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OSA Quantum 2.0 Conference, QUANTUM 2020

作者： Bogdanov, Simeon I. Makarova, Oksana A. Xu, Xiaohui Lagutchev, Alexei S. Shah, Deesha Gabidullin, Aidar R. Ryzhikov, Ilya A. Rodionov, Ilya A. Kildishev, Alexander V. Bozhevolnyi, Sergey I. Boltasseva, Alexandra Shalaev, Vladimir M. Khurgin, Jacob B. School of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States Purdue Quantum Science and Engineering Institute Purdue University West LafayetteIN47907 United States FMN Laboratory Bauman Moscow State Technical University Moscow105005 Russia Moscow127055 Russia Institute for Theoretical and Applied Electromagnetics RAS Moscow125412 Russia Centre for Nano Optics University of Southern Denmark Campusvej 55 Odense MDK-5230 Denmark Johns Hopkins University BaltimoreMD21218 United States

We establish the fundamental limit for quantum emission enhancement in plasmonic nanostructures combining smaller (cavity) and larger (antenna) modes. We confirm this result numerically and optimize the performance of... 详细信息

ISBN: (纸本)9781557528209

关键词： Nanoantennas

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Publisher’s Note: “Evidences of thermoelectrically driven unidirectional magnetoresistance from a single Weyl ferromagnet Co2MnGa” [APL Mater. 11, 121109 (2023)]

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APL Materials 2024年第1期12卷

作者： Bin Rong Lizhu Ren Yizhe Liu Bo Sun Jiaxin Chen Kie Leong Teo Liang Liu Yumeng Yang b) School of Information Science and Technology ShanghaiTech University Shanghai 201210 China Department of Electrical and Computer Engineering National University of Singapore 117576 Singapore Tsinghua-Berkeley Shenzhen Institute Tsinghua University Shenzhen 518055 China Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education) Tsung-Dao Lee Institute School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Hefei National Laboratory Hefei 230088 China Shanghai Research Center for Quantum Sciences 99 Xiupu Road Shanghai 201315 China

This article was published online on December 15, 2023, with errors in the author and affiliation lists; several authors were linked to incorrect affiliations.

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Environmentally stable Er-fiber mode-locked pulse generation and amplification by spectrally filtered and phase-biased nonlinear amplifying long-loop mirror

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High Power Laser science and engineering 2019年第3期7卷 95-101页

作者： Zhengru Guo Qiang Hao Junsong Peng Heping Zeng Shanghai Key Laboratory of Modern Optical System and Engineering Research Center of Optical Instrument and SystemMinistry of EducationSchool of Optical Electrical and Computer EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China

We report on environmentally stable long-cavity ultrashort erbium-doped fiber lasers,which self-start mode-locking at quite low thresholds by using spectrally filtered and phase-biased nonlinear amplifying long-loop *** employing 100-m polarization-maintaining fiber(PMF)in the nonlinear loop,the fundamental repetition rate reaches 1.84 MHz and no practical limitation is found to further decrease the repetition *** filter used in the long loop not only suppresses Kelly sidebands of the solitons,but also eliminates the amplified spontaneous emission which exists widely in lowrepetition-rate ultrafast fiber *** bandwidth of the filter is optimized by using a numerical *** laser emits approximately 3-ps pulses with an energy of 17.4 p J,which is further boosted to 1.5μJ by using a fiber amplifier.

关键词： erbium fibers fiber lasers fiber optics amplifiers and oscillators mode-locked lasers

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Temperature Measurement of Water Vapor by Adaptive Dual Comb Spectroscopy

Temperature Measurement of Water Vapor by Adaptive Dual Comb...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Kangwen Yang Xu Chen Hai Li Dongshuai Hu Ran Huo Qiang Hao Ming Yan Kun Huang Heping Zeng Ministry of Education School of Optical Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai China Chongqing Institute of East China Normal University Chongqing China State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai China

Absorption spectroscopy of water vapor by adaptive dual-comb spectroscopy was demonstrated to measure the temperature at 800 K with a relative deviation of 3.5%, providing a new method for non-invasive combustion diag... 详细信息

ISBN: (数字)9781728143330

ISBN: (纸本)9781728152394

关键词： Temperature measurement Spectroscopy Current measurement Power lasers Measurement by laser beam Lasers and electrooptics Time measurement

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Role of weak interlayer coupling in ultrafast exciton-exciton annihilation in two-dimensional rhenium dichalcogenides

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Physical Review B 2020年第17期101卷 174309-174309页

作者： Sangwan Sim Doeon Lee Jekwan Lee Myungjun Cha Soonyoung Cha Wonhyeok Heo Sungjun Cho Wooyoung Shim Kyusang Lee Jinkyoung Yoo Rohit P. Prasankumar Hyunyong Choi Moon-Ho Jo Division of Electrical Engineering Hanyang University Ansan 15588 Korea Center for Artificial Low Dimensional Electronic Systems Institute for Basic Science (IBS) Pohang 37673 Korea Department of Electrical and Computer Engineering University of Virginia Charlottesville Virginia 22903 USA Department of Physics and Astronomy Institute of Applied Physics Seoul National University Seoul 08826 Korea School of Electrical and Electronic Engineering Yonsei University Seoul 03722 Korea Department of Materials Science and Engineering Yonsei University Seoul 03722 Korea Departments of Materials Science and Engineering University of Virginia Charlottesville Virginia 22903 USA Center for Integrated Nanotechnologies Los Alamos National Laboratory Los Alamos New Mexico 87545 USA Department of Materials Science and Engineering Pohang University of Science and Technology (POSTECH) Pohang 37673 Korea

