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

作者： Feifan Deng Xinyu Zhu Fangjun Yu Yipeng Chen Hongyu Shen 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 Huawei Technology Co. Ltd Shanghai China

The failure mode often encountered in System Efficient ESD Design (SEED) is proposed based on a case, that is, the failure caused by the mismatch between the on-board TVS and the ESD Clamp in the chip. The paper prese... 详细信息

ISBN: (数字)9781585373383

ISBN: (纸本)9781665469814

关键词： TV Electrostatic discharges Clamps

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Erasable superconductivity in topological insulator Bi2Se3 induced by voltage pulse

Research Square

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Research Square 2020年

作者： Le, Tian Ye, Qikai Chen, Chufan Yin, Lichang Zhang, Dongting Wang, Xiaozhi Lu, Xin Center for Correlated Matter and Department of Physics Zhejiang University Hangzhou310058 China Key Labaratory of Advanced Micro/Nano Electronic Devices and Smart Systems of Zhejiang College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China Zhejiang Province Key Laboratory of Quantum Technology and Device Zhejiang University Hangzhou310027 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China

Three-dimensional topological insulators (TIs) attract much attention due to its topologically protected Dirac surface states [1, 2, 3, 4]. Doping into TIs or their proximity with normal superconductors can promote the realization of topological superconductivity (SC) and Majorana fermions with potential applications in quantum computations [5, 6, 7, 8, 9, 10, 11]. Here, we observed an emergent superconductivity in local mesoscopic point-contacts on the topological insulator Bi2Se3 by applying a voltage pulse through the contacts, evidenced by the Andreev reflection peak in the point-contact spectra and a visible resistance drop in the four-probe electrical resistance measurements. More intriguingly, the superconductivity can be erased with thermal cycles by warming up to high temperatures (300 K) and induced again by the voltage pulse at the base temperature (1.9 K), suggesting a significance for designing new types of quantum devices. Nematic behaviour is also observed in the superconducting state, similar to the case of CuxBi2Se3 as topological superconductor candidates [12, 13, 14, 15, 16, 11, 17, 18]. © 2020, CC BY.

关键词： Bismuth compounds

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Coupled cavity-waveguide system based on topological corner state and edge state

arXiv

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arXiv 2020年

作者： Shi, Aoqian Yan, Bei Ge, Rui Xie, Jianlan Peng, Yuchen Li, Hang Sha, Wei E.I. Liu, Jianjun Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and Electronics Hunan University Changsha410082 China Key Laboratory of Micro-nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China

Topological corner state (TCS) and topological edge state (TES) have provided new approaches to control the propagation of light. The construction of topological coupled cavity-waveguide system (TCCWS) based on TCS and TES is worth looking forward to, due to its research prospects in realizing high-performance micro-nano integrated photonic devices. In this Letter, TCCWS is proposed in two-dimensional (2D) photonic crystal (PC), which possesses strong optical localization, high quality factor and excellent robustness compared with the conventional coupled cavity-waveguide system (CCCWS). This work will provide the possibility to design high-performance logic gates, lasers, filters and other micro-nano integrated photonics devices and expand their applications. Copyright © 2020, The Authors. All rights reserved.

关键词： Topology

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A Novel Four-Port Calibration Method for High Frequency On-Wafer S-parameter Measurement

A Novel Four-Port Calibration Method for High Frequency On-W...

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International Conference on microwave and Millimeter Wave Technology Proceedings

作者： Jiefeng Zhou Ling Zhang Junhui Chen Da Li Ding Zhou Er-Ping Li College of Information Science and Electronic Engineering and The Zhejiang Key Laboratory of Advanced Micro/Nano Electronic Devices & Smart Systems and Applications Zhejiang University Hangzhou China High-Speed and High-Frequency Lab Huawei Technologies Co. Ltd Dongguan China

This paper proposes a novel four-port calibration method for on-wafer S-parameter measurement. Crosstalk terms can seriously deteriorate the measurement accuracy of high-frequency on-wafer systems. The proposed method can consider all error and crosstalk terms in on-wafer measurement using two ground-signal-signal-ground (GSSG) probes and ensure high calibration accuracy. Only six calibration standards are required to complete the four-port calibration by this method. The proposed method is verified by full-wave simulations up to 100 GHz. The simulation and calibration results are in great agreement, which proves the correctness and reliability of the proposed method.

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Design and Manipulation of Electromagnetic Metasurface Based on Bidirectional Deep Neural Network

Design and Manipulation of Electromagnetic Metasurface Based...

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International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Qun Ren Yongjing Dang Xiaouyue Wu Keck-Voon Ling Wei E. I. Sha Yanwei Pang School of Electrical and Information Engineering Tianjin University Tianjin China Key Laboratory of Micro-Nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science and Electronic Engineering Zhejiang University Hangzhou China

ISBN: (数字)9798350353129

ISBN: (纸本)9798350353136

In the current research field, metasurface technology has attracted much attention because of its excellent electromagnetic wave manipulation ability, and is widely used in the field of micro and nano photonics. In the lower frequency band, the megahertz band, metasurface technology also shows great potential for development, especially in the field of medical imaging, which is becoming increasingly important. However, the design process of metasurfaces is intricate and computationally costly. To tackle this challenge, this paper introduces a deep learning-based approach for the electromagnetic control and design of metasurfaces in the megahertz frequency band. By developing a Deep Neural Network (DNN), we are able to rapidly predict the electromagnetic response of metasurfaces, substantially reducing the time and memory consumption required for simulations. Moreover, the application of deep learning technology in metasurface design extends beyond forward prediction to inverse design, allowing for the prediction of metasurface structures that meet specific electromagnetic response requirements from the design objectives. This method overcomes the limitations of traditional design methods, offering new possibilities for the advancement of metasurface technology.

