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Reconfigurable Three-Dimensional Thermal Dome

Engineering 2025年第3期46卷 236-244页

作者： Yuhong Zhou Fubao Yang Liujun Xu Pengfei Zhuang Dong Wang Xiaoping Ouyang Ying Li Jiping Huang State Key Laboratory of Surface Physics&Key Laboratory of Micro-and Nano-Photonic Structures(Ministry of Education) Department of PhysicsFudan UniversityShanghai 200438China Graduate School of China Academy of Engineering Physics Beijing 100193China International Joint Innovation Center The Electromagnetics Academy at Zhejiang UniversityZhejiang UniversityHaining 314400China State Key Laboratory of Extreme Photonics and Instrumentation&Key Laboratory of Advanced Micro-Nano Electronic Devices and Smart Systems and Applications of Zhejiang Province Zhejiang UniversityHangzhou 310027China School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105China

Thermal metamaterial represents a groundbreaking approach to control heat conduction,and,as a crucial component,thermal invisibility is of utmost importance for heat *** the flourishing development of thermal invisibility schemes,they still face two limitations in practical ***,objects are typically completely enclosed in traditional cloaks,making them difficult to use and unsuitable for objects with heat ***,although some theoretical proposals have been put forth to change the thermal conductivity of materials to achieve dynamic invisibility,their designs are complex and rigid,making them unsuitable for large-scale use in real threedimensional(3D)***,we propose a concept of a thermal dome to achieve 3D *** scheme includes an open functional area,greatly enhancing its usability and *** features a reconfigurable structure,constructed with simple isotropic natural materials,making it suitable for dynamic *** performance of our reconfigurable thermal dome has been confirmed through simulations and experiments,consistent with the *** introduction of this concept can greatly advance the development of thermal invisibility technology from theory to engineering and provide inspiration for other physical domains,such as direct current electric fields and magnetic fields.

关键词： Thermal domes Reconfigurable metamaterials Three-dimensional invisibility

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Joint Analysis of Frequency-Selective Surfaces at Oblique Incidence in the Frequency, Angular, and Polarization Domains

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IEEE Transactions on Antennas and Propagation 2025年

作者： Xie, Jialong Li, Da Shen, Zhongxiang Li, Er-Ping Zhejiang University Key Laboratory of Advanced Micro/Nano Electronic Devices and Smart Systems and Applications College of Information Science and Electronic Engineering Hangzhou310027 China Beijing Institute of Technology Yangtze Delta Region Academy Zhejiang Jiaxing314019 China

This paper presents a comprehensive analysis of frequency-selective surfaces (FSSs) under oblique incidence, covering the frequency, angular, and polarization domains through their equivalent circuit models (ECM). The FSS structure is modeled as a microwave network, and its normalized impedance characteristics across these domains are systematically derived. The analysis addresses the conditions for perfect transmission, perfect reflection, and transmission bandwidth in the angular domain. To validate the proposed methodology, a dielectric slab.with specifically tailored electrical and physical parameters is studied. Theoretical calculations and numerical simulations demonstrate diverse angular and frequency responses, including single-polarized single-pole filters, single-polarized multi-pole filters, double-polarized single-pole filters, and all-pass filters. Furthermore, detailed procedures for deriving the equivalent circuits and analyzing multilayer slab., air layers, and metal-loaded structures are provided to extend the method’s applicability. A prototype slab.is fabricated, and measured results show excellent agreement with theoretical predictions and numerical simulations, confirming the validity and effectiveness of the proposed approach. © 1963-2012 IEEE.

关键词： All-pass filters

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An Efficient SI/PI Co-optimization and Analysis Method for High-Speed Pin Arrays Design

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IEEE Transactions on Components, Packaging and Manufacturing Technology 2025年

作者： Xu, Ruifeng Li, Da Song, Ruyi Wang, Hongchao Zhang, Ling Li, Er-Ping Zhejiang University College of Information Science and Electronic Engineering Hangzhou310027 China Key Laboratory of Advanced Micro/Nano Electronic Devices and Smart Systems and Applications China Zhejiang Geely Holding Group China

