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Beyond Bounds on Light Scattering with Complex Frequency Excitations

Physical Review Letters 2022年第20期129卷 203601-203601页

作者： Seunghwi Kim Sergey Lepeshov Alex Krasnok Andrea Alù Photonics Initiative Advanced Science Research Center City University of New York New York New York 10031 USA DTU Electro Department of Electrical and Photonics Engineering Technical University of Denmark Ørsteds Plads 343 Kgs. Lyngby DK-2800 Denmark Department of Electrical and Computer Engineering Florida International University Miami Florida 33174 USA Physics Program Graduate Center City University of New York New York New York 10016 USA

Light scattering is one of the most established wave phenomena in optics, lying at the heart of light-matter interactions and of crucial importance for nanophotonic applications. Passivity, causality, and energy conservation imply strict bounds on the degree of control over scattering from small particles, with implications on the performance of many optical devices. Here, we demonstrate that these bounds can be surpassed by considering excitations at complex frequencies, yielding extreme scattering responses as tailored nanoparticles reach a quasi-steady-state regime. These mechanisms can be used to engineer light scattering of nanostructures beyond conventional limits for noninvasive sensing, imaging, and nanoscale light manipulation.

关键词： Metamaterials Mie scattering

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Reconfigurable chiral phase change nanomaterials

Reconfigurable chiral phase change nanomaterials

引用

Conference on Lasers and electro-optics (CLEO)

作者： Joshua A. Burrow Md Shah Alam Evan M. Smith Riad Yahiaoui Ryan Laing Piyush J. Shah Thomas Searles Shivashankar Vangala Joshua R. Hendrickson Andrew Sarangan Imad Agha Electro-Optics Department University of Dayton Dayton OH USA School of Engineering Brown University Providence RI USA KBR Inc. Beavercreek OH USA Department of Electrical & Computer Engineering University of Illinois Chicago Chicago IL USA Physics Department University of Dayton Dayton OH USA Apex Microdevices LLC West Chester OH USA Air Force Research Laboratory Sensors Directorate Wright-Patterson AFB Ohio USA

We realize intrinsically chiral phase change material nano-helices that achieves the critical goal of demonstrating high-speed temporal control of opto-chirality over 50,000 cycles in Ge 2 Sb 2 Te 5 .

ISBN: (纸本)9781957171258

关键词： Germanium Imaging systems Mueller matrices Nanomaterials Optical activity White light

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Quantum Atomic Matter Near Two-Dimensional Materials in Microgravity

arXiv

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arXiv 2023年

作者： Maestro, Adrian Del Kim, Sang Wook Bigelow, Nicholas P. Thompson, Robert J. Kotov, Valeri N. Department of Physics and Astronomy Min H. Kao Department of Electrical Engineering and Computer Science Institute for Advanced Materials and Manufacturing University of Tennessee KnoxvilleTN37996 United States Department of Physics and Materials Science Program University of Vermont BurlingtonVT05405 United States Department of Physics and Astronomy Institute of Optics Center for Coherence and Quantum Optics University of Rochester RochesterNY14627 United States Jet Propulsion Laboratory California Institute of Technology PasadenaCA91109 United States

Novel two-dimensional (2D) atomically flat materials, such as graphene and transition-metal dichalcogenides, exhibit unconventional Dirac electronic spectra. We propose to effectively engineer their interactions with cold atoms in microgravity, leading to a synergy between complex electronic and atomic collective quantum phases and phenomena. Dirac materials are susceptible to manipulation and quantum engineering via changes in their electronic properties by application of strain, doping with carriers, adjustment of their dielectric environment, etc. Consequently the interaction of atoms with such materials, namely the van der Waals / Casimir-Polder interaction, can be effectively manipulated, leading to the potential observation of physical effects such as Quantum Reflection off atomically thin materials and confined Bose-Einstein Condensate (BEC) frequency shifts. Copyright © 2023, The Authors. All rights reserved.

