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Chiral transmission by an open evolution trajectory in a non-Hermitian system

Light(Science & Applications) 2024年第4期13卷 628-636页

作者： Xiaoqian Shu Qi Zhong Kai Hong Oubo You Jian Wang guangwei hu Andrea Alù Shuang Zhang Demetrios N.Christodoulides Lin Chen Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China. Zhejiang Lab Hangzhou 311121China. CREOL College of Optics and PhotonicsUniversity of Central FloridaOrlandoFlorida 32816USA. Department of Physics The University of Hong KongHong KongChina. School of Electrical and Electronic Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore. Photonics Initiative Advanced Science Research CenterCity University of New YorkNew YorkNY 10031USA. Shenzhen huazhong University of Science and Technology Research Institute Shenzhen 518063China

Exceptional points(EPs),at which two or more eigenvalues and eigenstates of a resonant system coalesce,are associated with non-Hermitian Hamiltonians with gain and/or loss *** encircling of EPs has received significant interest in recent years,as it has been shown to lead to highly nontrivial phenomena,such as chiral transmission in which the final state of the system depends on the encircling ***,chiral transmission for a pair of eigenmodes has been realized by establishing a closed dynamical trajectory in parity-time-(PT-)or anti-PT-symmetric *** chiral transmission of symmetry-broken modes,more accessible in practical photonic integrated circuits,has been realized by establishing a closed trajectory encircling EPs in anti-PTsymmetric systems,the demonstrated transmission efficiency is very low due to path-dependent ***,we demonstrate chiral dynamics in a coupled waveguide system that does not require a closed ***,we explore an open trajectory linking two infinite points having the same asymptotic eigenmodes(not modes in PT-and anti-PT-symmetric systems),demonstrating that this platform enables high-efficiency chiral transmission,with each eigenmode localized in a single *** concept is experimentally implemented in a coupled silicon waveguide system at telecommunication *** work provides a new evolution strategy for chiral dynamics with superior performance,laying the foundation for the development of practical chiral-transmission devices.

关键词： chiral system symmetric

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政策工具视角下我国智慧社区政策特征分析与审思

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情报科学 2024年第2期42卷 24-34,55页

作者：俞露露张洪艳胡广伟南京大学信息管理学院江苏南京210023 南京大学政务数据资源研究所江苏南京210023

【目的/意义】政策工具是政策目标实现的抓手,从政策工具视角探析智慧社区政策特征,以促进新时期智慧社区政策体系和制度框架的构建。【方法/过程】通过构建“政策结构-政策工具-政策主题”三维框架模型,运用文本计量法、社会网络分析... 详细信息

【目的/意义】政策工具是政策目标实现的抓手,从政策工具视角探析智慧社区政策特征,以促进新时期智慧社区政策体系和制度框架的构建。【方法/过程】通过构建“政策结构-政策工具-政策主题”三维框架模型,运用文本计量法、社会网络分析法、内容分析法和LDA主题模型,对2012-2022年间106篇中央层面政策文本进行系统分析。【结果/结论】我国中央政策呈现发布量阶段性增长、发布主体多元化的特征;在政策工具的应用上,偏向于使用象征与劝诫型工具和能力建设型工具;政策工具与主题的适配性仍有待提升。建议进一步完善智慧社区政策体系、促进多元主体合作、优化政策工具的结构配置、强化政策工具与政策主题的契合度。【创新/局限】运用政策组合分析法,分别对政策结构属性和内容属性进行研究,为将来政策的科学制定提供理论参考,但并没有对央地政策差异、联系以及政策落实效能等内容进行研究,这些内容将作为后续努力的方向。

关键词：智慧社区政策工具 LDA主题模型政策结构社会网络分析

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现代农业与新型城镇化耦合发展的影响因素及实现机制

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农业技术与装备 2024年第2期 77-79页

作者：庄少奇胡光伟湖南工业大学城市与环境学院湖南株洲412000 大理大学经济与管理学院云南大理671003

在分析现代农业与新型城镇化本质特征的基础上,研究了两者的耦合发展机理,结合影响现代农业与新型城镇化耦合发展的主要因素,探究了现代农业与新型城镇化耦合发展的实现机制。

关键词：现代农业新型城镇化耦合发展影响因素实现机制

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Unidirectional bound states in the continuum in Weyl semimetal nanostructures

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Photonics Research 2022年第8期10卷 1828-1838页

作者： CHEN ZHAO guangwei hu YANG CHEN QING ZHANG YONGZHE ZHANG CHENG-WEI QIU Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore

Recently studied bound states in the continuum(BICs) enable perfect localization of light and enhance light–matter interactions although systems are optically open. They have found applications in numerous areas,including optical nonlinearity, light emitters, and nano-sensors. However, their unidirectional nature in nonreciprocal devices is still elusive because such trapping states are easily destroyed when the symmetry of an optical system is broken. Herein, we propose nonreciprocal and dynamically tunable BICs for unidirectional confinement of light and symmetry-protected BICs at Γ-point by introducing antiparallel magnetism into the optical system. We demonstrate that such BICs can be achieved by using topological magnetic Weyl semimetals near zero-index frequency without any structural asymmetry, and are largely tunable via modifying the Fermi *** results reveal a regime of extreme light manipulation and interaction with emerging quantum materials for various practical applications.

