检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Zhou, Shicong Chen, Yipeng Zhu, Xinyu Dong, Shurong Wong, Hei Gao, Zhiliang Wang, Ruojue Wang, Bin Key Laboratory of Micro-nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science & Electronic Engineering Hangzhou310027 China Beijing Smartchip Microelectronics Technology Co. Ltd Shanghai China Department of Electrical Engineering City University of Hong Kong Hong Kong Beijing Orient Institute of Measurement and Test Beijing100094 China

An enhanced diode-triggered silicon-controlled rectifier (EDTSCR) is proposed to meet the requirement of bi-directional electrostatic discharge (ESD) protection for low-voltage Integrated circuits (ICs). Based on the conventional diode-triggered silicon-controlled rectifier (DTSCR), the newly proposed EDTSCR incorporates an additional PMOS and NMOS, respectively, in the N-Well and P-Well to offer additional current paths along the surface which enhances the robustness of the device significantly. TCAD simulation shows that the EDTSCR is still triggered by the diode strings but has a more uniform current distribution for the ON state because of the additional surface current paths. The proposed EDTSCR has excellent dual-directional ESD protection performance with a figure of merit (FOM) of 4.91 mA/um2 which results in about 75% improvement as compared with the conventional DTSCR realized with the same process. EDTSCR also has higher area efficiency, lower trigger voltage, lower current leakage and faster turn-on speed than the DTSCR. The proposed EDTSCR is an attractive ESD protection solution for ultralow voltage ICs. © 2023, The Authors. All rights reserved.

关键词： Diodes

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Enhanced Cherenkov radiation in twisted hyperbolic Van der Waals crystals

arXiv

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arXiv 2024年

作者： Hu, Hao Lin, Xiao Hu, Guangwei Garcia-Vidal, Francisco J. Luo, Yu National Key Laboratory of Microwave Photonics Nanjing University of Aeronautics and Astronautics Nanjing211106 China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hangzhou310027 China International Joint Innovation Center Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang The Electromagnetics Academy Zhejiang University Zhejiang University Haining314400 China School of Electrical and Electronic Engineering Nanyang Technological University 50 Nanyang Avenue Singapore639798 Singapore Universidad Autónoma de Madrid MadridE-28049 Spain

Cherenkov radiation in artificial structures experiencing strong radiation enhancements promises important applications in free-electron quantum emitters, broadband light sources, miniaturized particle detectors, etc. However, the momentum matching condition between the swift electron and emitted photons generally restricts the radiation enhancement to a particular momentum. Efficient Cherenkov radiation over a wide range of momenta is highly demanded for many applications but has still remained a challenging task. To this end, we explore the interaction between a swift electron and twisted hyperbolic Van der Waals crystals, and observe enhanced Cherenkov radiation at the flatband resonance frequency. We show that, at the photonic magic angle of the twisted crystals, the electron momentum, once matching with that of the flatband photon, gives rise to a maximum energy loss (corresponding to the surface phonon generation), one-order of magnitude higher than that in conventional hyperbolic materials. Such a significant enhancement is attributed to the excitation of flatband surface phonon polaritons over a broad momentum range. Our findings provide a feasible route to highly directional free-electron radiation and radiation shaping. Copyright © 2024, The Authors. All rights reserved.

关键词： Van der Waals forces

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An Efficient Neural Network Macro-model for Electromagnetic Radiation Spurious Emission from Voltage-Variable Capacitors

An Efficient Neural Network Macro-model for Electromagnetic ...

引用

IEEE International Symposium on Electromagnetic Compatibility - EMC Europe

作者： Sichen Yang Duo Zhang Chenghan Wu Qiting Lu Yudi Fan Er-Ping Li College of Information Science and Electronic Engineering Key Laboratory of Advanced Micro/Nano Electronic Devices & Smart Systems and Applications Hangzhou China

ISBN: (数字)9781728155791

ISBN: (纸本)9781728155807

Voltage-variable capacitor is an essential part of the matching element in RF circuits such as transmitting and receiving channel in the mobile devices. However, the nonlinearity of the voltage-variable capacitor produces unwanted harmonics with a large exciting signal, which generates the electromagnetic radiation spurious emission (RSE) problem. This paper presents an efficient nonlinear capacitance power series model method coupling with harmonics test systems to predict the nonlinear behavior. In addition, a simple neural network model is trained to reduce manual operation of optimizing the nonlinear parameters. As a consequence, the nonlinear parameters are obtained quickly, and provide the intuitive guideline in designing phase.