关键词： Transition metals

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Manipulating Fano coupling in an opto-thermoelectric field

arXiv

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arXiv 2024年

作者： Lin, Linhan Lepeshov, Sergey Krasnok, Alex Huang, Yu Jiang, Taizhi Peng, Xiaolei Korgel, Brian A. Alu, Andrea Zheng, Yuebing State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua University Beijing100084 China Department of Electrical and Photonics Engineering DTU Electro Technical University of Denmark Building 343 Kgs. LyngbyDK-2800 Denmark Department of Electrical and Computer Engineering Florida International University MiamiFL33174 United States School of Physics and Electronics Hunan University Changsha410082 China Mc Ketta Department of Chemical Engineering The University of Texas at Austin AustinTX78712 United States Materials Science & Engineering Program Texas Materials Institute The University of Texas at Austin AustinTX78712 United States Department of Electrical and Computer Engineering The University of Texas at Austin AustinTX78712 United States Advanced Science Research Center City University of New York New YorkNY10031 United States Physics Program Graduate Center City University of New York NY10016 United States Walker Department of Mechanical Engineering The University of Texas at Austin AustinTX78712 United States

Fano resonances in photonics arise from the coupling and interference between two resonant modes in structures with broken symmetry. They feature an uneven and narrow and tunable lineshape, and are ideally suited for optical spectroscopy. Many Fano resonance structures have been suggested in nanophotonics over the last ten years, but reconfigurability and tailored design remain challenging. Herein, we propose an all-optical "pick-and-place" approach aimed at assemble Fano metamolecules of various geometries and compositions in a reconfigurable manner. We study their coupling behavior by in-situ dark-field scattering spectroscopy. Driven by a light-directed opto-thermoelectric field, silicon nanoparticles with high quality-factor Mie resonances (discrete states) and low-loss BaTiO3 nanoparticles (continuum states) are assembled into all-dielectric heterodimers, where distinct Fano resonances are observed. The Fano parameter can be adjusted by changing the resonant frequency of the discrete states or the light polarization. We also show tunable coupling strength and multiple Fano resonances by altering the number of continuum states and discrete states in dielectric heterooligomers. Our work offers a general design rule for Fano resonance and an all-optical platform for controlling Fano coupling on demand. Copyright © 2024, The Authors. All rights reserved.

关键词： Light polarization

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Generation of four-dimensional hyperentangled NOON states and beyond with photonic orbital angular momentum and detection-basis control

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Physical Review A 2022年第3期105卷 032445-032445页

作者： José César Guerra Vázquez Emmanuel Narváez Castañeda Roberto Ramírez Alarcón Imad Agha Qiwen Zhan William N. Plick Department of Electro-Optics and Photonics University of Dayton Dayton Ohio 45469 USA Centro de Investigaciones en Óptica A.C. Loma del Bosque 115 Colonia Lomas del Campestre 37150 León Guanajuato México Department of Physics University of Dayton Dayton Ohio 45469 USA School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai 200093 China

Hyperentanglement of photonic light modes is a valuable resource in quantum information processing and quantum communication. Here we propose a protocol using the interference of two optical nonlinearities and control of the heralding (detection) basis in the orbital angular momentum degree of freedom. This setup is capable of generating states which are both maximally entangled and hyperentangled in at least four dimensions. The resultant state in the four-dimensional case is a generalization of the so-called NOON state (a maximally path-entangled state well known in quantum optics). The production of this state is “perfect” (in other words noiseless) at least in the ideal case, excluding experimental imperfections. The presented setup is very versatile, and with control of the detection and pumping protocols a massively large parameter space, of arbitrarily large dimensionality, may be searched for other states of interest. Also, we present a few specific cases to demonstrate the versatility of the system.

