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arXiv 2018年

作者： He, Zi Gu, Ji Hong Sha, Wei E.I. Chen, Ru Shan Department of Communication Engineering Nanjing University of Science and Technology Nanjing210094 China Key Laboratory of Micro-Nano Electronic Devices Smart Systems of Zhejiang Province College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China

Metallic nanoparticles (NPs) support localized surface plasmon resonances (LSPRs), which enable to concentrate sunlight at the active layer of solar cells. However, full-wave modeling of the plasmonic solar cells faces great challenges in terms of huge computational workload and bad matrix condition. It is tremendously difficult to accurately and efficiently simulate near-field multiple scattering effects from plasmonic NPs embedded into solar cells. In this work, a preconditioned volume integral equation (VIE) is proposed to model plasmonic organic solar cells (OSCs). The diagonal block preconditioner is applied to different material domains of the device structure. As a result, better convergence and higher computing efficiency are achieved. Moreover, the calculation is further accelerated by two-dimensional periodic Green's functions. Using the proposed method, the dependences of optical absorption on the wavelengths and incident angles are investigated. Angular responses of the plasmonic OSCs show the super-Lambertian absorption on the plasmon resonance but near-Lambertian absorption off the plasmon resonance. The volumetric method of moments and explored physical understanding are of great help to investigate the optical responses of OSCs. Copyright © 2018, The Authors. All rights reserved.

关键词： Plasmonics

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Mechanical motion tuned carrier transport characteristic of dynamic diode

arXiv

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arXiv 2023年

作者： Yang, Zunshan Zhong, Huikai Wang, Can Lu, Yanghua Feng, Lixuan Yu, Xutao Liu, Chang Lin, Shisheng College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China Nanchang Hangkong University Nanchang330063 China State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hangzhou310027 China Key Laboratory of Advanced Micro/Nano Electronic Devices & Smart Systems and Applications of Zhejiang Zhejiang University Hangzhou310027 China

Since the invention of dynamic diode, its physical properties and potential applications have attracted wide attentions. A lot of attempts have been made to harvest the rebounding current and voltage of dynamic diode. However, the underlying physical mechanism of its carrier transport characteristic was rarely explored carefully. Here, the electrical transport properties of the dynamic diode are systematically investigated with a mechanical motion tuned method, where the dynamic current-voltage curve shows a gentler growth trend compared to the static curve. The rebounding current increases with motion velocity and contact force, resulting in a reduced current with the same bias voltage and an oscillation current with a changing velocity and force. Besides, we propose a circuit model with an accurate mathematical formula expression to describe the oscillation current, where an imaginary parameter η0 is creatively added to the exponential growth term. This work shows a physical picture of adjust microscopic carrier motion with macroscopic mechanical motion, which provides strong theoretical support for designing dynamic diode devices with better performance in the future. © 2023, CC BY.

关键词： Diodes

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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...

引用

International Applied Computational Electromagnetics Society Symposium (ACES)

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

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.

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Simulating Maxwell-Schrödinger Equations by High-Order Symplectic FDTD Algorithm

arXiv

引用

arXiv 2019年

作者： Xie, Guoda Huang, Zhixiang Fang, Ming Sha, Wei E.I. Key Laboratory of Intelligent Computing and Signal Processing Ministry of Education Anhui University Hefei230601 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

—A novel symplectic algorithm is proposed to solve the Maxwell-Schrödinger (M-S) system for investigating light-matter interaction. Using the fourth-order symplectic integration and fourth-order collocated differences, Maxwell-Schrödinger equations are discretized in temporal and spatial domains, respectively. The symplectic finite-difference time-domain (SFDTD) algorithm is developed for accurate and efficient study of coherent interaction between electromagnetic fields and artificial atoms. Particularly, the Dirichlet boundary condition is adopted for modeling the Rabi oscillation problems under the semi-classical framework. To implement the Dirichlet boundary condition, image theory is introduced, tailored to the high-order collocated differences. For validating the proposed SFDTD algorithm, three-dimensional numerical studies of the population inversion in the Rabi oscillation are presented. Numerical results show that the proposed high-order SFDTD(4,4) algorithm exhibits better numerical performance than the conventional FDTD(2,2) approach at the aspects of accuracy and efficiency for the long-term simulation. The proposed algorithm opens up a promising way towards a high-accurate energy-conservation modeling and simulation of complex dynamics in nanoscale light-matter interaction. Copyright © 2019, The Authors. All rights reserved.

