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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Ji, Qing-Xin Jin, Warren Wu, Lue Yu, Yan Yuan, Zhiquan Zhang, Wei Gao, Maodong Li, Bohan Wang, Heming Xiang, Chao Guo, Joel Feshali, Avi Paniccia, Mario Ilchenko, Vladimir Matsko, Andrey Bowers, John Vahala, Kerry T J. Watson Laboratory of Applied Physics California Institute of Technology PasadenaCA91125 United States Department of Electrical and Computer Engineering University of California Santa Barbara Santa BarbaraCA93106 United States Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive PasadenaCA91109-8099 United States Anello Photonics Santa ClaraCA United States

The wavelength of zero group-velocity-dispersion is engineered in a silicon-nitride coupled-ring resonator. The resonator is hybridly-integrated with a semiconductor laser pump to produce high-power-efficiency microco... 详细信息

ISBN: (纸本)9781957171258

关键词： Group velocity dispersion

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TPOPT: EFFICIENT TRAINABLE TEMPLATE OPTIMIZATION ON LOW-DIMENSIONAL MANIFOLDS

arXiv

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arXiv 2023年

作者： Yan, Jingkai Wang, Shiyu Wei, Xinyu Rain Wang, Jimmy Márka, Zsuzsanna Márka, Szabolcs Wright, John Department of Electrical Engineering Columbia University United States Department of Computer Science Columbia University United States Department of Physics Columbia University United States Data Science Institute Columbia University United States Columbia Astrophysics Laboratory Columbia University United States Department of Applied Physics and Applied Mathematics Columbia University United States Department of Mathematics Columbia University United States

In scientific and engineering scenarios, a recurring task is the detection of low-dimensional families of signals or patterns. A classic family of approaches, exemplified by template matching, aims to cover the search space with a dense template bank. While simple and highly interpretable, it suffers from poor computational efficiency due to unfavorable scaling in the signal space dimensionality. In this work, we study TpopT (TemPlate OPTimization) as an alternative scalable framework for detecting low-dimensional families of signals which maintains high interpretability. We provide a theoretical analysis of the convergence of Riemannian gradient descent for TpopT, and prove that it has a superior dimension scaling to covering. We also propose a practical TpopT framework for nonparametric signal sets, which incorporates techniques of embedding and kernel interpolation, and is further configurable into a trainable network architecture by unrolled optimization. The proposed trainable TpopT exhibits significantly improved efficiency-accuracy tradeoffs for gravitational wave detection, where matched filtering is currently a method of choice. We further illustrate the general applicability of this approach with experiments on handwritten digit data. Copyright © 2023, The Authors. All rights reserved.

关键词： Optimization

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Field-controlled dynamics of skyrmions and monopoles

arXiv

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arXiv 2023年

作者： Tai, Jung-Shen B. Hess, Andrew J. Wu, Jin-Sheng Smalyukh, Ivan I. Department of Physics Chemical Physics Program University of Colorado BoulderCO80309 United States Department of Electrical Computer and Energy Engineering Materials Science and Engineering Program Soft Materials Research Center University of Colorado BoulderCO80309 United States Renewable and Sustainable Energy Institute National Renewable Energy Laboratory University of Colorado BoulderCO80309 United States

Magnetic monopoles, despite their ongoing experimental search as elementary particles, have inspired the discovery of analogous excitations in condensed matter systems. In chiral condensed matter systems, emergent monopoles are responsible for the onset of transitions between topologically distinct states and phases, like in the case of transitions from helical and conical phase to A-phase comprising periodic arrays of skyrmions. By combining numerical modeling and optical characterizations, we describe how different geometrical configurations of skyrmions terminating at monopoles can be realized in liquid crystals and liquid crystal ferromagnets. We demonstrate how such complex structures can be effectively manipulated by external magnetic and electric fields. Furthermore, we discuss how our findings may hint at similar dynamics in other physical systems, and their potential applications. © 2023, CC BY.

关键词： Liquid crystals

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Multi-wavelength edge detection based on nonlocal multilayer GaAs-AlAs thin films

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Optics letters 2025年第12期50卷 3856-3859页

作者： Sina Mohammadi Matthew Markowitz Francesco Monticone Mohammad Ali Miri Maria Tamargo Ph.D. Program in Physics The Graduate Center of the City University of New York New York New York 10016 USA Department of Physics Queens College of the City University of New York Queens New York 11367 USA School of Electrical and Computer Engineering Cornell University Ithaca New York 14853 USA Department of Chemistry The City College of New York New York New York 10031 USA

We demonstrate a compact multilayer GaAs-AlAs structure for passive optical edge detection at multiple wavelengths. Through the inverse design of the layer thicknesses, this structure manipulates spatial frequency components of an incoming wavefront, selectively reflecting high-frequency features while suppressing low-frequency intensity variations. Simulations reveal a reflectance transition from minimal to near-total as a function of numerical aperture, a property leveraged for enhancing edge contrast in optical imaging. For the first time, to our knowledge, we utilize molecular beam epitaxy (MBE) to fabricate edge detection devices, ensuring structural fidelity. Material characterization confirms high-quality interfaces, precise thickness control, and excellent uniformity, validating the suitability of MBE for this application. Experimental angle-resolved reflectance measurements closely align with theoretical predictions, demonstrating the feasibility of this approach for real-time, hardware-based optical image processing. The proposed design automatically works for at least two wavelengths and can be readily extended to operate at multiple wavelengths simultaneously. This work opens new possibilities for employing multilayer interference structures in high-performance optical imaging and real-time signal processing.