To address the challenges of signal and power integrity in high-density interconnects, this paper presents a novel microwave analysis and intelligent optimization framework for high-speed link pin arrays design. A hybrid modal cascade (HMC) method incorporating the generalized T-matrix approach and the partial element equivalent circuit method is proposed to analyze the signal integrity of multi-layer structure with arbitrary shapes, which facilitates the rapid S-parameters calculation for trace-connected via arrays in advanced package. With the empirical formula of pin mutual inductance, a novel physics-assisted multi-objective genetic algorithm framework, designated as HMC-PMGA, is further introduced to optimize both pin arrangement and array parameters, ensuring compliance with both signal and power integrity requirements. Finally, results from various real-world high-speed link array configurations demonstrate the efficiency and reliability of the proposed algorithm, showing great potential for application in the electromagnetic integrity design of integrated circuits. © 2011-2012 IEEE.

关键词： Design for testability

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Experimental realization of valley vortex states in water wave crystals

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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 controllab.e 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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Accelerating Cross-Scenario Metasurface Adaptability with Plug-and-Play Kernel

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advanced Functional Materials 2025年

作者： Wu, Nanxuan Qian, Chao Wang, Zhedong Zhu, Xiaoyue Xiao, Cheng Li, Erping Chen, Hongsheng ZJU-UIUC Institute Interdisciplinary Center for Quantum Information State Key Laboratory of Extreme Photonics and Instrumentation Zhejiang University Hangzhou310027 China ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Hangzhou310027 China Jinhua Institute of Zhejiang University Zhejiang University Jinhua321099 China Zhejiang Province Key Laboratory of Intelligent Vehicle Electronics Hangzhou Dianzi University Hangzhou310018 China

The adaptivity of metasurfaces depicts an important behavior of dynamically adjusting their internal properties to adapt to changing environments and cater to various demands. In spite of the proliferation of intelligence-driven metasurfaces, they still lack the analogical reasoning to execute cross-scenario tasks due to the random and unpredictable scattering events. Here, a compatible plug-and-play scheme is proposed to assist metasurfaces adapt from one to another environment. Unlike conventional step-by-step training, such a scheme enables the rapid establishment of reliable neural networks with physical interpretability by integrating past experience into a package kernel. Taking the invisibility cloak as a demonstration, a fully intelligent system is set up, and carried out a three-stage adaptability validation: point-to-point, path-to-path, and scene-to-scene, suggesting a substantial speed improvement compared with direct learning. Furthermore, by capitalizing on the resonant metasurfaces, the plug-and-play kernel is successfully extended to broadband performance with a relative bandwidth of 50%. work provides a powerful and easy-to-access recipe for advancing metasurfaces in new and even unknown environments and fosters the shining and bloom of intelligent adaptive meta-devices. © 2025 Wiley-VCH GmbH.

关键词： Computer music

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Photonic antiferromagnetic topological insulator with a single surface Dirac cone

arXiv

引用

arXiv 2025年

作者： Chen, Fujia Han, Ning Pu, Songyang Zhao, Rui Zhang, Li Chen, Qiaolu Hu, Yuze Tong, Mingyu Li, Wenhao Wu, Junyao Ren, Yudong Li, Xinrui Yin, Wenyan Chen, Hongsheng Zhang, Rui-Xing 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 Department of Physics and Astronomy The University of Tennessee KnoxvilleTN37996 United States Department of Materials Science and Engineering The University of Tennessee KnoxvilleTN37996 United States

Antiferromagnetism, characterized by magnetic moments aligned in alternating directions with a vanished ensemble average, has garnered renewed interest for its potential applications in spintronics and axion dynamics. The synergy between antiferromagnetism and topology can lead to the emergence of an exotic topological phase unique to certain magnetic order, termed antiferromagnetic topological insulators (AF TIs). A hallmark signature of AF TIs is the presence of a single surface Dirac cone—a feature typically associated with strong three-dimensional (3D) topological insulators—only on certain symmetry-preserving crystal terminations. However, the direct observation of this phenomenon poses a significant challenge. Here, we have theoretically and experimentally discovered a 3D photonic AF TI hosting a single surface Dirac cone protected by the combined symmetry of time reversal and half-lattice translation. Conceptually, our setup can be viewed as a z-directional stack of two-dimensional Chern insulators, with adjacent layers oppositely magnetised to form a 3D type-A AF configuration. By measuring both bulk and surface states, we have directly observed the symmetry-protected gapless single-Dirac-cone surface state, which shows remarkable robustness against random magnetic disorders. Our work constitutes the first realisation of photonic AF TIs and photonic analogues of strong topological insulators, opening a new chapter for exploring novel topological photonic devices and phenomena that incorporate additional magnetic degrees of freedom. © 2025, CC BY-NC-SA.