关键词： Finite difference time domain method

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Thermal Willis Coupling in Spatiotemporal Diffusive Metamaterials

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Physical Review Letters 2022年第15期129卷 155901-155901页

作者： Liujun Xu Guoqiang Xu Jiaxin Li Ying Li Jiping Huang Cheng-Wei Qiu Department of Electrical and Computer Engineering National University of Singapore Singapore 117583 Singapore Department of Physics State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures (MOE) Fudan University Shanghai 200438 China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou 310027 China International Joint Innovation Center Key Laboratory of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang The Electromagnetics Academy of Zhejiang University Zhejiang University Haining 314400 China

Willis coupling generically stems from bianisotropy or chirality in wave systems. Nevertheless, those schemes are naturally unavailable in diffusion systems described by a single constitutive relation governed by the Fourier law. Here, we report spatiotemporal diffusive metamaterials by modulating thermal conductivity and mass density in heat transfer. The Fourier law should be modified after homogenizing spatiotemporal parameters, featuring thermal Willis coupling between heat flux and temperature change rate. Thermal Willis coupling drives asymmetric heat diffusion, and the diffusion direction is reversible at a critical point determined by the degree of spatiotemporal modulation. Moreover, thermal Willis coupling stands robustly even when only thermal conductivity is modulated. These results may have potential applications for directional diffusion and offer insights into asymmetric manipulation of nonequilibrium mass and energy transfer.

关键词： Diffusion Heat transfer Metamaterials

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Uncertainty Quantification of Signal Integrity Analysis for Neuromorphic Chips

IEEE Transactions on Signal and Power Integrity

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IEEE Transactions on Signal and Power Integrity 2022年 1卷 160-169页

作者： Hanzhi Ma Da Li Tuomin Tao Xingjian Shangguan En-Xiao Liu Jose Schutt-Aine Andreas C. Cangellaris Er-Ping Li College of Information Science and Electronic Engineering ZJU-UIUC Institute Zhejiang University Hangzhou China Key Lab of Advanced Micro/Nano Electronic Devices and Smart Systems of Zhejiang University Hangzhou China Zhejiang-Singapore Innovation and AI Joint Research Lab China Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign Urbana IL USA A*STAR Institute of High Performance Computing Singapore

A dimensionality reduction based neural network framework is introduced for uncertainty quantification of time-domain response based on system uncertain design parameters for neuromorphic chips. The proposed method firstly makes use of the singular value decomposition (SVD) method to find the basis functions and corresponding coefficients of time-domain response, of which coefficients are used as a lower dimensional target outputs in neural network model compared with time sampling points prediction. This newly proposed method then develops an integrated neural network structure to simultaneously find the mean and variance of target coefficients with a combined definition of loss function, which can be utilized together with basis functions to construct the prediction interval of time-domain response. A memrisor-based crossbar array is applied in this work to verify the performance of the proposed method with the comparison of Monte Carlo method.

关键词： Biological neural networks Uncertainty Memristors Time-domain analysis Integrated circuit modeling Neuromorphics Signal integrity Neural networks Neuromorphics

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Negative refraction of ultra-squeezed in-plane hyperbolic designer polaritons

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Photonics Research 2021年第8期9卷 1540-1549页

作者： QIAOLU CHEN YIHAO YANG LI ZHANG JIALIN CHEN MIN LI XIAO LIN RUJIANG LI ZUOJIA WANG BAILE ZHANG HONGSHENG CHEN Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical InstrumentationZJU-Hangzhou Global Scientific and Technological Innovation CenterZhejiang UniversityHangzhou 310027China International Joint Innovation Center Key Laboratory of Advanced Micro/Nano Electronic Devices&Smart Systems of ZhejiangThe Electromagnetics Academy at Zhejiang UniversityZhejiang UniversityHaining 314400China Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore Centre for Disruptive Photonic Technologies The Photonics InstituteNanyang Technological UniversitySingapore 639798Singapore

The in-plane negative refraction of high-momentum(i.e.,high-k)photonic modes could enable many applications such as imaging,focusing,and waveguiding in a planar platform at deep-subwavelength ***,its practical implementation in experiments remains elusive so *** we propose a class of hyperbolic metasurfaces,which is characterized by an anisotropic magnetic sheet conductivity and can support the in-plane ultrahigh-k magnetic designer *** on such metasurfaces,we report the experimental observation of the all-angle negative refraction of designer polaritons at extremely deep-subwavelength ***,we directly visualize the designer polaritons with hyperbolic ***,for these hyperbolic polaritons,we find that their squeezing factor is *** be specific,it can be up to 129 in the experiments,an ultra-high value exceeding those in naturally hyperbolic *** work may pave a way toward exploring the extremely high confinement and unusual propagation of magnetic designer polaritons over monolayer or twisted bilayer hyperbolic metasurfaces.

