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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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High Crystalline Quality A-Axis Oriented Al0.56Sc0.44N Films for High Coupling Saw Applications

High Crystalline Quality A-Axis Oriented Al0.56Sc0.44N Films...

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International Conference on Solid State Sensors and Actuators (TRANSDUCERS)

作者： Weipeng Xuan Weilun Xie Xiwei Huang Xingli He Zhen Cao Hao Jin Shurong Dong Jikui Luo Ministry of Education Key Lab. of RF Circuits and Systems College of Electron. & Info Hangzhou Dianzi University Hangzhou China School of Electronic and Information Engineering Soochow University Suzhou China Key Lab. of Adv. Micro/Nano Electron. Dev. & Smart Sys. of Zhejiang College of Info. Sci. & Electronic Eng Zhejiang University Hangzhou China International Joint Innovation Center Zhejiang University Haining China

High crystalline quality Al 0.56 Sc 0.44 N $\left( {11\bar 20} \right)$ (a-plane) films were prepared on Al 2 O 3 $\left( {1\bar 102} \right)$ substrates by magnetron reaction sputtering. X-ray diffraction (XRD) analysis indicates that the grown Al 0.56 Sc 0.44 N films are single-phased and a-plane oriented. The full width at half maximum (FWHM) of the rocking curve is only 0.4°, showing the high crystalline quality of the films. Effects of the normalized thickness h AlScN /λ on the acoustic wave propagation properties of the SAW resonator are evaluated by simulations. SAW resonators based on the sputtered non-polar $\left( {11\bar 20} \right)$ Al 0.56 Sc 0.44 N films were prepared, which present a maximum electromechanical coupling coefficient $\left( {k_{eff}^2} \right)$ of 5.7%.

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Reconfigurable Three-Dimensional Thermal Dome

arXiv

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arXiv 2023年

作者： Zhou, Yuhong Yang, Fubao Xu, Liujun Zhuang, Pengfei Wang, Dong Ouyang, Xiaoping Li, Ying Huang, Jiping Fudan University Shanghai200438 China Graduate School of China Academy of Engineering Physics Beijing100193 China School of Materials Science and Engineering Xiangtan University Xiangtan411105 China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou310027 China International Joint Innovation Center Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang The Electromagnetics Academy of Zhejiang University Zhejiang University Haining314400 China

Thermal metamaterial represents a groundbreaking approach to control heat conduction, and, as a crucial component, thermal invisibility is of utmost importance for heat management. Despite the flourishing development of thermal invisibility schemes, they still face two limitations in practical ap plications. First, objects are typically completely enclosed in traditional cloaks, making them difficult to use and unsuitable for objects with heat sources. Second, 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 three-dimensional spaces Here, we propose a concept of a thermal dome to achieve three-dimensional invisibility. Our scheme includes an open functional area, greatly enhancing its usability and applicability. It features a reconfigurable structure, constructed with simple isotropic natural materials, making it suitable for dynamic requirements. The performance of our reconfigurable thermal dome has been confirmed through simulations and experiments, consistent with the theory. The introduction of this concept can greatly advance the development of thermal invisibility technology from theory to engineering and provide inspiration fo other physical domains, such as direct current electric fields and magnetic fields. Copyright © 2023, The Authors. All rights reserved.

关键词： Metamaterials

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SELF-DRIVING TECH FOR NON-CARS From mall shuttles to monster trucks, Perrone Robotics is ready to debut its self-driving tech

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IEEE SPECTRUM 2019年第3期56卷 9-10页

作者： Ross, Philip E. Key Laboratory of Advanced Micro/Nano Electronic Devices and Smart Systems of Zhejiang College of Information Science and Electronic Engineering Zhejiang University Hangzhou China

Like early mammals scuttering between the legs of tyrannosaurs, a lot of little companies are trying to weave around-and maybe even outlast-the big boys of self-driving technology.

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Integrated plasmonic ruler using terahertz multi-BIC metasurface for digital biosensing

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Moore and More 2025年第1期2卷 67-79页

作者： Qun Ren Sheng Jia Jingtong Li Liu He Yan Xu Hao Huang Xiaoman Wang ZherYian Ooi Yongshan Liang Yaoyin Zhang Hang Xu Zhang Zhang Jianwei You Wei E.I.Sha Jianquan Yao School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China Department of Ultrasound Diagnosis and Treatment Tianjin Medical University Cancer Institute and HospitalTianjin 300072China Key Laboratory of Opto-Electronics Information Technology Ministry of EducationSchool of Precision Instruments and Opto-Electronics EngineeringTianjin UniversityTianjin 300072China Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology School of MicroelectronicsTianjin UniversityTianjin 300072China School of Electronic and Information Engineering Changshu Institute of TechnologyJiangsu 215000China State Key Laboratory of Millimeter Waves School of Information Science and EngineeringSoutheast UniversityNanjing 210096China Key Laboratory of Micro-Nano Electronic Devices and Smart Systems of Zhejiang Province College of Information Science and Electronic EngineeringZhejiang UniversityHangzhou 310027China

