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Extended-localized transition in diffusive quasicrystals

Physical Review Applied 2024年第6期21卷 064035-064035页

作者： Zhoufei Liu Pei-Chao Cao Ying Li Jiping Huang Department of Physics State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) State Key Laboratory of Extreme Photonics and Instrumentation ZJU-Hangzhou Global Scientific and Technological Innovation Center International Joint Innovation Center Key Laboratory of Advanced Micro/Nano Electronic Devices and Smart Systems of Zhejiang The Electromagnetics Academy of Zhejiang University Shaoxing Institute of Zhejiang University

Compared with periodic systems, quasicrystals without translational invariance exhibit unexpected localization properties. The extended-localized transition in quasicrystals has been observed in both quantum and classical wave systems. However, its manifestation in diffusion systems, which serve as novel platforms for exploring phases of matter in condensed-matter physics, remains unexplored. Here we present an implementation of the extended-localized transition in a diffusive quasicrystal based on a coupled-ring chain structure. By modulating the thermal conductivities of the rings, we obtain the diffusive one-dimensional Aubry-André-Harper (AAH) model, which exhibits an extended-localized transition. Thanks to the ring-shaped chain, we clearly demonstrate the extended-localized transition under uniform excitation through temperature-field simulations. For the localized state, the temperature field clearly demonstrates a phenomenon of multiple localization centers, which has no counterpart in wave systems. We also quantitatively investigate the temperature evolution and size effect of this transition. Furthermore, local excitation is used to demonstrate the temperature field for both the extended state and the localized state. Besides, we implement the non-Hermitian diffusive AAH model by rotating the rings, whose temperature field shows a phenomenon of moving multiple localization centers in the localized phase. Finally, we give experimental suggestions for the diffusive AAH model and propose a potential application named the “double-trace distributed generator.” Our results should facilitate the design of flexible thermal devices and efficient heat management.

关键词： Anderson localization Diffusion Heat transfer Skin effect Thermoelectric effects Disordered systems Non-Hermitian systems Quasicrystals

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Design and Analysis of a Novel Miniaturized Ultra-thin Quad-band Metamaterial Absorber 13

Design and Analysis of a Novel Miniaturized Ultra-thin Quad-...

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13th Asia-Pacific International Symposium on Electromagnetic Compatibility and Technical Exhibition, APEMC 2022

作者： Sun, Zhe Yu, Heyuan Lei, Xiaoyong Huo, Shuyun Li, Yan Fang, Lidan Xu, Shaojie Li, Erping Li, Bingheng Hebei University of Technology College of Electronics & Information Engineering Tianjin China China Jiliang University Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province Zhejiang China Zhejiang University Key Laboratory of Advanced Micro-Nano Electronic Devices & Smart Systems and Applications Zhejiang China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

Conventional metamaterial absorber (MMA) are too large to be used in miniaturized devices such as chip systems. To solve this problem, a miniature ultra-thin MMA with four absorption peaks is proposed in this paper. The proposed MMA has a thickness of only 0.2 mm and achieves 99.6%, 97.3%, 99.8% and 99.1% absorption at 12.04 GHz, 17.26 GHz, 21.04 GHz and 23.94 GHz. The paper also analyzes the influence of parameters of the proposed MMA on the absorption performance and proves that it has a certain tunability of the absorption band. By comparing with other MMA work, the MMA proposed in this paper achieves the miniaturization of the structure while ensuring the number of absorption frequency points. This advantage provides a new solution to solve the problem of difficult loading of electromagnetic shielding structures in miniaturized chip architectures. © 2022 IEEE.

关键词： Electromagnetic shielding

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Design and Analysis of a Novel Miniaturized Ultra-Thin Wide-Band Metamaterial Absorber

Design and Analysis of a Novel Miniaturized Ultra-Thin Wide-...

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2023 International Applied Computational Electromagnetics Society Symposium, ACES-China 2023

作者： Ma, Jingnan Li, Yan Li, Erping School of Electronics and Information Engineering Hebei University of Technology Tianjin China China Jiliang University Key Lab. of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province China Zhejiang China Zhejiang University Key Laboratory of Advanced Micro-Nano Electronic Device and Smart Systems and Applications Zhejiang China

ISBN: (纸本)9781733509657

The volume of existing metamaterial absorber (MMA) is not small enough to be applied in miniaturized devices such as chip level. To solve this problem, a miniaturized ultrathin wide-band MMA is proposed in this paper. The thickness of proposed MMA is 1.1mm with a absorption rate of 99.6% at 19.7GHz. This paper also analyzes the influence of parameters of the proposed MMA on the absorption performance and proves that it has a certain tunability of the absorption band. By comparing with other works, the MMA proposed in this paper realizes the miniaturization of the structure while ensuring ultra-wideband. This benefit offers a novel approach to address the problem of difficult loading electromagnetic shielding structures in miniaturized chip designs. © 2023 Applied Computational Electromagnetics Society (ACES).