关键词： Radio frequency Voltage measurement Capacitors Electromagnetic radiation Harmonic analysis Electromagnetic compatibility Frequency measurement

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Characterizing Ultra-Wideband Scattering from Penetrable Objects Using a Stabilized and Well-Conditioned TDIE with Laguerre Polynomials

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IEEE Transactions on Antennas and Propagation 2025年

作者： Bai, Rongchuan Zhu, Ming-Da Zhang, Haoxuan Du, Zhengwei Chen, Zhe Huang, Li Xie, Hao Leng, Jianxing Yin, Wen-Yan Zhejiang University Innovative Institute of Electromagnetic Information and Electronic Engineering College of Information and Electronic Engineering Hangzhou310058 China Zhejiang University Interdisciplinary Student Training Platform for Marine Areas Hangzhou310027 China Xidian Univer-sity School of Electronic Engineering Shaanxi Xi'an710071 China Purple Mountain Laboratories Nanjing211111 China Zhejiang University Key Laboratory of Advanced Micro Nano Electronic Devices and Smart Systems of Zhejiang Province Innovative Institute of Electromagnetic Information and Electronic Integration College of Infor-mation Science and Electronic Engineering Hangzhou310058 China Hangzhou City University School of Information and Electrical Engi-neering Hangzhou310015 China Zhejiang University Ocean College Zhoushan316021 China

A novel approach is proposed to solve ultra-wideband scattering problem of dielectric objects, which employs the time-domain integral equation (TDIE) method. The frequency band spans from ultra-low frequency (10-25 Hz) to microwave frequency. The application of the Calderón preconditioner ensures that the impedance matrix is well-conditioned. Furthermore, the Filon-type method is integrated into the Calderón pre-conditioner to guarantee the accuracy of the oscillatory integral. In addition, by incorporating a block-matrix constraint condition, we obtain stabilized and well-conditioned dielectric formulations based on marching-on-in-degree (MOD) method. Expanding on these techniques, we propose a universal static error current subtraction (SECS) method, characterized by its simplicity of implementation, to attain an accurate solution for ultra-wideband scenarios. Notably, the accurate results can be obtained from ultra-low to high frequencies through single temporal simulation. Numerical examples demonstrate that the proposed approach is able to achieve stable and accurate ultra-broadband solutions. © 1963-2012 IEEE.

关键词： Ultra-wideband (UWB)

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Observation of temporal topological boundary states of light in a momentum bandgap

arXiv

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arXiv 2024年

作者： Ren, Yudong Ye, Kangpeng Chen, Qiaolu Chen, Fujia Zhang, Li Pan, Yuang Li, Wenhao Li, Xinrui Zhang, Lu Chen, Hongsheng Yang, Yihao State Key Laboratory of Extreme Photonics and Instrumentation ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou310027 China International Joint Innovation Center The Electromagnetics Academy Zhejiang University Zhejiang University Haining314400 China Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Jinhua Institute of Zhejiang University Zhejiang University Jinhua321099 China Shaoxing Institute of Zhejiang University Zhejiang University Shaoxing312000 China

Topological phases have prevailed across diverse disciplines, spanning electronics, photonics, and acoustics. Hitherto, the understanding of these phases has centred on energy (frequency) bandstructures, showcasing topological boundary states at spatial interfaces. Recent strides have uncovered a unique category of bandstructures characterized by gaps in momentum, referred to as momentum bandgaps or k gaps, notably driven by breakthroughs in photonic time crystals1,2. This discovery hints at abundant topological phases defined within momentum bands, alongside a wealth of topological boundary states in the time domain. Here, we report the first experimental observation of k-gap topology in a large-scale optical temporal synthetic lattice, manifesting as temporal topological boundary states. These boundary states are uniquely situated at temporal interfaces between two subsystems with distinct k-gap topology. Counterintuitively, despite the exponential amplification of kgap modes within both subsystems, these topological boundary states exhibit decay in both temporal directions. Our findings mark a significant pathway for delving into k gaps, temporal topological states, and time-varying physics. © 2024, CC BY.

