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Experimental realization of valley vortex states in water wave crystals

Science Bulletin 2025年第7期70卷 1034-1037页

作者： Zijian Qin Qiaolu Chen Lian Shen Yihao Yang Hongsheng Chen Huaping Wang Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province Ocean CollegeZhejiang UniversityHangzhou 310058China State Key Laboratory of Extreme Photonics and Instrumentation ZJU-Hangzhou Global Scientific and Technological Innovation CenterZhejiang UniversityHangzhou 310027China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical InstrumentationCollege of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310027China Key Lab of Advanced Micro/Nano Electronic Devices and Smart Systems of Zhejiang Jinhua Institute of Zhejiang UniversityZhejiang UniversityJinhua 321099China Shaoxing Institute of Zhejiang University Zhejiang UniversityShaoxing 312000China International Joint Innovation Center The Electromagnetics Academy at Zhejiang UniversityZhejiang UniversityHaining 314400China

The valley degree of freedom(DoF)plays a crucial role in valleytronics,paralleling the spin DoF in spintronics,and serves as a novel conduit for information and *** momentum space,valley DoF is characterized by discrete energy extremal states,which are present in conventional semiconductors and twodimensional(2D)crystal *** wave behaviors in periodic structures allow for the application of valley dispersion relations to wave systems,including optics[1],acoustics[2,3],and water waves[4].When the wavelength is comparable to the period of an artificial crystal structure,classical waves experience strong Bragg scattering,resulting in a band gap and new propagation *** to their macroscopic features and controllable geometric symmetry,these classical wave systems have become an ideal platform for studying topological *** progress has been made in classical wave systems,conclusive evidence of topological valley states in water waves—a typical classical wave system—has not yet been obtained.

关键词： spin dof valley dispersion relations valley degree freedom dof plays discrete energy extremal stateswhich valley vortex states wave behaviors wave systemsincluding conventional semiconductors

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Higher order BIC of metasurface excited by magnetic EIT

Higher order BIC of metasurface excited by magnetic EIT

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2024 International Applied Computational Electromagnetics Society Symposium, ACES-China 2024

作者： Ren, Qun Wang, Fangmiao Dang, Yongjing Wang, Xiaoman You, Jianwei Wang, Xiuyu Sha, Wei E. I. Tianjin University School of Electrical and Information Engineering Tianjin300072 China Purple Mountain Laboratories Nanjing211100 China Southeast University State Key Laboratory of Millimeter Waves School of Information Science and Engineering Nanjing210096 China Tianjin University Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology School of Microelectronics Tianjin300072 China Zhejiang University Key Laboratory of Micro-Nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science and Electronic Engineering Hangzhou310027 China

ISBN: (纸本)9798350355581

Metasurfaces enable complex modulation of terahertz waves. However, the quality factor of metallic metasurfaces is often limited by intrinsic ohmic losses. The concept of bound states in the continuum (BIC) has been proposed to enhance terahertz-matter interactions. High order BICs have garnered attention due to their robustness. Previous studies on high-order BICs focused on photonic crystals, requiring high structural symmetry. In this paper, we propose a metasurface design based on the magnetic Electromagnetic induced transparency (EIT) effect to excite higher-order BIC eigenmodes. This novel approach and the resulting robust modes hold great potential for terahertz sensing and communication applications. © 2024 IEEE.

关键词： Terahertz waves

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Revealing the Transformation Invariance of Full-Parameter Omnidirectional Invisibility Cloaks

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Electromagnetic Science 2023年第2期1卷 54-60页

作者： Bin Zheng Huan Lu Chao Qian Dexin Ye Yu Luo Hongsheng Chen Interdisciplinary Center for Quantum Information State Key Laboratory of Extreme Photonics and InstrumentationZJUHangzhou Global Scientific and Technological Innovation CenterZhejiang UniversityHangzhou 310027China International Joint Innovation Center The Electromagnetics Academy at Zhejiang UniversityZhejiang UniversityHaining 314400China Key Lab.of Advanced Micro/Nano Electronic Devices&Smart Systems of Zhejiang Jinhua Institute of Zhejiang UniversityZhejiang UniversityJinhua 321099China Shaoxing Institute of Zhejiang University Zhejiang UniversityShaoxing 312000China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore

Searching for an optimal solution among many nonunique answers provided by transformation optics is critical for many branches of research,such as the burgeoning research on invisibility *** past decades have witnessed rapid development of transformation optics,and different kinds of invisibility cloaks have been designed and ***,the available cloaks realized thus far have been mostly demonstrated with reduced parameters,which greatly impact the predefined cloaking ***,we report a general design strategy to realize full-parameter omnidirectional cloaks that can hide arbitrarily shaped objects in free *** approach combines a singular transformation with transformation-invariant *** cloaking device with extreme parameters is implemented using a metallic array *** the experiment,two cloak samples are designed and fabricated,one with nondiscrete cloaking regions and the other with separated hidden ***-unit transmission of electromagnetic waves with arbitrary incident angles is experimentally demonstrated along with significantly suppressed *** work challenges the prevailing paradigms of invisibility cloaks and provides deep insight into how transformation optics could be harnessed to obtain easily-accessible metadevices.

关键词： Transformation optics Invisibility cloaks Full-parameter Omnidirectional

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Breakdown of effective-medium theory by a photonic spin Hall effect

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Science China(Physics,Mechanics & Astronomy) 2023年第11期66卷 145-154页

作者： Shuaijie Yuan Xinxing Zhou Yu Chen Yuhan Zhong Lijuan Sheng Hao Hu Hongsheng Chen Ido Kaminer Xiao Lin Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Synergetic Innovation Center for Quantum Effects and ApplicationsSchool of Physics and ElectronicsHunan Normal UniversityChangsha410081China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong ProvinceInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen518060China Interdisciplinary Center for Quantum Information State Key Laboratory of Extreme Photonics and InstrumentationZJU-Hangzhou Global Scientific and Technological Innovation CenterZhejiang UniversityHangzhou310027China International Joint Innovation Center Electromagnetics Academy at Zhejiang UniversityZhejiang UniversityHaining314400China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore639798Singapore Key Laboratory of Radar Imaging and Microwave Photonics Ministry of EducationCollege of Electronic and Information EngineeringNanjing University of Aeronautics and AstronauticsNanjing211106China Key Laboratory of Advanced Micro/Nano Electronic Devices&Smart Systems of Zhejiang Jinhua Institute of Zhejiang UniversityZhejiang UniversityJinhua321099China Shaoxing Institute of Zhejiang University Zhejiang UniversityShaoxing312000China Department of Electrical Engineering Technion-Israel Institute of TechnologyHaifa32000Israel

Effective-medium theory pertains to the theoretical modelling of homogenization,which aims to replace an inhomogeneous structure of subwavelength-scale constituents with a homogeneous effective *** effective-medium theory is fundamental to various realms,including electromagnetics and material science,since it can largely decrease the complexity in the exploration of light-matter interactions by providing simple acceptable ***,the effective-medium theory is thought to be applicable to any all-dielectric system with deep-subwavelength constituents,under the condition that the effective medium does not have a critical angle,at which the total internal reflection *** we reveal a fundamental breakdown of the effective-medium theory that can be applied in very general conditions:showing it for deep-subwavelength all-dielectric multilayers even without a critical *** finding relies on an exotic photonic spin Hall effect,which is shown to be ultrasensitive to the stacking order of deep-subwavelength dielectric layers,since the spin-orbit interaction of light is dependent on slight phase accumulations during the wave *** results indicate that the photonic spin Hall effect could provide a promising and powerful tool for measuring structural defects for all-dielectric systems even in the extreme nanometer scale.