关键词： Electric potential Design methodology Memory management Electromagnetic scattering Artificial neural networks Predictive models Metasurfaces Electromagnetics Frequency control Photonics

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Experimental Realization of an Extreme-Parameter Omnidirectional Cloak

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研究（英文） 2019年第4期 148-155页

作者： Bin Zheng Yihao Yang Zheping Shao Qinghui Yan Nian-Hai Shen Lian Shen Huaping Wang Erping Li Costas M.Soukoulis Hongsheng Chen Key Lab.of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang College of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China State Key Laboratory of Modern Optical Instrumentation and The Electromagnetics Academy at Zhejiang University Zhejiang University Hangzhou 310027 China Key Lab.of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang College of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China State Key Laboratory of Modern Optical Instrumentation and The Electromagnetics Academy at Zhejiang University Zhejiang University Hangzhou 310027 China Department of Physics and Astronomy and Ames Laboratory-U.S.DOE Iowa State University Ames IA 5001L USA Department of Physics and Astronomy and Ames Laboratory-U.S.DOE Iowa State University Ames IA 5001L USA Institute of Marine Electronics Engineering Zhejiang University Hangzhou 310058 China Key Lab.of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang College of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China Department of Physics and Astronomy and Ames Laboratory-U.S.DOE Iowa State University Ames IA 5001L USA Institute of Electronic Structure and Laser FORTH 71110 Heraklion Crete Greece

An ideal transformation-based omnidirectional cloak always relies on metamaterials with extreme parameters,which were previously thought to be too difficult to *** such a reason,in previous experimental proposals of invisibility cloaks,the extreme parameters requirements are usually abandoned,leading to inherent ***,we report on the first experimental demonstration of an omnidirectional cloak that satisfies the extreme parameters requirement,which can hide objects in a homogenous *** of using resonant metamaterials that usually involve unavoidable absorptive loss,the extreme parameters are achieved using a nonresonant metamaterial comprising arrays of subwavelength metallic channels manufactured with 3D metal printing technology.A high level transmission of electromagnetic wave propagating through the present omnidirectional cloak,as well as significant reduction of scattering field,is demonstrated both numerically and *** work may also inspire experimental realizations of the other full-parameter omnidirectional optical devices such as concentrator,rotators,and optical illusion apparatuses.

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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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Ideal type-Ⅱ Weyl points in topological circuits

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National Science Review 2021年第7期8卷 205-210页

作者： Rujiang Li Bo Lv Huibin Tao Jinhui Shi Yidong Chong Baile Zhang Hongsheng Chen Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation College of Information Science and Electronic Engineering Zhejiang University ZJU-Hangzhou Global Science and Technology Innovation Center Key Laboratory of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Zhejiang University Key Laboratory of In-Fiber Integrated Optics of Ministry of Education College of Physics and Optoelectronic Engineering Harbin Engineering University School of Software Engineering Xi'an Jiaotong University Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Centre for Disruptive Photonic Technologies Nanyang Technological University

Weyl points(WPs), nodal degenerate points in three-dimensional(3 D) momentum space, are said to be‘ideal' if they are symmetry-related and well-separated, and reside at the same energy and far from nontopological bands. Although type-II WPs have unique spectral characteristics compared with type-I counterparts, ideal type-II WPs have not yet been reported because of a lack of an experimental platform with enough flexibility to produce strongly tilted dispersion bands. Here, we experimentally realize a topological circuit that hosts only topological bands with a minimal number of four ideal type-II WPs. By stacking two-dimensional(2 D) layers of inductor-capacitor(LC) resonator dimers with the broken parity inversion symmetry(P), we achieve a strongly tilted band structure with two group velocities in the same direction, and topological surface states in an incomplete bandgap. Our results establish an ideal system for the further study of Weyl physics and other exotic topological phenomena.

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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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Interferenceless Polarization Splitting Through nanoscale van der Waals Heterostructures

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Physical Review Applied 2018年第3期10卷 034025-034025页

作者： Shahnawaz Shah Xiao Lin Lian Shen Maturi Renuka Baile Zhang Hongsheng Chen Key Laboratory of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Zhejiang University Hangzhou 310027 China The Electromagnetics Academy at Zhejiang University College of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China Division of Physics and Applied Physics School of Physical & Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore Centre for Disruptive Photonic Technologies NTU Singapore 637371 Singapore

The ability to control the polarization of light at the extreme nanoscale has long been a major scientific and technological goal for photonics. Here we predict the phenomenon of polarization splitting through van der Waals heterostructures of nanoscale thickness, such as graphene-hexagonal boron nitride heterostructures, at infrared frequencies (near 25.35 THz). The underlying mechanism is that the designed heterostructures possess an effective relative permittivity with its in-plane (out-of-plane) component being unity (zero); such heterostructures are transparent to transverse-electric (TE) waves while opaque to transverse-magnetic (TM) waves, without resorting to the interference effect. Moreover, the predicted phenomenon is insensitive to incident angles. Our work thus indicates that van der Waals heterostructures are a promising nanoscale platform for the manipulation of light, such as the design of polarization beam nanosplitters and ε-near-zero materials, and the exploration of superscattering for TM waves and zero scattering for TE waves from deep-subwavelength nanostructures.

关键词： Metamaterials nanophotonics Polarization of light 2-dimensional systems Graphene Heterostructures Nitrides Van der Waals systems

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