In recent years,continuous bound states in the continuum(BIC)have gained significant attention for their practical applications in optics,chip technology,and modern *** approaches to realizing and analyzing BIC typi-cally rely on magnetic dipole models,which have limitations in quantitative analysis and *** creates a gap in understanding how to efficiently harness BIC with higher Q-factors for enhanced performance in real-world applications,particularly in scenarios involving terahertz imaging and multi-channel *** this study,we introduce a novel approach using a metallic resonator model that leverages toroidal dipole moments to generate symmetry-protected BIC with high *** systematically varying the asymmetry parameters of the metasurface,we gradually break its symmetry,achieving a transition from the BIC mode to the quasi-BIC mode and facilitating the gradual release of stored electromag-netic *** theoretical analysis confirms the existence and generation of BIC,and experimental measurements of the transmission response spectrum validate these theoretical *** results indicate that terahertz metasurface with high Q-factors can produce strong resonances at specific frequencies,enhancing resistance to electromagnetic interference and ensuring stable imaging quality in complex ***,this study suggests the potential for an integrated plasmonic ruler to achieve high-resolution and efficient biological *** findings bridge the gap by demonstrating how high Q-factor BIC can be effectively utilized for multi-channel terahertz dynamic imaging and biosensing *** advancement lays a new foundation for developing robust systems in multi-channel communication and biomedical sensing,offering significant potential for future technological and medical innovations.

关键词： BIC Metasurface Toroidal dipole moment Anti-electromagnetic interference Plasmonic ruler for biosensing

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Chiral and non-chiral swift mode conversion near an exceptional point with adiabaticity engineering

arXiv

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arXiv 2023年

作者： Wang, Dong Huang, Wen-Xi Zhou, Bo Yu, Wenduo Cao, Pei-Chao Peng, Yu-Gui Zhou, Zheng-Yang Chen, Hongsheng Zhu, Xue-Feng Li, Ying 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 Haining314400 China Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Jinhua Institute Zhejiang University Jinhua321099 China Shaoxing Institute Zhejiang University Shaoxing312000 China School of Physics and Innovation Institute Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of Physics Zhejiang Sci-Tech University Hangzhou310018 China

The eigenvalue of a non-Hermitian Hamiltonian often forms a self-intersecting Riemann surface, leading to a unique mode conversion phenomenon when the Hamiltonian evolves along certain loop paths around an exceptional point (EP). However, two fundamental problems exist with the conventional scheme of EP encircling: the speed of mode conversion is restricted by the adiabatic requirement, and the chirality cannot be freely controlled. Here, we introduce a method which dynamically engineers the adiabaticity in the evolution of non-Hermitian Hamiltonians that allows for both chiral and non-chiral mode conversion on the same path. Our method is based on quantifying and controlling the instantaneous adiabaticity, allowing for non-uniform evolution throughout the entire path. We apply our method into the microwave waveguide system and by optimizing the distributed adiabaticity along the evolution loop, we achieve the same quality of mode conversion as conventional quasi-adiabatic evolution in only one-fourth of the time. Our approach provides a comprehensive and universal solution to address the speed and chirality challenges associated with EP encircling. It also facilitates the dynamic manipulation and regulation of non-adiabatic processes, thereby accelerating the operation and allowing for a selection among various mode conversion patterns. © 2023, CC BY.

关键词： Hamiltonians

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A Valveless Piezoelectric micropump with Flexure Connection Structure

A Valveless Piezoelectric Micropump with Flexure Connection ...

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IEEE Conference on nanotechnology

作者： Jiafeng Ni Weipeng Xuan Yilin Li Xiwei Huang Wenjun Li Hao Jin Shurong Dong Jikui Luo Ministry of Education Key Lab. of RF Circuits and Systems Zhejiang Key Laboratory of Large-Scale Integrated Circuit Design College of Electron. & Info. Hangzhou Dianzi University Hangzhou Key Lab. of Adv. Micro/Nano Electron. Dev. & Smart Sys. of Zhejiang College of Info. Sci. & Electronic Eng. Hangzhou University and International Joint Innovation Center Haining Zhejiang

This work reports a valveless piezoelectric micropump with high pressure load and high flowrate. The experimental results showed that the maximum displacement of the actuator and the output flowrate of the micropump could reach 18.4 μm and 308 mL/min under zero pressure load, respectively, which was highly consistent with the numerical analysis. The maximum output pressure reached 47 kPa, and the pump was extremely stable under various temperatures from room temperature to 80°C, with frequency variations of only −150 Hz. The micropump demonstrated its great potential for wearable/portable application, especially for blood pressure monitoring.