关键词： Electromagnetic shielding

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Autonomous aeroamphibious invisibility cloak with stochastic-evolution learning

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advanced Photonics 2024年第1期6卷 64-72页

作者： Chao Qian Yuetian Jia Zhedong Wang Jieting Chen Pujing Lin Xiaoyue Zhu Erping Li Hongsheng Chen Zhejiang University ZJU-UIUC InstituteInterdisciplinary Center for Quantum InformationState Key Laboratory of Extreme Photonics and InstrumentationHangzhouChina Zhejiang University ZJU-Hangzhou Global Science and Technology Innovation CenterKey Laboratory of Advanced Micro/Nano Electronic Devices and Smart Systems of ZhejiangHangzhouChina Zhejiang University Jinhua Institute of Zhejiang UniversityJinhuaChina

Being invisible ad libitum has long captivated the popular imagination,particularly in terms of safeguarding modern high-end instruments from potential *** ago,the advent of metamaterials and transformation optics sparked considerable interest in invisibility cloaks,which have been mainly demonstrated in ground and waveguide ***,an omnidirectional flying cloak has not been achieved,primarily due to the challenges associated with dynamic synthesis of metasurface *** demonstrate an autonomous aeroamphibious invisibility cloak that incorporates a suite of perception,decision,and execution modules,capable of maintaining invisibility amidst kaleidoscopic backgrounds and neutralizing external *** physical breakthrough lies in the spatiotemporal modulation imparted on tunable metasurfaces to sculpt the scattering field in both space and frequency *** intelligently control the spatiotemporal metasurfaces,we introduce a stochastic-evolution learning that automatically aligns with the optimal solution through maximum probabilistic *** a fully self-driving experiment,we implement this concept on an unmanned drone and showcase adaptive invisibility in three canonical landscapes-sea,land,and air-with a similarity rate of up to 95%.Our work extends the family of invisibility cloaks to flying modality and inspires other research on material discoveries and homeostatic meta-devices.

关键词： intelligent metasurfaces optical materials and structures deep learning

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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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2023 International Applied Computational Electromagnetics Society Symposium, ACES-China 2023

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

ISBN: (纸本)9781733509657

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. © 2023 Applied Computational Electromagnetics Society (ACES).

关键词： Fabrication

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Analysis of Neural Spike Signal Transmission Characteristics in 3-D Heterogeneous Integration 13

Analysis of Neural Spike Signal Transmission Characteristics...

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13th Asia-Pacific International Symposium on Electromagnetic Compatibility and Technical Exhibition, APEMC 2022

作者： Yu, Heyuan Sun, Zhe Lei, Xiaoyong Huo, Shuyun Li, Yan Fang, Lidan Xu, Shaojie Li, Erping Li, Bingheng Hebei University of Technology College of Electronics & Information Engineering Tianjin China China Ji-Liang University Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province Zhejiang China Zhejiang University Key Laboratory of Advanced Micro-Nano Electronic Devices & Smart Systems and Applications Zhejiang China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

With the continuous development of artificial intelligence, spiking neuromorphic chip is favored for its architectural advantages of memory computing integration. The neural spike signal is used as the transmission signal in the spiking neuromorphic chip, and its completely different characteristics from the digital pulse signal will inevitably lead to different signal integrity problems. In this paper, we model the common Through Silicon Via (TSV) and the interconnection structure model of redistribution layers (RDL) in 3-D heterogeneous integration, analyze the insertion loss and transient impedance of the two structures respectively, and finally perform time-domain transient simulations with neural spike signals of different rising edges in the two models to observe their transmission characteristics. The simulation results show that neural spike signals with shorter rising edges can generate more serious signal integrity problems such as loss, reflection, and delay in the RDL-TSV interconnection structure. © 2022 IEEE.

关键词： Time domain analysis

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A knowledge-inherited learning for intelligent metasurface design and assembly

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Light(Science & applications) 2023年第4期12卷 680-690页

作者： Yuetian Jia Chao Qian Zhixiang Fan Tong Cai Er-Ping Li Hongsheng Chen ZJU-UIUC Institute Interdisciplinary Center for Quantum InformationState Key Laboratory of Extreme Photonics and InstrumentationZhejiang UniversityHangzhou 310027China ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab.of Advanced Micro/Nano Electronic Devices&Smart Systems of ZhejiangZhejiang UniversityHangzhou 310027China Jinhua Institute of Zhejiang University Zhejiang UniversityJinhua 321099China Air and Missile Defense College Air Force Engineering UniversityXi'an 710051China Shaoxing Institute of Zhejiang University zhejiang UniversityShaoxing321000China