Strong interactions between excitons are a characteristic feature of two-dimensional (2D) semiconductors, determining important excitonic properties, such as exciton lifetime, coherence, and photon-emission efficiency. Rhenium disulfide (ReS2), a member of the 2D transition-metal dichalcogenide (TMD) family, has recently attracted great attention due to its unique excitons that exhibit excellent polarization selectivity and coherence features. However, an in-depth understanding of exciton-exciton interactions in ReS2 is still lacking. Here we used ultrafast pump-probe spectroscopy to study exciton-exciton interactions in monolayer (1L), bilayer (2L), and triple layer ReS2. We directly measure the rate of exciton-exciton annihilation, a representative Auger-type interaction between excitons. It decreases with increasing layer number, as observed in other 2D TMDs. However, while other TMDs exhibit a sharp weakening of exciton-exciton annihilation between 1L and 2L, such behavior was not observed in ReS2. We attribute this distinct feature in ReS2 to the relatively weak interlayer coupling, which prohibits a substantial change in the electronic structure when the thickness varies. This work not only highlights the unique excitonic properties of ReS2 but also provides novel insight into the thickness dependence of exciton-exciton interactions in 2D systems.

关键词： Excitons Ultrafast phenomena Transition metal dichalcogenides Ultrafast pump-probe spectroscopy

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Affine Non-negative Collaborative Representation Based Pattern Classification

arXiv

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arXiv 2020年

作者： Yin, He-Feng Wu, Xiao-Jun Feng, Zhen-Hua Kittler, Josef School of Artificial Intelligence and Computer Science Jiangnan University Wuxi214122 China Jiangsu Provincial Engineering Laboratory of Pattern Recognition and Computational Intelligence Jiangnan University Wuxi214122 China Department of Computer Science University of Surrey GuildfordGU2 7XH United Kingdom Centre for Vision Speech and Signal Processing University of Surrey GuildfordGU2 7XH United Kingdom

—During the past decade, representation-based classification methods have received considerable attention in pattern recognition. In particular, the recently proposed non-negative representation based classification (NRC) method has been reported to achieve promising results in a wide range of classification tasks. However, NRC has two major drawbacks. First, there is no regularization term in the formulation of NRC, which may result in unstable solution and misclassification. Second, NRC ignores the fact that data usually lies in a union of multiple affine subspaces, rather than linear subspaces in practical applications. To address the above issues, this paper presents an affine non-negative collaborative representation (ANCR) model for pattern classification. To be more specific, ANCR imposes a regularization term on the coding vector. Moreover, ANCR introduces an affine constraint to better represent the data from affine subspaces. The experimental results on several benchmarking datasets demonstrate the merits of the proposed ANCR method. The source code of our ANCR is publicly available at https://***/yinhefeng/ANCR. Copyright © 2020, The Authors. All rights reserved.

关键词： Vectors

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RF-Net: An End-to-End Image Matching Network based on Receptive Field

RF-Net: An End-to-End Image Matching Network based on Recept...

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IEEE/CVF Conference on computer vision and Pattern Recognition

作者： Xuelun Shen Cheng Wang Xin Li Zenglei Yu Jonathan Li Chenglu Wen Ming Cheng Zijian He Fujian Key Laboratory of Sensing and Computing for Smart City School of Information Science and Engineering Xiamen University School of Electrical Engineering and Computer Science Louisiana State University

ISBN: (纸本)9781728132945

This paper proposes a new end-to-end trainable matching network based on receptive field, RF-Net, to compute sparse correspondence between images. Building end-to-end trainable matching framework is desirable and challenging. The very recent approach, LF-Net, successfully embeds the entire feature extraction pipeline into a jointly trainable pipeline, and produces the state-of-the-art matching results. This paper introduces two modifications to the structure of LF-Net. First, we propose to construct receptive feature maps, which lead to more effective key-point detection. Second, we introduce a general loss function term, neighbor mask, to facilitate training patch selection. This results in improved stability in descriptor training. We trained RF-Net on the open dataset HPatches, and compared it with other methods on multiple benchmark datasets. Experiments show that RF-Net outperforms existing state-of-the-art methods.

关键词： Receptive field end-to-end feature map image matching pipeline Dataset

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Dynamic analysis of high-dimensional fractional-order gene regulation networks with time delay

Dynamic analysis of high-dimensional fractional-order gene r...