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In-Situ Electrostatic Field Regulating the Recrystallization Behavior of P(Vdf-Trfe) Films with High Β-Phase Content and Enhanced Piezoelectric Properties

SSRN

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SSRN 2022年

作者： Lv, Fu Lin, Jiamin Zhou, Zheng Hong, Zijian Wu, Yongjun Ren, Zhaohui Zhang, Qilong Dong, Shurong Luo, Jikui Shi, Junhui Chen, Ruimin Liu, Bing Su, Yuanjie Huang, Yuhui School of Materials Science and Engineering State Key Laboratory of Silicon Materials Cyrus Tang Center for Sensor Materials and Applications Zhejiang University Zhejiang Hangzhou310027 China School of Materials Science and Engineering State Key Lab of Silicon Materials Zhejiang University Zhejiang Hangzhou310027 China College of Information Science and Electronic Engineering Key Lab of Advanced Micro Nano Electronic Devices & Smart Systems of Zhejiang Zhejiang University Zhejiang Hangzhou310027 China Zhejiang Lab Zhejiang Hangzhou311121 China College of Electronic Information and Engineering Hangzhou Dianzi University Zhejiang Hangzhou310018 China School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Sichuan Chengdu610054 China

Fabrication of flexible piezoelectric polymers is essential for the development of wearable biosensors. Nevertheless, the piezoelectric coefficient of polymers is usually an order of magnitude lower than the inorganic piezoelectric materials, which limits the miniature of the devices. Herein, a simple and cost-effective technique is proposed by applying an electrostatic field to in-situ regulate the recrystallization behavior of the poly(vinylidene fluoride-trifluorethylene) (P(VDF-TrFE)) film during the thermal annealing and recrystallization stage. Significantly enhanced properties are obtained, including a large piezoelectric coefficient (d 33 ~30.7 pC/N) and a high voltage sensitivity of 167.12 mV/kPa. The outstanding performance is mainly attributed to the applied electrostatic field maintained during the film growth stage, which promotes the generation of nucleation sites for the polar β lamellae crystals. A wireless sensor system is further established with the obtained P(VDF-TrFE) film, demonstrating great potential applications in movement monitoring. The proposed facile approach could potentially be applied to the large-scale production of polymer films with excellent piezoelectric properties for flexible wireless biosensing device applications. © 2022, The Authors. All rights reserved.

关键词： Piezoelectricity

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Extended-localized transition in diffusive quasicrystals

arXiv

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arXiv 2022年

作者： Liu, Zhoufei Cao, Pei-Chao Li, Ying Huang, Jiping Fudan University Shanghai200438 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 Key Laboratory of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang The Electromagnetics Academy of Zhejiang University Zhejiang University Haining314400 China Shaoxing Institute of Zhejiang University Zhejiang University Shaoxing312000 China

Compared to 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 the implementation of the extended-localized transition in a diffusive quasicrystal based on the coupled ring chain structure. By modulating the thermal conductivities of 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 the uniform excitation through temperature field simulations. For the localized state, the temperature field clearly demonstrates a multiple localization centers phenomenon, which has no counterpart in wave systems. We also quantitatively investigate the temperature evolution and size effect of this transition. Furthermore, the local excitation has been adopted to demonstrate the temperature field for both the extended and localized states. Besides, we implement the non-Hermitian diffusive AAH model by rotating rings, whose temperature field shows a moving multiple localization centers phenomenon in the localized phase. Finally, we give the experimental suggestions for the diffusive AAH model and propose a potential application named as double-trace distributed generator. Our results can facilitate the design of flexible thermal devices and efficient heat management. © 2022, CC BY.

关键词： Temperature

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Non-Hermitian Dirac cones with valley-dependent lifetimes

arXiv

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arXiv 2024年

作者： Xie, Xinrong Ma, Fei Rui, W.B. Dong, Zhaozhen Du, Yulin Xie, Wentao Zhao, Y.X. Chen, Hongsheng Gao, Fei Xue, Haoran State Key Laboratory of Extreme Photonics and Instrumentation International Joint Innovation Center The Electromagnetics Academy Zhejiang University Zhejiang University Haining314400 China ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou310027 China Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang Jinhua Institute of Zhejiang University Zhejiang University Jinhua321099 China Shaoxing Institute of Zhejiang University Zhejiang University Shaoxing312000 China Department of Physics HKU-UCAS Joint Institute for Theoretical and Computational Physics at Hong Kong The University of Hong Kong Pokfulam Road Hong Kong HK Institute of Quantum Science & Technology The University of Hong Kong Pokfulam Road Hong Kong Department of Physics The Chinese University of Hong Kong Shatin Hong Kong

Relativistic quasiparticles emerging from band degeneracies in crystals play crucial roles in the transport and topological properties of materials and metamaterials. Quasiparticles are commonly described by Hermitian Hamiltonians, with non-Hermiticity usually considered detrimental. In this work, we show that such an assumption of Hermiticity can be lifted to bring quasiparticles into non-Hermitian regime. We propose a concrete lattice model containing two Dirac cones with valley-dependent lifetimes. The lifetime contrast enables an ultra-strong valley selection rule: only one valley can survive in the long-time limit regardless of the excitation, lattice shape and other details. This property leads to an effective parity anomaly with a single Dirac cone and offers a simple way to generate vortex states. Additionally, extending non-Hermitian features to boundaries generates valley kink states with valley-locked lifetimes, making them effectively unidirectional and more resistant against inter-valley scattering. All these phenomena are experimentally demonstrated in a non-Hermitian electric circuit lattice. Copyright © 2024, The Authors. All rights reserved.

关键词： Topology

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