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Performing optical logic operations by a diffractive neural network

Light(Science & Applications) 2020年第1期9卷 1448-1454页

作者： Chao Qian Xiao Lin Xiaobin Lin Jian Xu Yang Sun Erping Li Baile Zhang Hongsheng Chen Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical InstrumentationCollege of Information Science and Electronic EngineeringZhejiang University310027 HangzhouChina ZJU-Hangzhou Global Science and Technology Innovation Center Key Lab.of Advanced Micro/Nano Electronic Devices&Smart Systems of ZhejiangZhejiang University310027 HangzhouChina Department of Electrical Engineering California Institute of TechnologyPasadenaCAUSA ZJU-UIUC Institute Zhejiang University310027 HangzhouChina Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore

Optical logic operations lie at the heart of optical computing,and they enable many applications such as ultrahighspeed information ***,the reported optical logic gates rely heavily on the precise control of input light signals,including their phase difference,polarization,and intensity and the size of the incident *** to the complexity and difficulty in these precise controls,the two output optical logic states may suffer from an inherent instability and a low contrast ratio of ***,the miniaturization of optical logic gates becomes difficult if the extra bulky apparatus for these controls is *** such,it is desirable to get rid of these complicated controls and to achieve full logic functionality in a compact photonic *** a goal remains ***,we introduce a simple yet universal design strategy,capable of using plane waves as the incident signal,to perform optical logic operations via a diffractive neural ***,the incident plane wave is first spatially encoded by a specific logic operation at the input layer and further decoded through the hidden layers,namely,a compound Huygens’*** is,the judiciously designed metasurface scatters the encoded light into one of two small designated areas at the output layer,which provides the information of output logic ***,after training of the diffractive neural network,all seven basic types of optical logic operations can be realized by the same *** a conceptual illustration,three logic operations(NOT,OR,and AND)are experimentally demonstrated at microwave frequencies.

关键词： surface operations precise

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Experimental Realization of an Extreme-Parameter Omnidirectional Cloak

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Research 2019年第1期2019卷 678-685页

作者： Bin Zheng Yihao Yang Zheping Shao Qinghui Yan Nian-Hai Shen Lian Shen Huaping Wang Erping Li Costas MSoukoulis Hongsheng Chen Key Lab.of Advanced Micro/Nano Electronic Devices&Smart Systems of Zhejiang College of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310027China State Key Laboratory of Modern Optical Instrumentation and Te Electromagnetics Academy at Zhejiang University Zhejiang UniversityHangzhou 310027China Department of Physics and Astronomy and Ames Laboratory-U.S.DOE Iowa State University AmesIA 50011USA Institute of Marine Electronics Engineering Zhejiang UniversityHangzhou 310058China Institute of Electronic Structure and Laser FORTH71110 HeraklionCreteGreece

An ideal transformation-based omnidirectional cloak always relies on metamaterials with extreme parameters,which were previously thought to be too difcult 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 frst experimental demonstration of an omnidirectional cloak that satisfes 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 signifcant reduction of scattering feld,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.

关键词： directional extreme realization

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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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Comparative study of Hermitian and non-Hermitian topological dielectric photonic crystals

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Physical Review A 2021年第3期104卷 033501-033501页

作者： Menglin L. N. Chen Li Jun Jiang Shuang Zhang Ran Zhao Zhihao Lan Wei E. I. Sha Key Laboratory of Micro-nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China

The effects of gain and loss on the band structures of a bulk topological dielectric photonic crystal (PC) with C6v symmetry and the PC-air-PC interface are studied based on first-principle calculation. To illustrate the importance of parity-time (PT) symmetry, three systems are considered, namely the PT-symmetric, PT-asymmetric, and lossy systems. We find that the system with gain and loss distributed in a PT symmetric manner exhibits a phase transition from a PT exact phase to a PT broken phase as the strength of the gain and loss increases, while for the PT-asymmetric and lossy systems, no such phase transition occurs. Furthermore, based on the Wilson loop calculation, the topology of the PT-symmetric system in the PT exact phase is demonstrated to keep unchanged as the Hermitian system. At last, different kinds of edge states in Hermitian systems under the influences of gain and loss are studied and we find that while the eigenfrequencies of nontrivial edge states become complex conjugate pairs, they keep real for the trivial defect states.

关键词： Optical & microwave phenomena Photonic crystals Topological effects in photonic systems

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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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A Novel 3-D Frequency Selective Surface With Ultrawide Passband and High Selectivity

A Novel 3-D Frequency Selective Surface With Ultrawide Passb...