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Chinese Control Conference (CCC)

作者： Zhe Zhang Can Ding Jing Zhang Feng Liu Yingjie Zhang Fanyong Cheng College of Electrical and Information Engineering Hunan University Changsha China School of Automation China University of Geosciences Wuhan China College of Computer Science and Electronic Engineering Hunan University Changsha China Fujian Provincial Key Laboratory of Information Processing and Intelligent Control Minjiang University Fujian China

ISBN: (数字)9789881563903

ISBN: (纸本)9781728165233

This paper mainly analyzes the stability of high-dimensional fractional-order gene regulatory network systems with time delay. Based on the judgment of eigenvalues, this paper proposes sufficient information about the stability of high-dimensional fractional-order gene regulatory network systems with time delay. Conditions, and by analyzing the characteristic equations, the bifurcation conditions of the high-dimensional fractional-order gene regulatory network system with time delay are derived. Finally, the theoretical part of this paper is verified by numerical simulation.

关键词： Bifurcation Timing Stability analysis Mathematical model Delay effects Numerical stability Electronic mail

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Topology-Dependent Brownian Gyromotion of a Single Skyrmion

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Physical Review Letters 2020年第2期125卷 027206-027206页

作者： Le Zhao Zidong Wang Xichao Zhang Xue Liang Jing Xia Keyu Wu Heng-An Zhou Yiqing Dong Guoqiang Yu Kang L. Wang Xiaoxi Liu Yan Zhou Wanjun Jiang State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084 China Frontier Science Center for Quantum Information Tsinghua University Beijing 100084 China School of Science and Engineering The Chinese University of Hong Kong Shenzhen Guangdong 518172 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Department of Electrical Engineering University of California Los Angeles California 90095 USA Department of Electrical and Computer Engineering Shinshu University 4-17-1 Wakasato Nagano 380-8553 Japan

Noninteracting particles exhibiting Brownian motion have been observed in many occasions of sciences, such as molecules suspended in liquids, optically trapped microbeads, and spin textures in magnetic materials. In particular, a detailed examination of Brownian motion of spin textures is important for designing thermally stable spintronic devices, which motivates the present study. In this Letter, through using temporally and spatially resolved polar magneto-optic Kerr effect microscopy, we have experimentally observed the thermal fluctuation-induced random walk of a single isolated Néel-type magnetic skyrmion in an interfacially asymmetric Ta/CoFeB/TaOx multilayer. An intriguing topology-dependent Brownian gyromotion behavior of skyrmions has been identified. The onset of Brownian gyromotion of a single skyrmion induced by thermal effects, including a nonlinear temperature-dependent diffusion coefficient and topology-dependent gyromotion are further formulated based on the stochastic Thiele equation. The experimental and numerical demonstration of topology-dependent Brownian gyromotion of skyrmions can be useful for understanding the nonequilibrium magnetization dynamics and implementing spintronic devices.

关键词： Micromagnetism Skyrmions

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Role of Eckhaus instability and pattern cracking in ultraslow dynamics of Kerr combs

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Physical Review A 2022年第5期106卷 053518-053518页

作者： Damià Gomila Pedro Parra-Rivas Pere Colet Aurélien Coillet Guoping Lin Thomas Daugey Souleymane Diallo Jean-Marc Merolla Yanne K. Chembo Instituto de Física Interdisciplinar y Sistemas Complejos IFISC (CSIC-UIB) Campus Universitat de les Illes Balears E-07122 Palma de Mallorca Spain Department of Information Engineering Electronics and Telecommunications Sapienza University of Rome Via Eudossiana 18 00184 Rome Italy FEMTO-ST Institute Université Bourgogne Franche-Comté CNRS 15B Avenue des Montboucons 25030 Besançon cedex France Laboratoire Interdisciplinaire Carnot de Bourgogne Université Bourgogne-Franche-Comté CNRS 9 Avenue A. Savary 21078 Dijon France MOE Key Laboratory of Fundamental Quantities Measurement School of Physics Huazhong University of Science and Technology Wuhan 430074 China Department of Electrical and Computer Engineering Institute for Research in Electronics and Applied Physics (IREAP) University of Maryland 8279 Paint Branch Drive College Park Maryland 20742 USA

The Eckhaus instability is a secondary instability of nonlinear spatiotemporal patterns in which high-wave-number periodic solutions become unstable against small-wave-number perturbations. Here we show that this instability can take place in Kerr combs corresponding to subcritical Turing patterns upon changes in the laser detuning. The development of the Eckhaus instability leads to the cracking of patterns and a long-lived transient where the peaks of the pattern rearrange in space due to spatial interactions. In the spectral domain, this results in a metastable Kerr comb dynamics with timescales that can be larger than 1 min. This time is, at least, seven orders of magnitude larger than the intracavity photon lifetime and is in sharp contrast with all the transient behaviors reported so far in cavity nonlinear optics that are typically only a few photon lifetimes long (i.e., in the picosecond to the microsecond range). This phenomenology, studied theoretically in the Lugiato-Lefever model and the observed dynamics is compatible with experimental observations in Kerr combs generated in ultra-high-Q whispering-gallery mode resonators.

关键词： Nonlinear optics Pattern formation Patterns in complex systems Nonlinear waves Chaos & nonlinear dynamics Whispering gallery mode resonators

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