关键词： photonic spin Hall effect effective-medium theory spin-orbit interaction of light

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热扩散系统中非厄米趋肤效应的观测

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Science Bulletin 2024年第9期69卷 1228-1236页

作者：刘云开曹培超祁铭鸿黄强开来高峰彭玉桂李鹰祝雪丰 School of Physics and Innovation Institute Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Extreme Photonics and Instrumentation ZJU-Hangzhou Global Scientiﬁc and Technological Innovation CenterZhejiang UniversityHangzhou 310027China International Joint Innovation Center The Electromagnetics Academy at Zhejiang UniversityZhejiang UniversityHaining 314400China Key Lab.of Advanced Micro/Nano Electronic Devices&Smart Systems of Zhejiang Jinhua Institute of Zhejiang UniversityZhejiang UniversityJinhua 321099China Shaoxing Institute of Zhejiang University Zhejiang UniversityShaoxing 312000China

The paradigm shift of Hermitian systems into the non-Hermitian regime profoundly modifies inherent property of the topological systems, leading to various unprecedented effects such as the nonHermitian skin effect(NHSE). In the past decade, the NHSE has been demonstrated in quantum, optical and acoustic systems. Beside those wave systems, the NHSE in diffusive systems has not yet been observed, despite recent abundant advances in the study of topological thermal diffusion. In this work,we design a thermal diffusion lattice based on a modified Su-Schrieffer-Heeger model and demonstrate the diffusive NHSE. In the proposed model, the asymmetric temperature field coupling inside each unit cell can be judiciously realized by appropriate configurations of structural parameters. We find that the temperature fields trend to concentrate toward the target boundary which is robust against initial excitation conditions. We thus experimentally demonstrated the NHSE in thermal diffusion and verified its robustness against various defects. Our work provides a platform for exploration of non-Hermitian physics in the diffusive systems, which has important applications in efficient heat collection, highly sensitive thermal sensing and others.

关键词： Non-Hermitian skin effect Asymmetric coupling Thermal metamaterial Heat diffusion

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Chalcogenide Integrated nanophotonics and Its Potential for Quantum Photonics

Chalcogenide Integrated Nanophotonics and Its Potential for ...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Kunhao Lei Kai Xu Kangjian Bao Jiawei Weng Lan Li Hongtao Lin The State Key Lab of Brain-Machine Intelligence Key Laboratory of Micro-Nano Electronics and Smart System of Zhejiang Province College of Information Science and Electronic Engineering Zhejiang University Hangzhou China The Key Laboratory of 3D Micro/ Nano Fabrication and Characterization of Zhejiang Province School of Engineering Westlake University Hangzhou Zhejiang China Institute of Advanced Technology Westlake Institute for Advanced Study Hangzhou Zhejiang China

Due to the high optical nonlinearity and nonvolatile phase-changing properties, chalcogenide integrated nanophotonics are emerging for entangling photon generation and nonvolatile quantum states operation. We will rev... 详细信息

ISBN: (数字)9798350379266

ISBN: (纸本)9798350379273

关键词： Integrated optics Chalcogenides nanophotonics Reviews Optical device fabrication Optical resonators Quantum state Optical network units Optical materials Quantum networks

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Flexible electrical stimulation device with Chitosan-Vaseline®dressing accelerates wound healing in diabetes

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Bioactive Materials 2021年第1期6卷 230-243页

作者： Xiao-Feng Wang Meng-Lu Li Qing-Qing Fang Wan-Yi Zhao Dong Lou Yan-Yan Hu Jun Chen Xiao-Zhi Wang Wei-Qiang Tan Department of Plastic Surgery Sir Run Run Shaw HospitalZhejiang University School of MedicineHangzhou310016Zhejiang ProvincePR China Key Laboratory of Micro-Nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science&Electronic EngineeringZhejiang UniversityHangzhou310027Zhejiang ProvincePR China Innovation Center for Signaling Network College of Life SciencesZhejiang UniversityHangzhou310058Zhejiang ProvincePR China