关键词： Digital image processing Edge detection Inverse design Optical imaging Signal processing Thin films

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Recent Advancements in Nanophotonics for Optofluidics

arXiv

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arXiv 2024年

作者： Yang, Sen Hong, Chuchuan Zhu, Guodong Anyika, Theodore Hong, Ikjun Ndukaife, Justus C. Institute of Physics Chinese Academy of Sciences Beijing National Laboratory for Condensed Matter Physics Beijing100190 China Department of Chemistry Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States Department of Electrical and Computer Engineering Vanderbilt University NashvilleTN37235 United States Department of Mechanical Engineering Vanderbilt University NashvilleTN37235 United States Interdisciplinary Materials Science Program Vanderbilt University NashvilleTN37240 United States

Optofluidics is dedicated to achieving integrated control of particle and fluid motion, particularly on the micrometer scale, by utilizing light to direct fluid flow and particle motion. The field has seen significant growth recently, driven by the concerted efforts of researchers across various scientific disciplines, notably for its successful applications in biomedical science. In this review, we explore a range of optofluidic architectures developed over the past decade, with a primary focus on mechanisms for precise control of micro and nanoscale biological objects and their applications in sensing. Regarding nanoparticle manipulation, we delve into mechanisms based on optical nanotweezers using nanolocalized light fields and light-based hybrid effects with dramatically improved performance and capabilities. In the context of sensing, we emphasize those works that used optofluidics to aggregate molecules or particles to promote sensing and detection. Additionally, we highlight emerging research directions, encompassing both fundamental principles and practical applications in the field. Copyright © 2024, The Authors. All rights reserved.

关键词： Flow of fluids

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Efficient pumping of atomic frequency combs in a Tm3+:YAG crystal for broadband quantum optical storage

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Physical Review applied 2025年第5期23卷 054076-054076页

作者： Yisheng Lei Zongfeng Li Mahdi Hosseini Department of Electrical and Computer Engineering and Applied Physics Program Northwestern University Evanston Illinois 60208 USA Elmore Family School of Electrical and Computer Engineering Purdue University West Lafayette Indiana 47907 USA

Quantum memory devices with high storage efficiency and bandwidth are essential elements for future quantum networks. Here, we report a storage efficiency greater than 28% in a Tm3+:YAG crystal (where YAG is yttrium aluminum garnet) at elevated temperatures, achieving this milestone without relying on optical cavities and without compromising memory bandwidth. We introduce different pumping techniques for Tm-based memories that enable multifrequency-window storage and high memory bandwidth reaching 630 MHz, significantly surpassing previous Tm-based memory demonstrations, considering the operating temperature of 3.5 K. Furthermore, we propose a general method for large-bandwidth atomic frequency memory using non-Kramers rare-earth ions (REIs) in solids, paving the way for storage efficiencies and bandwidths approaching fundamental limits. The compatibility of Tm memories with neutral-atom quantum processors and their seamless integration with scalable photonic platforms, such as lithium niobate on insulator, underscore their potential for distributed quantum computing, hybrid quantum networks, and space-based quantum communication. Our study represents a significant advancement toward practical high-performance quantum memories based on REI-doped crystals, where we predict that gigahertz bandwidth and storage efficiencies exceeding 30% are achievable at lower temperatures.

关键词： Qubits

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Bamboo-Inspired Metamaterials Design: Microstructure Dielectrophoretic Orientation for Enhancing Insulation Performance of Advanced Power Modules

SSRN

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SSRN 2024年

作者： Yao, Huanmin Mu, Haibao Shen, Maoqun Cavallini, Andrea Li, He Zhao, Haoxiang Li, Wendong Zhang, Daning Zhang, Guanjun State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Shaanxi 710049 China The Department of Electrical Electronic and Information Engineering "Guglielmo Marconi" University of Bologna Italy Department of Mathematics and Computer Science Eindhoven University of Technology Eindhoven5600MB Netherlands Department of Applied Physics Eindhoven University of Technology Eindhoven5600MB Netherlands