关键词： Momentum

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Observation of scale-free localized states induced by non-Hermitian defects

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Physical Review B 2024年第14期109卷 L140102-L140102页

作者： Xinrong Xie Gan Liang Fei Ma Yulin Du Yiwei Peng Erping Li Hongsheng Chen Linhu Li Fei Gao Haoran Xue State Key Laboratory of Extreme Photonics and Instrumentation ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou 310027 China International Joint Innovation Center The Electromagnetics Academy at Zhejiang University Zhejiang University Haining 314400 China Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Jinhua Institute of Zhejiang University Zhejiang University Jinhua 321099 China Shaoxing Institute of Zhejiang University Zhejiang University Shaoxing 312000 China Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing School of Physics and Astronomy Sun Yat-Sen University (Zhuhai Campus) Zhuhai 519082 China Department of Physics The Chinese University of Hong Kong Shatin Hong Kong SAR China

Wave localization is a fundamental phenomenon that appears universally in both natural materials and artificial structures and plays a crucial role in understanding the various physical properties of a system. Usually, a localized state has an exponential profile with a localization length independent of the system size. Here, we experimentally demonstrate a new class of localized states called scale-free localized states, which has an unfixed localization length scaling linearly with the system size. Using circuit lattices, we observe that a non-Hermitian defect added to a Hermitian lattice induces an extensive number of states with scale-free localization. Furthermore, we demonstrate that, in a lattice with a parity-time-symmetric non-Hermitian defect, the scale-free localization emerges because of spontaneous parity-time symmetry breaking. Our results uncover a type of localized states and extend the study of defect physics to the non-Hermitian regime.

关键词： Crystal defects Localization Metamaterials Non-Hermitian systems PT-symmetry Bethe ansatz Tight-binding model

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Polariton microfluidics for nonreciprocal dragging and reconfigurable shaping of polaritons

arXiv

引用

arXiv 2023年

作者： Cui, Zhenyang Xia, Sihao Shen, Lian Zheng, Bin Chen, Hongsheng Wu, Yingjie ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou310027 China International Joint Innovation Centre Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang The Electromagnetics Academy Zhejiang University Zhejiang University Haining314400 China Jinhua Institute of Zhejiang University Zhejiang University Jinhua321099 China

Dielectric environment engineering is an efficient and general approach to manipulating polaritons. Liquids serving as surrounding media of polaritons have been used to shift polariton dispersions and tailor polariton wavefronts. However, those liquid-based methods have so far been limited to their static states, not fully unleashing the promises offered by the mobility of liquids. Here, we propose a microfluidic strategy for polariton manipulation by merging polaritonics with microfluidics. The diffusion of fluids causes gradient refractive indices over microchannels, which breaks the symmetry of polariton dispersions and realizes the non-reciprocal dragging of polaritons. Based on polariton microfluidics, we also design a set of on-chip polaritonic elements to actively shape polaritons, including planar lenses, off-axis lenses, Janus lenses, bends, and splitters. Our strategy expands the toolkit for the manipulation of polaritons at the subwavelength scale and possesses potential in the fields of polariton biochemistry and molecular sensing. Copyright © 2023, The Authors. All rights reserved.

关键词： Polariton

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Ultrawideband chromatic aberration-free meta-mirrors

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advanced Photonics 2021年第1期3卷 47-56页

作者： Tong Cai Shiwei Tang Bin Zheng Guangming Wang Wenye Ji Chao Qian Zuojia Wang Erping Li Hongsheng Chena Zhejiang University College of Information Science and Electronic EngineeringInterdisciplinary Center for Quantum InformationState Key Laboratory of Modern Optical InstrumentationHangzhouChina Air Force Engineering University Air and Missile Defend CollegeXi’anChina Zhejiang University ZJU-Hangzhou Global Science and Technology Innovation CenterKey Laboratory of Advanced Micro/Nano Electronic Devices and Smart Systems of ZhejiangHangzhouChina Ningbo University Department of PhysicsFaculty of ScienceNingboChina