关键词： symmetry continuum unidirectional

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Mold-free self-assembled scalable microlens arrays with ultrasmooth surface and record-high resolution

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Light(Science & Applications) 2023年第7期12卷 1318-1326页

作者： Zhihao Liu guangwei hu huapeng Ye Miaoyang Wei Zhenghao Guo Kexu Chen Chen Liu Biao Tang Guofu Zhou Guangdong Provincial Key Laboratory of Optical Information Materials and Technology&Institute of Electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China National Center for International Research on Green Optoelectronics South China Normal UniversityGuangzhou 510006China School of Electrical and Electronic Engineering 50 Nanyang AvenueNanyang Technological UniversitySingapore 639798Singapore Shenzhen Guohua Optoelectronics Tech.Co.Ltd Shenzhen 518110China

Microlens arrays(MLAs)based on the selective wetting have opened new avenues for developing compact and miniaturized imaging and display techniques with ultrahigh resolution beyond the traditional bulky and volumetric ***,the selective wetting lenses explored so far have been constrained by the lack of precisely defined pattern for highly controllable wettability contrast,thus limiting the available droplet curvature and numerical aperture,which is a major challenge towards the practical high-performance *** we report a mold-free and self-assembly approach of mass-production of scalable MLAs,which can also have ultrasmooth surface,ultrahigh resolution,and the large tuning range of the *** selective surface modification based on tunable oxygen plasma can facilitate the precise pattern with adjusted chemical contrast,thus creating large-scale microdroplets array with controlled *** numerical aperture of the MLAs can be up to 0.26 and precisely tuned by adjusting the modification intensity or the droplet *** fabricated MLAs have high-quality surface with subnanometer roughness and allow for record-high resolution imaging up to equivalently 10,328 ppi,as we *** study shows a cost-effective roadmap for mass-production of high-performance MLAs,which may find applications in the rapid proliferating integral imaging industry and high-resolution display.

关键词： record pattern precise

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采精期精料补饲水平对牦牛种公牛血清指标和精液品质的影响

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动物营养学报 2024年第7期36卷 4400-4412页

作者：王琦田磊景建武胡广卫李鸿康马万浩牛建章拜彬强刘书杰郝力壮青海大学青海省高原放牧家畜动物营养与饲料科学重点实验室西宁810016 青海省牦牛繁育推广服务中心大通810100

本试验旨在探究采精期不同精料补饲水平对牦牛种公牛生长性能、血清指标和精液品质的影响。试验选取25头体况良好、遗传背景一致、平均体重为(584.48±55.71)kg的牦牛种公牛,随机分为5个组,分别为Ⅰ组(对照组)、Ⅱ组、Ⅲ组、Ⅳ组和Ⅴ组... 详细信息

本试验旨在探究采精期不同精料补饲水平对牦牛种公牛生长性能、血清指标和精液品质的影响。试验选取25头体况良好、遗传背景一致、平均体重为(584.48±55.71)kg的牦牛种公牛,随机分为5个组,分别为Ⅰ组(对照组)、Ⅱ组、Ⅲ组、Ⅳ组和Ⅴ组,每组5头,单栏单饲。5组牦牛每天分别补饲1.00、1.75、2.50、3.25和4.00 kg精料。预试期15 d,正试期45 d。结果表明:1)牦牛种公牛总增重和平均日增重随精料补饲水平的升高呈线性升高(P<0.05)。2)牦牛种公牛血清总蛋白、甘油三酯、低密度脂蛋白胆固醇、尿素含量以及谷丙转氨酶活性含量随精料补饲水平的升高呈线性升高(P<0.05)。与对照组相比,Ⅳ组和Ⅴ组血清总蛋白和尿素含量显著提高(P<0.05),Ⅲ组血清白蛋白含量显著提高(P<0.05),Ⅴ组血清甘油三酯含量和谷丙转氨酶活性显著提高(P<0.05)。3)与对照组相比,Ⅲ组牦牛种公牛血清谷胱甘肽过氧化物酶活性显著提高(P<0.05),Ⅴ组血清丙二醛含量显著提高(P<0.05)。4)与对照组相比,Ⅲ组牦牛种公牛血清白细胞介素-4含量显著提高(P<0.05)。5)牦牛种公牛精子密度和精子前向运动能力随精料补饲水平的升高呈线性升高(P<0.01),其中Ⅲ组、Ⅳ组和Ⅴ组精子密度和精子前向运动能力均极显著高于对照组(P<0.01),Ⅱ组精子密度和精子前向运动能力显著高于对照组(P<0.05)。综上所述,补饲精料会显著改善牦牛种公牛精液品质,但补饲过量会对机体脂肪代谢、肝脏功能、肾脏功能以及机体抗氧化能力造成不利影响;因此,建议采精期牦牛种公牛适宜精料补饲水平为每天2.50 kg。