The application of nonlinear conductivity coatings in high-voltage power module is a promising strategy for significantly improving electrical insulation performance. The core of the improvement principle is that the nonlinear conductivity realizes a dynamic optimization of the discharge risk inside the material. The realization of this nonlinear conductivity requires sufficient microscopic arrangement of fillers that align with the macroscopic insulation structure. However, conventional methods fail at precise arrangement control so that typically require high filler concentration, which markedly increases dielectric loss and leakage current. Drawing inspiration from the bamboo structure, metamaterials offer an efficient tuning of nonlinear characteristics with lower filler concentrations through thoughtful design. In this context, we introduce a novel approach to fabricate SiC whisker / silicon elastomer metamaterial coatings leveraging the dielectrophoretic effect. Comprehensive testing of the physical and chemical properties of the composites confirmed the successful preparation of the material. And the metamaterial exhibits excellent nonlinear conductivity and low dielectric loss across various temperatures. Notably, after applying the metamaterial coating, the maximum electric field stress within the power module was reduced by nearly ten times, and the partial discharge inception voltage (PDIV) increased by 58.9%, 74.7%, and 32.8% at 30°C, 60°C, and 90°C, respectively. From solid physical mechanism to exquisite material design and practical device-level implementation, this study offers valuable insights into enhancing the insulation performance of power module and demonstrates substantial potential for further industrial applications. © 2024, The Authors. All rights reserved.

关键词： Dielectric losses

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Optical Teleportation using Electro-Optic Plasmonic Graphene Waveguide

Optical Teleportation using Electro-Optic Plasmonic Graphene...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Montasir Qasymeh Muhammad Asjad Hichem Eleuch Electrical and Computer Engineering Department Abu Dhabi University UAE Department of Applied Physics and Astronomy University of Sharjah Sharjah UAE Institute for Quantum Science and Engineering Texas AM University Texas USA

We demonstrate that optical teleportation can be realized by using two interacting optical fields in an electrically driven graphene waveguide. The simulations show that the proposed system can achieve high-fidelity t... 详细信息

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Optical losses Graphene Waveguide lasers Teleportation Plasmons Optical pumping Optical coupling

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Experimental implementation of chaos-based video encryption using visible light communication technology

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applied Optics 2025年第9期64卷 C101-C118页

作者： Fotso, Sorel Bagio Nono Mbé, Jimmi Hervé Talla Takotue, Jean Ernest Takougang, Armand Cyrille Nzeukou Ndjiongue, Alain Richard Research Unit of Condensed Matter Electronics and Signal Processing Department of Physics University of Dschang P.O. Box 67 Dschang Cameroon Research Unit of Automation and Applied Computer Department of Electrical Engineering IUT-FV Bandjoun University of Dschang P.O. Box: 134 Bandjoun Cameroon Laboratory of Industrial Systems and Environmental Engineering Fotso Victor University Institute of Technology University of Dschang P.O. Box 134 Bandjoun Cameroon School of Electrical and Information Engineering Faculty of Engineering and the Built Environment University of the Witwatersrand Johannesburg South Africa

Simulations are commonly used to develop and evaluate video encryption algorithms. Although these approaches are useful for demonstrating theoretical feasibility and algorithm performance, they neglect practical challenges and real-world communication conditions. This oversight creates a critical gap in evaluating their effectiveness and security in practical applications. In this paper, we describe a novel, to the best of our knowledge, video encryption scheme that employs a modified chaotic Colpitts oscillator, a customized Josephus problem, and ribonucleic acid (RNA) operations, and is implemented in visible light communication (VLC) environment. The modified Colpitts oscillator reveals significant phenomena, the most prominent for this study being chaos. The encryption scheme involves block scrambling and pixel-level permutation employing a customized Josephus problem and a column and row shifting technique. Diffusion is then achieved through a custom Josephus problem-oriented RNA operation combined with basic RNA operations and cipher block chaining (CBC). Based on the results, we found that the customized Josephus problem-based permutation performed more efficiently than traditional methods, whereas the column and row shifting permutation was more robust. By eliminating key sequence coding and item-to-item operations, the proposed RNA operation reduces computational overhead. This video encryption scheme is proven to be effective and resilient at securing video data transmitted over the VLC channel, and it constitutes a significant advancement in areas such as surveillance, medical imaging, and military communication requiring robust secured video data. © 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

关键词： Medical imaging

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Giant long-range dipole-dipole interactions in a plasmonic lattice

Giant long-range dipole-dipole interactions in a plasmonic l...

引用

Frontiers in Optics + Laser Science 2021, FiO+LS 2021 - Part of Frontiers in Optics, FiO 2021

作者： Boddeti, Ashwin K. Guan, Jun Sentz, Tyler Juarez, Xitali Newman, Ward Cortes, Cristian Odom, Teri W. Jacob, Zubin School of Electrical and Computer Engineering Birck Nanotechnology Center Purdue University West LafayetteIN47907 United States Graduate Program in Applied Physics Northwestern University EvanstonIL60208 United States Department of Materials Science and Engineering Northwestern University EvanstonIL60208 United States Intel Corporation BeavertonOR97007 United States Center for Nanoscale Materials Argonne National Laboratory LemontIL60439 United States Graduate Program in Applied Physics Department of Materials Science and Engineering Department of Chemistry Northwestern University EvanstonIL60208 United States

We observe long-range dipole-dipole interactions in a plasmonic lattice. Fluorescence lifetime measurements show density-dependent non-exponential decay dynamics over 800nm mean nearest-neighbour separation distances ... 详细信息

ISBN: (纸本)9781557528209

关键词： Plasmonics

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