The healing process of diabetic wounds is typically disordered and prolonged and requires both angiogenesis and *** of the endogenous electric fields(EFs)may lead to disordered cell *** stimulation(ES)that mimics endogenous EFs is a promising method in treating diabetic wounds;however,a microenvironment that facilitates cell migration and a convenient means that can be used to apply ES are also ***-Vaseline■gauze(CVG)has been identified to facilitate wound healing;it also promotes moisture retention and immune regulation and has antibacterial *** this study,we created a wound dressing using CVG together with a flexible ES device and further evaluated its potential as a treatment for diabetic *** found that high voltage monophasic pulsed current(HVMPC)promoted healing of diabetic wounds in *** studies carried out in vitro,we found that HVMPC promoted the proliferation and migration of human umbilical vein endothelial cells(HUVECs)by activating PI3K/Akt and ERK1/2 ***,we determined that the flexible ES-chitosan dressing may promoted healing of diabetic wounds by accelerating angiogenesis,enhancing epithelialization,and inhibiting scar *** findings provide support for the ongoing development of this multidisciplinary product for the care and treatment of diabetic wounds.

关键词： Diabetic wounds Flexible electronic device Electrical stimulation Chitosan-vaseline■gauze Wound healing

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Predicting the ESD window of GGNMOS using neural network

Predicting the ESD window of GGNMOS using neural network

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Design and System (IEDS), International EOS/ESD Symposium on

作者： Xinyu Zhu Fangjun Yu Feifan Deng Yipeng Chen Shurong Dong Key Laboratory of Micro-nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science & Electronic Engineering Zhejiang University Hangzhou China

Neural network modeling method for predicting the electro-static discharge (ESD) window of Gate-Grounded NMOS (GGNMOS) is introduced in this work. Compared with TCAD simulation, the time consumption is reduced by 6 or... 详细信息

ISBN: (数字)9781585373383

ISBN: (纸本)9781665469814

关键词： Neural networks Predictive models Logic gates Electrostatic discharges Discharges (electric) MOS devices

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Fabrication-Constrained Conjugate Adjoint Gradient Inverse Design for Large-Scale Aperiodic Frequency Selective Surface

Fabrication-Constrained Conjugate Adjoint Gradient Inverse D...

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International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Enze Zhu Erji Li Zhun Wei Wen-Yan Yin Qian Wang Key Lab of Advanced Micro/Nano Electronic Devices and Smart Systems of Zhejiang Province Innovative Institute of Electromagnetic Information and Electronic Integration Zhejiang University Hangzhou China Aeronautical Science Key Lab for High Performance Electromagnetic Windows AVIC Research Institute for Special Structures of Aeronautical Composites Jinan China

In this paper, a fabrication-constrained conjugate adjoint gradient inverse design method (FCAG-IDM) is proposed to optimize the structural parameters of large-scale aperiodic frequency selective surfaces (FSSs). A characteristic of the proposed FCAG-IDM is that it constrains the optimized variables in each iteration considering the fabrication precision. The main advantage of FCAG-IDM is to achieve a fast inverse design for the scattering performance of electrically large-scale structure by combining fast forward simulator, conjugate adjoint gradient descent, and fabrication-constraint. The proposed FCAG-IDM is validated by both numerical and experimental results.

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Novel Ring Silicon-Controlled Rectifier for ESD Protection of Low-Voltage Circuits

Novel Ring Silicon-Controlled Rectifier for ESD Protection o...

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Design and System (IEDS), International EOS/ESD Symposium on

作者： Fangjun Yu Xinyu Zhu Feifan Deng Yipeng Chen Shurong Dong Key Laboratory of Micro-nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science & Electronic Engineering Zhejiang University Hangzhou China

ISBN: (数字)9781585373383

ISBN: (纸本)9781665469814

In this paper, a novel ring silicon-controlled rectifier (NRSCR) for electrostatic discharge (ESD) protection is proposed. Compared with conventional SCR, the trigger voltage of NRSCR is reduced by 3.2V, and the robustness is about twice that of conventional diode and SCR, which is suitable for ESD protection of low-voltage circuits.

关键词： Electrostatic discharge protection Low voltage Current measurement Rectifiers Implants CMOS process Robustness

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