关键词：牦牛种公牛精料补饲血清指标精液品质

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Anisotropic Fermat’s principle for controlling hyperbolic van der Waals polaritons

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Photonics Research 2022年第10期10卷 I0023-I0031页

作者： SICEN TAO TAO HOU YALI ZENG guangwei hu ZIXUN GE JUNKE LIAO SHAN Zhu TAN ZHANG CHENG-WEI QIU huANYANG CHEN Department of Physics Institute of Electromagnetics and AcousticsCollege of Physical Science and TechnologyXiamen UniversityXiamen 361005China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore

Transformation optics(TO)facilitates flexible designs of spatial modulation of optical materials via coordinate transformations,thus,enabling on-demand manipulations of electromagnetic ***,the application of TO theory in control of hyperbolic waves remains elusive due to the spatial metric signature transition from(+,+)to(−,+)of a two-dimensional hyperbolic ***,we proposed a distinct Pythagorean theorem,which leads to establishing an anisotropic Fermat’s *** helps to construct anisotropic geometries and is a powerful tool for manipulating hyperbolic waves at the nanoscale and *** use of absolute instruments,the excellent collimating and focusing behaviors of naturally in-plane hyperbolic polaritons in van der Waals𝛼α–MoO_(3)layers are demonstrated,which opens up a new way for polaritons manipulation.

关键词： hyperbolic polar Fermat

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Higher moment of coefficients of Dedekind zeta function

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Frontiers of Mathematics in China 2020年第1期15卷 57-67页

作者： guangwei hu Ke WANG School of Mathematics Shandong UniversityJinan 250100China

Let be a non-normal cubic extension over *** study the higher moment of the coefficients aK3(n)of Dedckind zeta function over sum of two squares∑n21+n22≤xa1K3(n21+n22),where 2≤l≤8 and n1,n2,l∈Z.

关键词： Non-normal cubic field Dedekind zeta function

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Special issue on digital and intelligent optics

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Opto-Electronic Science 2023年第11期2卷 1-3页

作者： guangwei hu Junsuk Rho School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Chemical 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

Innovations in artificial intelligence have revolutionized various areas,especially *** rapid development of novel optoelectronic devices at nanoscale has exhibited the multiple functionalities,high integration,compactness,fast modulation and scalability,showcasing new breakthroughs of digital optics and optoelectronic processors for intelligent computations.

关键词： optics breakthrough optoelectronic

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Super-reflector enabled by non-interleaved spin-momentum-multiplexed metasurface

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Light(Science & Applications) 2023年第4期12卷 636-645页

作者： He-Xiu Xu guangwei hu Xianghong Kong Yanzhang Shao Patrice Genevet Cheng-Wei Qiu Air and Missile Defense College Air Force Engineering University710051 Xi'anChina School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore UniversitéCote d'Azur CNRSCentre de Recherche sur l'Hétéro-Epitaxie et ses Applications(CRHEA)06560 ValbonneFrance

Electromagnetic wave multiplexing,especially for that occurring at different incidences(spatial-frequency multiplexing),is pivotal for ultrathin multifunctional interfaces and high-capacity information processing and *** is yet extremely challenging based on passive and compact wave elements,since the wave excitation and scattering channels are exclusively coupled through gradient phases and hence momentum matching condition at the ***,we propose a spin-momentum multiplexed paradigm called a super-reflector enabling on-demand control of both retroreflections and anomalous reflections using a non-interleaved single-celled *** multiplexing four channels connecting two spin states excited onto each input of three spatial frequencies,a total of twelve channels are engineered,among which three are retroreflected channels and the residual are anomalous reflection *** compound multiplexed super-reflector allows five degrees of freedom in circular polarization Jones'matrix,approaching the intrinsic upper limit of such planar *** concept has been experimentally verified by a proof-of-concept super-reflector at microwave frequency,showcasing twelve reflected beams and a high efficiency exceeding 90.6%defined as the ratio of reflected power to incidence for each channel *** strategy opens a new avenue for angle multiplexing and angle-resolved metadevices toward the capacity limit of 2D planar Jones'matrix.

关键词： surface momentum reflected

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