量影响因素分析——立足公众视角

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图书情报工作 2021年第23期65卷 41-49页

作者：肖诗依文庭孝中南大学生命科学学院生物医学信息学系长沙410013

[目的/意义]信息公开透明是应对信息疫情最有效的方法,质量是其生命线,以新冠肺炎疫情应对过程中信息公开质量成效检视为起点,探究重大突发公共卫生事件信息公开质量的影响因素,为提高重大突发公共卫生事件信息公开质量提供参考。[方法... 详细信息

[目的/意义]信息公开透明是应对信息疫情最有效的方法,质量是其生命线,以新冠肺炎疫情应对过程中信息公开质量成效检视为起点,探究重大突发公共卫生事件信息公开质量的影响因素,为提高重大突发公共卫生事件信息公开质量提供参考。[方法/过程]立足用户体验,通过半结构化访谈收集原始资料,以信息生态、危机管理理论为基础,运用探索性质性研究方法对公众视角下后疫情时代重大突发公共卫生事件信息公开质量影响因素进行关系梳理,并构建理论模型。[结果/结论]阐明后疫情时代公开主体、信息本身、信息技术和环境4个维度的核心因素对重大突发公共卫生事件信息公开质量的影响及作用机制,指出事前公开信息的安抚性、事中相关专业知识的故事性、事后的信息总结性、运用信息技术提升信息公开内容的知识含量和公开方式的智能化等是后疫情时代重大突发公共卫生事件信息公开质量的特有要素,以期为重大突发公共卫生事件提升信息公开质量提供理论和实践指导。

关键词：后疫情时代重大突发公共卫生事件扎根理论影响因素

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突发公共卫生事件信息公开融合关键要素研究:供需适配性视角

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情报理论与实践 2022年第9期45卷 75-82页

作者：肖诗依文庭孝朱红灿中南大学生命科学学院生物医学信息学系湖南长沙410013 湘潭大学公共管理学院湖南湘潭411105

[目的/意义]识别分析突发公共卫生事件信息公开融合关键要素,以提高突发公共生事件信息公开质量。[方法/过程]文章基于供需适配性理论,分析和构建相关性、可及性、质量性、相适性4个维度下的突发公共卫生事件信息公开融合要素体系,使用D... 详细信息

[目的/意义]识别分析突发公共卫生事件信息公开融合关键要素,以提高突发公共生事件信息公开质量。[方法/过程]文章基于供需适配性理论,分析和构建相关性、可及性、质量性、相适性4个维度下的突发公共卫生事件信息公开融合要素体系,使用DEMATEL方法识别出关键要素。[结果/结论]共发现13个关键因素,其中政府具有信息公开融合意识等要素为特有要素,以期为突发公共卫生事件提升信息公开融合质量提供理论与实践指导。

关键词：突发公共卫生事件信息公开融合关键要素供需适配性理论

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Dynamically controlling terahertz wavefronts with cascaded metasurfaces

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Advanced Photonics 2021年第3期3卷 93-102页

作者： xiaodong Cai Rong Tang Haoyang Zhou Qiushi Li Shaojie Ma Dongyi Wang Tong Liu xiaohui Ling Wei Tan Qiong He shiyi xiao Lei Zhou Shanghai University Key Laboratory of Specialty Fiber Optics and Optical Access NetworksJoint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai Institute for Advanced Communication and Data ScienceShanghaiChina Fudan University State Key Laboratory of Surface PhysicsKey Laboratory of Micro and Nano Photonic Structures(Ministry of Education)and Physics DepartmentShanghaiChina Hengyang Normal University College of Physics and Electronic EngineeringHengyangChina CAEP Microsystem and Terahertz Research CenterChengduChina CAEP Institute of Electronic EngineeringMianyangChina Fudan University Academy for Engineering and TechnologyShanghaiChina Collaborative Innovation Centre of Advanced Microstructures NanjingChina

Dynamically controlling terahertz(THz)wavefronts in a designable fashion is highly desired in ***,available methods working at microwave frequencies do not work well in the THz regime due to lacking suitable tunable elements with submicrometer ***,instead of locally controlling individual meta-atoms in a THz metasurface,we show that rotating different layers(each exhibiting a particular phase profile)in a cascaded metadevice at different speeds can dynamically change the effective Jonesmatrix property of the whole device,thus enabling extraordinary manipulations on the wavefront and polarization characteristics of a THz beam impinging on the *** illustrating our strategy based on model calculations,we experimentally demonstrate two proof-of-concept metadevices,each consisting of two carefully designed all-silicon transmissive metasurfaces exhibiting different phase *** two metasurfaces inside the fabricated devices at different speeds,we experimentally demonstrate that the first metadevice can efficiently redirect a normally incident THz beam to scan over a wide solid-angle range,while the second one can dynamically manipulate both the wavefront and polarization of a THz *** results pave the way to achieving dynamic control of THz beams,which is useful in many applications,such as THz radar,and bio-and chemical sensing and imaging.

关键词： terahertz beam-steering dielectric metasurfaces linear gradient phase

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