Chromatic aberration-free meta-devices(e.g.,achromatic meta-devices and abnormal chromatic meta-devices)play an essential role in modern science and ***,current efforts suffer the issues of low efficiency,narrow operating band,and limited wavefront manipulation *** propose a general strategy to design chromatic aberration-free meta-devices with high-efficiency and ultrabroadband properties,which is realized by satisfying the key criteria of desirable phase dispersion and high reflection amplitudes at the target frequency *** phase dispersion is tuned successfully based on a multiresonant Lorentz model,and high reflection is guaranteed by the presence of the metallic *** proof of the concept,two microwave meta-devices are designed,fabricated,and experimentally *** achromatic meta-mirror is proposed within 8 to 12 GHz,and another abnormal chromatic meta-mirror can tune the reflection angle as a linear *** meta-mirrors exhibit very high efficiencies(85%to 94%in the frequency band).Our findings open a door to realize chromatic aberration-free meta-devices with high efficiency and wideband properties and stimulate the realizations of chromatic aberration-free metadevices with other functionalities or working at higher frequency.

关键词： chromatic aberration-free meta-devices ultrabroadband metasurface phase and dispersion control multiresonant Lorentz model

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Plasmon hybridization induced by quasi bound state in the continuum of graphene metasurfaces oriented for high-accuracy polarization-insensitive two-dimensional sensors

引用

Chinese Optics Letters 2022年第4期20卷 65-70页

作者： Xiuyu Wang Jihong Xin Qun Ren Haocheng Cai Jiaqi Han Chengyi Tian Pengcheng Zhang Lijie Jiang Zhihao Lan Jianwei You Wei E.I.Sha Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology School of MicroelectronicsTianjin UniversityTianjin 300072China School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China State Key Laboratory of Millimeter Waves School of Information Science and EngineeringSoutheast UniversityNanjing 210096China Key Laboratory of High Speed Circuit Design and EMC of Ministry of Education School of Electronic EngineeringXidian UniversityXi'an 710071China Huawei Technologies Company Ltd. Shanghai 518129China Department of Electronic and Electrical Engineering University College LondonLondon WC1E7JEUK Key Laboratory of Micro-Nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310027China

Plasmonics could provide compact and powerful solutions for manipulating light in deep-subwavelength dimensions,which is promising for a great range of nanophotonic technologies such as plasmonic rulers and ***,the effective area of enhanced localized field induced by surface plasmon polaritons is typically restricted to the structural *** this work,we propose a method to generate high quality-factor extended electromagnetic fields via hybridizing the superradiant state and the quasi bound state in the continuum of graphene *** coupling interaction involved operates as a three-level system with multiple sharp resonances immune to the polarization,which holds great promise for developing nanodevices with high sensing capacity in two dimensions.

关键词： plasmon hybridization quasi bound state in the continuum high-Q sensing

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Janus faces of dipolar sources in directional near-field coupling with an oriented misalignment

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Physical Review A 2024年第3期109卷 033505-033505页

作者： Chenxu Bian Yuhan Zhong Xuhuinan Chen Tony Low Hongsheng Chen Baile Zhang Xiao Lin State Key Laboratory of Extreme Photonics and Instrumentation ZJU-Hangzhou Global Scientific and Technological Innovation Center College of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China and International Joint Innovation Center The Electromagnetics Academy at Zhejiang University Zhejiang University Haining 314400 China Department of Electrical and Computer Engineering University of Minnesota Minneapolis Minnesota 55455 USA Key Lab of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Jinhua Institute of Zhejiang University Zhejiang University Jinhua 321099 China and Shaoxing Institute of Zhejiang University Zhejiang University Shaoxing 312000 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences and Centre for Disruptive Photonic Technologies Nanyang Technological University Singapore 637371 Singapore

Directional near-field coupling can enable many applications, such as directional routing, on-chip information processing, and chiral quantum optics. This directional near-field coupling is generally face dependent, since the induced near-field radiation pattern is dependent on which face (e.g., the upper or lower face) of the dipolar source is facing toward the outcoupler. In other words, the dipolar sources in the directional near-field coupling intrinsically have two faces (e.g., Janus faces), whose corresponding near-field coupling strength and coupling directionality might be distinct. Here, we outline a general physical framework to control these Janus faces in the directional near-field coupling and find that they can have the feature of an oriented misalignment. To be specific, the upper and lower radiation patterns of excited surface waves can have the same shape but are misaligned with a twist angle. For example, the twist angle can be any acute angle if the source is composed of a Huygens dipole and an electric dipole, and it can be any obtuse angle if the source is constructed by a circular electric dipole and a magnetic dipole.

关键词： Classical optics Light-matter interaction Metamaterials Near-field optics Photonics Plasmonics

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