关键词： Measurement-based quantum computing Quantum communication Quantum computation Quantum entanglement Quantum information architectures & platforms Quantum metrology Quantum sensing

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Super-resolution imaging and optomechanical manipulation using optical nanojet for non-destructive single-cell research

arXiv

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arXiv 2021年

作者： Karabchevsky, Alina Elbaz, Tal Katiyi, Aviad Prager, Ofer Friedman, Alon School of Electrical and Computer Engineering Electro-Optics and Photonics Engineering Department Ben-Gurion University of the Negev Beer-Sheva Israel Faculty of Health Science Ben-Gurion University of the Negev Beer-Sheva Israel

Advanced photonic tools may enable researchers and clinicians to visualize, track, control and manipulate biological processes at the single-cell level in space and time. Biological systems are complex and highly organized on both spatial and temporal levels. If we are to study, perturb, engineer or heal biological entities, we must be able to visualize key players in such systems and to track, control and manipulate them precisely and selectively. To achieve this goal, the engineering of non-destructive tools will allow us to interrogate and manipulate the function of proteins, pathways and cells for physicians, enabling the design of ‘smart materials’ that can direct and respond to biological processes on-demand. Among the potentially exploitable non-destructive tools, light-based actuation is particularly desirable, as it enables high spatial and temporal resolution, dosage control, minimal disturbance to biological systems and deep tissue penetration. Here, we overview existing approaches toward the engineering of light-activated tools for the interrogation and manipulation of single-cell processes, and list the types of studies and types of functions that can be controlled by light. Timely applications, such as studies of inflammation and of crossing brain barrier systems - via super-resolution imaging and optomechanical manipulation - are two representative examples of emerging applications so far never addressed. © 2021, CC BY.

关键词： Cytology

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Investigation of a complete squeeze-film damping model for MEMS devices

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Microsystems & Nanoengineering 2021年第4期7卷 67-79页

作者： Qianbo Lu Weidong Fang Chen Wang Jian Bai Yuan Yao Jiaxiao Chen Xiang Xu Wei Huang Ningbo Institute of Northwestern Polytechnical University Frontiers Science Center for Flexible Electronics(FSCFE)MIIT Key Laboratory of Flexible Electronics(KLoFE)Shaanxi Key Laboratory of Flexible Electronics(KLoFE)Institute of Flexible Electronics(IFE)Northwestern Polytechnical University710072 Xi'anShaanxiChina College of Optical Science and Engineering State Key Laboratory of Modern Optical InstrumentationZhejiang University310027 HangzhouChina Department of Electrical Engineering and Computer Science University of LiegeLiegeBelgium ESAT-MNS University of Leuven3001 LeuvenBelgium Huazhong University of Science and Technology-Wuhan National Laboratory for Optoelectronics 430074 HubeiChina Huazhong Institute of Electro-Optics-Wuhan National Lab for Optoelectronics 430074 HubeiChina

Dynamic performance has long been critical for micro-electro-mechanical system(MEMS)devices and is significantly affected by *** structural vibration conditions lead to different damping effects,including border and amplitude effects,which represent the effect of gas flowing around a complicated boundary of a moving plate and the effect of a large vibration amplitude,*** models still lack a complete understanding of damping and cannot offer a reasonably good estimate of the damping coefficient for a case with both *** efforts have been undertaken to consider these two effects,yet a complete model has remained *** paper investigates the dynamic performance of vibrated structures via theoretical and numerical methods simultaneously,establishing a complete model in consideration of both effects in which the analytical expression is given,and demonstrates a deviation of at least threefold lower than current studies by simulation and experimental *** complete model is proven to successfully characterize the squeeze-film damping and dynamic performance of oscillators under comprehensive ***,a series of simulation models with different dimensions and vibration statuses are introduced to obtain a quick-calculating factor of the damping coefficient,thus offering a previously unattainable damping design guide for MEMS devices.