Recent breakthroughs in deep learning have ushered in an essential tool for optics and photonics,recurring in various applications of material design,system optimization,and automation *** learning-enabled on-demand metasurface design has been the subject of extensive expansion,as it can alleviate the time-consuming,low-efficiency,and experience-orientated shortcomings in conventional numerical simulations and physics-based ***,collecting samples and training neural networks are fundamentally confined to predefined individual metamaterials and tend to fail for large problem *** by object-oriented C++programming,we propose a knowledge-inherited paradigm for multi-object and shape-unbound metasurface inverse *** inherited neural network carries knowledge from the"parent"metasurface and then is freely assembled to construct the"offspring"metasurface;such a process is as simple as building a container-type *** benchmark the paradigm by the free design of aperiodic and periodic metasurfaces,with accuracies that reach 86.7%.Furthermore,we present an intelligent origami metasurface to facilitate compatible and lightweight satellite communication *** work opens up a new avenue for automatic metasurface design and leverages the assemblability to broaden the adaptability of intelligent metadevices.

关键词： breakthrough consuming shortcomings

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Negative Conductivity Induced Reconfigurable Gain Metasurfaces and Their Nonlinearity

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Physical Review Letters 2024年第11期133卷 113801页

作者： Xiaoyue Zhu Chao Qian Erping Li Hongsheng Chen ZJU-UIUC Institute Interdisciplinary Center for Quantum Information State Key Laboratory of Extreme Photonics and Instrumentation ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Jinhua Institute of Zhejiang University

The past decades have witnessed the rapid development of metamaterials and metasurfaces. However, loss is still a challenging problem limiting numerous practical applications, including long-range wireless communications, superscattering, and non-Hermitian physics. Recently, great effort has been made to minimize the loss, however, they are too complicated for practical implementation and still restricted by the theoretical limit. Here, we propose and experimentally realize a tunable gain metasurface induced by negative conductivity, with deep theoretical analysis from scattering theory and equivalent circuits. In the experiment, we create metasurface samples embedded with tunable negative (or positive) conductivity to achieve adjustable gain (or loss). By varying the control bias voltages, the metasurfaces can reflect incident waves with additional controllable gain. Interestingly, we find the gain metasurfaces inherently pose nonlinearities, which are beneficial for nonlinear optics and microwave applications, particularly for the nonlinear activation of wave-based neural networks.

关键词： Electromagnetic waves & oscillations Gain properties of lasers Metamaterials Metasurfaces Nonlinear optics

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Two-Dimensional Thermal Regulation Based on Non-Hermitian Skin Effect

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Chinese Physics Letters 2023年第10期40卷 83-88页

作者：黄强开来刘云开曹培超祝雪丰李鹰 Interdisciplinary Center for Quantum Information State Key Laboratory of Extreme Photonics and InstrumentationZJU-Hangzhou Global Scientific and Technological Innovation CenterCollege of Information Science&Electronic EngineeringZhejiang UniversityHangzhou 310027China International Joint Innovation Center The Electromagnetics Academy at Zhejiang UniversityZhejiang UniversityHaining 314400China Key Laboratory 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 Physics and Innovation Institute Huazhong University of Science and TechnologyWuhan 430074China

The non-Hermitian skin effect has been applied in multiple ***,there are relatively few models in the field of thermal diffusion that utilize the non-Hermitian skin effect for achieving thermal ***,we propose two non-Hermitian Su-Schrieffer-Heeger(SSH)models for thermal regulation:one capable of achieving edge states,and the other capable of achieving corner states within the thermal *** analyzing the energy band structures and the generalized Brillouin zone,we predict the appearance of the non-Hermitian skin effect in these two ***,we analyze the time-dependent evolution results and assess the robustness of the *** results indicate that the localized thermal effects of the models align with our *** a word,this work presents two models based on the non-Hermitian skin effect for regulating the thermal field,injecting vitality into the design of non-Hermitian thermal diffusion systems.

关键词： Hermitian Skin utilize

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Design of a Double-layer Miniaturized Metamaterial Absorber in 5G Millimeter-wave Band

Design of a Double-layer Miniaturized Metamaterial Absorber ...

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International Conference on microwave and Millimeter Wave Technology Proceedings

作者： Yunxi Wu Yan Li Erping Li Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province China Jiliang University Zhejiang China Key Laboratory of Advanced Micro-Nano Electronic Devices & Smart Systems and Applications Zhejiang University Zhejiang China

A double-layer miniaturized metamaterial absorber based on the indium-tin-oxide (ITO) resistive film in a 5G millimeter-wave band is proposed in this paper. Its core structure is implemented by two layers. The first layer is a glass substrate with ITO resistive film attached, and another ITO is attached to the FR-4 substrate in the second layer. The simulation results reveal that under the conditions of transverse electric or transverse magnetic polarization, the absorption efficiency of the designed structure exceeds 90% in the bandwidth of 23.3GHz ~ 35.2GHz, and reaches the peak of nearly 100% at the resonant point of 28GHz. Further analysis shows that the absorption performance of the incident angle from 0° to 40° can reach more than 90% in the operating frequency, which is relatively stable.

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