关键词： Topological insulators

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

引用

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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Topologically protected edge states in time photonic crystals with chiral symmetry

arXiv

引用

arXiv 2025年

作者： Yang, Yukun Hu, Hao Liu, Liangliang Yang, Yihao Yu, Youxiu Long, Yang Zheng, Xuezhi Luo, Yu Li, Zhuo Garcia-Vidal, Francisco J. National Key Laboratory of Microwave Photonics College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Nanjing211106 China 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 Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore637371 Singapore Department of Electrical Engineering KU Leuven Leuven3001 Belgium Universidad Autónoma de Madrid MadridE-28049 Spain

Time photonic crystals are media in which their electromagnetic parameters are modulated periodically in time, showing promising applications in non-resonant lasers and particle accelerators, among others. Traditionally utilized to study space photonic crystals, topological band theory has also been translated recently to analyze time photonic crystals with time inversion symmetry, enabling the construction of the temporal version of topological edge states. However, temporal disorder can readily break time inversion symmetry in practice, hence likely destroying the edge states associated with this type of time photonic crystals. To overcome this limitation, here we propose a new class of time photonic crystals presenting chiral symmetry instead, whose edge states exhibit superior robustness over the time-reversal-symmetry-protected counterparts. Our time photonic crystal is equivalent to a temporal version of the Su-Schrieffer-Heeger model, and the chiral symmetry of this type of time photonic crystals quantizes the winding number defined in the Bloch frequency band. Remarkably, random temporal disorders do not impact the eigenfrequencies of these chiral-symmetry-protected edge states, while instead enhancing their temporal localizations. Our findings thus provide a promising paradigm to control field amplification with exceptional robustness as well as being a feasible platform to investigate various topological phases in time-varying media. Copyright © 2025, The Authors. All rights reserved.

关键词： Topology

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Temporal Neural Encoding Methods for Spiking Neural Networks 13

Temporal Neural Encoding Methods for Spiking Neural Networks

引用

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

作者： Chen, Quankun Li, Da Tao, Tuomin Ma, Hanzhi Li, Erping Zhejiang University The Zhejiang Key Lab. of Advanced Micro/Nano Electronic Devices Smart Systems and Applications Hangzhou China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

Spike neural networks (SNNs) have gained growing attention, and the temporal encoding methods for the signal input are also crucial. Among these encoding algorithms, a suitable and simple encoding method not only affects the performance of the SNNs but also relates to the expansion in hardware. Several high-performance and easily realized encoding algorithms are discussed in this paper. © 2022 IEEE.

关键词： Network coding

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A Miniaturized Absorber for Radiation Suppression in the Chip Package 7

A Miniaturized Absorber for Radiation Suppression in the Chi...

引用

7th IEEE International Symposium on Electromagnetic Compatibility, ISEMC 2023

作者： Lin, Chaolong Xing, Jiaqi Li, Da Li, Er-Ping Zhejiang University The Zhejiang Key Lab. of Advanced Micro/Nano Electronic Devices Smart Systems and Applications Hangzhou China

ISBN: (纸本)9798350333107

In this page, a miniaturized absorber with ultrawide absorption band is designed and applied for radiation leakage suppression in the chip package. The proposed unit is a double-layer structure with two patterned resistive films of ITO etched on top of the dielectric substrate. The patterned layer is composed of a meandering square ring and a centric circular patch which enhances the coupling within the unit and facilitates the miniaturization of the structure. The size of the unit is 0.08λL× 0.08λL(λL is the wavelength in the free space of the lowest absorption frequency). When the periodic boundary condition is set in the simulation, it shows a broad absorption band (S11-10dB) covering 23.8-40 GHz. This unit is then used as a square ring structure for radiation suppression in chip package which demonstrates a -10dB bandwidth within 25.5-39.5 GHz. © 2023 IEEE.

关键词： Dielectric materials

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