关键词： film complete offering

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Blue micro-LED with a red/green blended polymer film for 3.5-Gbps visible light communication employing adaptive SNR-Flattening Algorithm

Next Nanotechnology

引用

Next Nanotechnology 2024年 5卷

作者： Ho, Pin-Wei Cheng, Chih-Hsien Liao, Yu-Sheng Chi, Yu-Chieh Sadhu, Annada Sankar Matsumoto, Atsushi Akahane, Kouichi Chen, Li-Yin Kuo, Hao-Chung Lin, Gong-Ru Graduate Institute of Photonics and Optoelectronics and Department of Electrical Engineering National Taiwan University Taipei 106319 Taiwan National Institute of Information and Communications Technology Koganei Tokyo 184-8795 Japan SANWAY OPTOELECTRONICS TECH. CORP New Taipei City 235601 Taiwan Department of Photonics Institute of Electro-Optical Engineering College of Electrical and Computer Engineering National Yang Ming Chiao Tung University Hsinchu 30010 Taiwan International Ph.D. Program in Photonics (UST) College of Electrical and Computer Engineering National Yang Ming Chiao Tung University Hsinchu 30010 Taiwan Semiconductor Research Center Hon Hai Research Institute Taipei 11492 Taiwan NTU-Tektronix Joint Research Center Tektronix Inc. and National Taiwan University Taipei 106319 Taiwan

By the semipolar blue single GaN μ-LED and blended Ir(piq)2(acac) + CC-MP5 polymer thin film color converter, a high-speed white-light μ-LED-based system is built up for the applications of short-distance VLC. The characteristics and properties of both devices are analyzed to understand the requirements for transmission and illumination. By selecting the growing orient, the influence of QCSE is reduced in this GaN μ-LED. Meanwhile, possessing the low reflection characteristic, it is beneficial for signal modulation. For the polymer thin film color converter with a lifetime of 7.8 ns, low surface reflection and high conversion efficiency are thought of good properties. Color-converted cool white light has a CCT of around 7000 K and high color accuracy with a CRI of about 90. The APD-combined frequency responses of the GaN μ-LED and GaN μ-LED + polymer are measured as 750 MHz and 600 MHz, respectively. After the optimization by utilizing the adaptive SNR-flattening pre-emphasis algorithm, the transmission performance of the white-light μ-LED is significantly promoted. For NRZ-OOK encoding, a 1.4 Gbps 0.15-m free-space transmission is achieved with a rising time of 656.33 ps, a falling time of 493.32 ps, and a Q-factor of 4.75. Besides, in more advanced data formats, the performance of this white-light μ-LED can be better highlighted. For the same 0.15-m free-space VLC, a high-speed 3 Gbps broadband 8-QAM-OFDM transmission is fulfilled with an EVM of 23.9%, an average SNR of 12.5, and a BER below 3.8 × 10^-3;while to the best of our knowledge, a record 3.5 Gbps BL-DMT transmission is implemented as well. This white-light μ-LED can also be integrated into large-scale arrays for multi-functional VLC applications. © 2024 The Authors

关键词： Adaptive SNR-Flattening algorithm Blue micro-LED Red/Green blended polymer Visible light communication

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General Architecture for Unsupervised Single-Image Super-Resolution of Single Band Nano-SatelliteBGUSat via Image-specific feature extraction 73

General Architecture for Unsupervised Single-Image Super-Res...

引用

73rd International Astronautical Congress, IAC 2022

作者： Mishra, Divya Hadar, Ofer Dror, Itai Maman, Shimrit Zagrizak, Linoy Aspir, Lipaz Choukroun, Daniel Blumberg, Dan G. Geltser, Yakov Nisany, Ofir Shyriayev, Alexander School of Electrical and Computer Engineering Ben Guion University of the Negev David Ben Gurion Blvd 1 Be'er Sheva84105 Israel Homeland Security Institute Ben Guion University of the Negev David Ben Gurion Blvd 1 Be'er Sheva84105 Israel Department of Geography and Environmental Development Ben Guion University of the Negev David Ben Gurion Blvd 1 Be'er Sheva84105 Israel Department of Physics Ben Guion University of the Negev David Ben Gurion Blvd 1 Be'er Sheva84105 Israel Department of Mechanical Engineering Ben Guion University of the Negev David Ben Gurion Blvd 1 Be'er Sheva84105 Israel Department of Electro-optics and Photonics Ben Guion University of the Negev David Ben Gurion Blvd 1 Be'er Sheva84105 Israel