关键词： hyperbolic refraction polar

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Observation of spatiotemporal dynamics for topological surface states with on-demand dispersion

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Photonics Research 2024年第12期12卷 2919-2930页

作者： ZHANYUAN ZHANG ZHIHAO LAN PENGBAI XU LEIMING WU MENGLIN L.N.CHEN WEI E.I.SHA YI XU YUWEN QIN Key Laboratory of Photonic Technology for Integrated Sensing and Communication Ministry of EducationInstitute of Advanced Photonic TechnologySchool of Information EngineeringGuangdong University of TechnologyGuangzhou 510006China Department of Electronic and Electrical Engineering University College LondonLondon WC1E7JEUK Guangdong Provincial Key Laboratory of Information Photonics Technology Institute of Advanced Photonic TechnologySchool of Information EngineeringGuangdong University of TechnologyGuangzhou 510006China Department of Electrical and Electronic Engineering The Hong Kong Polytechnic UniversityHong KongChina Key Laboratory of Micro-Nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310027China

Dispersion management in guided wave optics is of vital importance for various *** photonics opens new horizons for manipulating unidirectional guided waves utilizing edge ***,the experimental observation of spatiotemporal dynamics for guided waves with on-demand dispersion in topological photonic crystal is an important issue awaiting ***,we experimentally investigate the spatiotemporal properties of topological surface states with on-demand dispersion,where they are supported by a truncated valley photonic crystal with surface *** observe the electromagnetic dynamics of surface states with typical dispersions,where dynamical trapping of an electromagnetic pulse mediated by the unidirectional surface state with flat dispersion and backward beam routing using reversed dispersion properties are achieved in photonic crystal *** numerical and experimental results substantiate the ultimate dispersion management for topological surface states,which could pave new ways for the manipulation of electromagnetic waves on the surface of photonic devices.

关键词： dispersion surface dynamics

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Emerging chiral optics from chiral interfaces

引用

Physical Review B 2021年第19期103卷 195405-195405页

作者： Xinyan Zhang Yuhan Zhong Tony Low Hongsheng Chen Xiao Lin Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou 310027 China International Joint Innovation Center Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang The Electromagnetics Academy at Zhejiang University Zhejiang University Haining 314400 China Department of Electrical and Computer Engineering University of Minnesota Minneapolis Minnesota 55455 USA

Twisted atomic bilayers are emerging platforms for manipulating chiral light-matter interaction at the extreme nanoscale, due to their inherent magnetoelectric responses induced by the finite twist angle and quantum interlayer coupling between the atomic layers. Recent studies have reported the direct correspondence between twisted atomic bilayers and chiral metasurfaces, which features a chiral surface conductivity, in addition to the electric and magnetic surface conductivities. However, far-field chiral optics in light of these constitutive conductivities remains unexplored. Within the framework of the full Maxwell equations, we find that the chiral surface conductivity can be exploited to realize perfect polarization transformation between linearly polarized light. Remarkably, such an exotic chiral phenomenon can occur either for the reflected or transmitted light. Moreover, we reveal that all transmitted light through the judiciously designed chiral surface conductivity can always have the polarization different from the incident light, irrespective of the incident angle.

关键词： Electromagnetism Extraordinary optical transmission Light-matter interaction Refraction

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Erasable superconductivity in topological insulator Bi2Se3 induced by voltage pulse

arXiv

引用

arXiv 2021年

作者： Le, Tian Ye, Qikai Chen, Chufan Yin, Lichang Zhang, Dongting Wang, Xiaozhi Lu, Xin Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China 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. 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. Here, an emergent superconductivity was observed 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. Copyright © 2021, The Authors. All rights reserved.

关键词： Electric insulators

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