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IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)

作者： Xiaodong An Jialong Xie Da Li Yudi Fan Erping Li The Zhejiang Key Laboratory of Advanced Micro/Nano Electronic Devices & Smart Systems and Applications Zhejiang University Hangzhou China

In this paper, a novel 3-dimensional (3-D) frequency selective surface (FSS) structure with ultrawide passband and high selectivity is proposed. Compared to traditional two-dimensional (2-D) wideband structures, (3-D) structures offer enhanced selectivity but exhibit higher insertion loss in the passband. Moreover, three-dimensional structures are often more complex and challenging to manufacture. This paper proposes a simplified three-layer structure. When vertically incident, the FSS exhibits a -3 dB bandwidth of 8-18.4 GHz with a relative bandwidth of 78.7%. Additionally, it forms a stopband with a suppression level exceeding -10 dB within the frequency range of 0-5.2 GHz. In the TE mode, the FSS maintains excellent operational performance within an incident angle range of 0-40 degrees.

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A Miniaturized Absorber for Radiation Suppression in the Chip Package

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

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IEEE International Symposium on Electromagnetic Compatibility (EMC-Beijing)

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

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 $0.08\lambda_{\mathrm{L}}\times 0.08\lambda_{\mathrm{L}}(\lambda_{\mathrm{L}}$ 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 $(\mathrm{S}_{11}\leq-10\text{dB})$ 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.

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Spiral Field Generation in Smith-Purcell Radiation by Helical Metagratings

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Research 2019年第1期2019卷 1115-1122页

作者： Liqiao Jing Zuojia Wang Xiao Lin Bin Zheng Su Xu Lian Shen Yihao Yang Fei Gao Min Chen Hongsheng Chen Key Lab.of Advanced Micro/Nano Electronic Devices&Smart Systems of Zhejiang College of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310027China Department of Physics Massachusetts Institute of TechnologyCambridgeMA 02139USA School of Information Science and Engineering Shandong UniversityQingdao 266237China Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China

Moving electrons interacting with media can give rise to electromagnetic radiations and has been emerged as a promising platform for particle detection,spectroscopies,and free-electron *** this letter,we investigate the Smith-Purcell radiation from helical metagratings,chiral structures similar to deoxyribonucleic acid(DNA),in order to understand the interplay between electrons,photons,and object *** feld patterns can be generated while introducing a gradient azimuthal phase distribution to the induced electric dipole array at the cylindrical *** measurements show efcient control over angular momentum of the radiated feld at microwave regime,utilizing a phased electromagnetic dipole array to mimic moving charged *** angular momentum of the radiated wave is determined solely by the handedness of the helical structure,and it thus serves as a potential candidate for the detection of chiral *** fndings not only pave a way for design of orbital angular momentum free-electron lasers but also provide a platform to study the interplay between swif electrons with chiral objects.

关键词： momentum chiral angular

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Photonic antiferromagnetic topological insulator with a single surface Dirac cone

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Science Advances 2025年第22期11卷

作者： Fujia Chen Ning Han Songyang Pu Rui Zhao Li Zhang Qiaolu Chen Yuze Hu Mingyu Tong Wenhao Li Junyao Wu Yudong Ren Xinrui Li Wenyan Yin Hongsheng Chen Rui-Xing Zhang Yihao Yang 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 Laboratory of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Jinhua Institute of Zhejiang University Zhejiang University Jinhua 321099 China. College of Optical and Electronic Technology China Jiliang University Hangzhou 310018 China. Department of Physics and Astronomy The University of Tennessee Knoxville TN 37996 USA. Department of Materials Science and Engineering The University of Tennessee Knoxville TN 37996 USA.

Antiferromagnetism, characterized by alternating magnetic moments, has garnered renewed interest for its potential applications in spintronics and axion electrodynamics. Its synergy with topology may yield an exotic topological phase unique to a 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 but lacking direct observation. Here, we theoretically and experimentally discover a 3D photonic AF TI protected by the combined symmetry of time reversal and half-lattice translation. By measuring both bulk and surface states, we directly observe the symmetry-protected single-Dirac-cone surface states and their remarkable robustness against random magnetic disorders. To our knowledge, our work constitutes the first realization of photonic AF TIs and photonic analogs of strong 3D topological insulators, opening a chapter for exploring topological photonic devices and phenomena incorporating additional magnetic degrees of freedom.

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A Method for Dealing with Nonlinear Problems in electronic Packaging System

A Method for Dealing with Nonlinear Problems in Electronic P...

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Workshop on Electromagnetic Compatibility of Integrated Circuits (EMC Compo)

作者： Duo Zhang Er-Ping Li Sichen Yang Qiting Lu Yudi Fan The Key Laboratory of Advanced Micro/Nano Electronic Devices & Smart Systems and Applications Zhejiang University Hangzhou China

The nonlinear characteristics of an electronic device appears a strong effect on the system performance at a high frequency and high power. In this paper, we proposed a new approach to model nonlinear capacitors in th... 详细信息

关键词： Capacitors Harmonic analysis Nonlinear systems Integrated circuit modeling Mathematical model Kernel Perturbation methods

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