BGUSAT, the first Israeli research CubeSat, is a nanosatellite joint venture between Ben-Gurion University of the Negev, IAI (Israel Aerospace Industries) and ISA (Israeli Space Agency). It is a Low Earth Orbit (LEO) 3U CubeSat imaging Earth in the Short Wave Infra-Red (SWIR) spectrum. The satellite has been fully operational since Feb. 15th, 2017, and has already collected many images of the Earth, claiming mission success for the technology part. Image enhancement is highly required for further data capacity and valuable intelligence extraction from the acquired images that are already at 600m spatial resolution. Image super-resolution is a continuous demanding topic in computer-vision community in recent decades and has witnessed impressive applications on increasing the spatial resolution in every field as medical, agriculture, remote sensing, defense security and many more applications. Further, deep learning-based image super-resolution methods have shown tremendous improvement in reconstruction performance. However, most of the recent state-of-the-art deep learning-based methods for image super-resolution assume an ideal degradation kernel (like bicubic down-sampling) on standard datasets. These approaches perform poorly on real-world satellite images in practice as real degradations are far away and more complex in nature than pre-defined assumed kernels. With this drawback in mind, various state-of-the-art kernel estimation-based methods have evolved via iterative approaches like Iterative Kernel Correction (IKC), InternalGAN (InGAN) and Correction filter for blind super-resolution. However, iterative kernel estimation-based approaches are not only time consuming, but also require complex objective functions along with regularization. Motivated by this real-time challenge, our idea is to enhance the resolution particularly for images from BGUSat-a nano-satellite, that is currently at 600m spatial resolution, implicitly defines an image-specific features in

关键词： Image enhancement

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Exploring the Non - Hermitian Topology of Exceptional Points in Lasers and Fiber Loops

Exploring the Non - Hermitian Topology of Exceptional Points...

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Conference on Lasers and electro-optics Europe (CLEO EUROPE)

作者： Alexander Schumer Hadiseh Nasari Yuzhou G. N. Liu Gisela Lopez-Galmiche Jason Leshin Helena E. Lopez-Aviles Lei Ding Yousef Alahmadi Absar U. Hassan Qi Zhong Stefan Rotter Patrick LiKamWa Demetrios N. Christodoulides Mercedeh Khajavlkhan Institutefor Theoretical Physics Vienna University of Technology (TU Wien) Vienna Austria Ming Hsieh Department of Electrical and Computer Engineering University of Southern California Los Angeles USA CREOL The College of Optics & Photonics University of Central Florida Orlando FL USA Center of Excellence for Telecomm Applications Joint Centers of Excellence Program King Abdul Aziz City for Science and Technology Riyadh Saudi Arabia Department of Physics & Astronomy University of Southern California Los Angeles CA USA

ISBN: (纸本)9798350345995

When non-Hermitian eigenvalue surfaces form intertwined Riemann surfaces, the corresponding non-Hermitian singularities, also know as exceptional points (EPs), are located at the center of this specific topology. Various experimental platforms have recently been presented in which interesting new physics associated with these branch point singularities can be explored. In particular, it has been shown that dynamically encircling EPs may lead to a so-called chiral state transfer. The chirality in this context refers to the fact that in such an encircling protocol, the final state at the end of an EP -enclosing loop solely depends on the encircling direction (clockwise or counterclockwise), but not on the initial state. Such a chiral behavior is intrinsically linked to the state vector deviating from adiabatically following the system's eigenstates associated with the eigenvalue surfaces; instead, due to the non-Hermitian violation of the adiabatic theorem, non-adiabatic jumps let the system undergo transitions from lossy eigenstates to eigenstates with gain. Here, we present two experiments that implement concepts that go beyond this established paradigm.

关键词： Attenuation Chirality Fiber lasers Lasers Surfaces Waveguides

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