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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Papapavlou, Charalampos Paximadis, Konstantinos Gomez, Braulio Marom, Dan M. Tomkos, Ioannis Department of Electrical and Computer Engineering University of Patras Patras26504 Greece Institute of Applied Physics Hebrew University of Jerusalem Israel VPI Photonics GmbH Germany

We analyze a hierarchical optical node architecture supporting flexible band switching using WBSSs across a variety of spatial/spectral granularities from a wavelength channel to full-fiber switching, offering high-pe... 详细信息

关键词： Optical switches

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Real space characterization of nonlinear hall effect in confined directions

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npj Computational Materials 2024年第1期10卷 2829-2835页

作者： Sheng Luo Chuang-Han Hsu Guoqing Chang Arun Bansil Hsin Lin Gengchiau Liang Department of Electrical and Computer Engineering National University of SingaporeSingapore 117576Singapore Institute of Physics Academia SinicaTaipei 11529Taipei Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingaporeSingapore Department of Physics Northeastern UniversityBostonMA 02115USA Industry Academia Innovation School National Yang-Ming Chiao Tung UniversityHsinchu City 300093Taipei

The nonlinear Hall effect(NLHE)is a phenomenon which could produce a transverse Hall voltage in a time-reversal-invariant ***,we report the real space characterizations of NLHE evaluated through quantum transport in TaIrTe4 nanoribbon without the explicit Berry curvature dipole(BCD)*** first characterize the NLHE in both transverse confined directions in global-level *** impact of quantum confinement in NLHE is evaluated by adjusting the width of ***,the probing area is trimmed to the atomic scale to evaluate the local texture,where we discover its patterns differ among the probed neighboring atomic *** analysis of charge distribution reveals the connections between NLHE’s local patterns and its non-centrosymmetric nature,rendering nearly an order of Hall voltage enhancement through probe *** work paves the way to expand the range of NLHE study and unveil its physics in more versatile material systems.

关键词： directions nonlinear confined

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Element-specific high-bandwidth ferromagnetic resonance spectroscopy with a coherent extreme-ultraviolet source

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Physical Review applied 2024年第6期21卷 064047-064047页

作者： Michael Tanksalvala Anthony Kos Jacob Wisser Scott Diddams Hans T. Nembach Justin M. Shaw Applied Physics Division Time & Frequency Division Electrical Computer & Energy Engineering Department of Physics Physical Measurement Laboratory

In this paper, we apply a tabletop, ultrafast, high-harmonic generation (HHG) source to measure the element-specific ferromagnetic resonance (FMR) in ultrathin magnetic alloys and multilayers on an opaque Si substrate. We demonstrate a continuous-wave bandwidth up to 62 GHz, with a promise to extend it to 100 GHz or higher. This laboratory-scale instrument detects the FMR using ultrafast, extreme-ultraviolet (EUV) light, with photon energies spanning the M-edges of the most relevant magnetic elements. A radiofrequency frequency comb generator is used to produce a microwave excitation that is intrinsically synchronized to the EUV pulses with a timing jitter of 1.1 ps or better. We apply this system to measure the dynamics in a multilayer system as well as Ni-Fe and Co-Fe alloys. Since this instrument operates in reflection mode, it is a milestone toward measuring and imaging the dynamics of the magnetic state and spin transport of active devices on arbitrary substrates on a tabletop. The higher bandwidth also enables measurements of materials with high magnetic anisotropy, as well as ferrimagnets, antiferromagnets, and short-wavelength (high-wavevector) spin waves in nanostructures or nanodevices. Furthermore, the coherence and short wavelength of the EUV will enable extending these studies using dynamic nanoscale lensless imaging techniques such as coherent diffractive imaging, ptychography, and holography.

关键词： High-order harmonic generation Magnetization dynamics Magneto-optical Kerr effect Ultrafast phenomena Ferromagnetic resonance Optical nanoscopy Spectroscopy X-ray techniques

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Sensing beyond the exceptional point for high detectivity

Sensing beyond the exceptional point for high detectivity

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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Li, Zhichao Prasad, Ciril S. Wang, Xielin Zhang, Ding Naik, Gururaj V. Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States

Exceptional point (EP)-based optical sensors exhibit exceptional sensitivity but poor detectivity. Slightly off EP operation boosts detectivity without much loss in sensitivity. We experimentally demonstrate a high-detectivity-off-EP plasmonic-photonic hybrid sensor for anti-mouse IgG protein. © Optica Publishing Group 2024

关键词： Hybrid sensors

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Towards Multi-Pbps Backbone Optical Networks in Support of Future 6G Networks

Towards Multi-Pbps Backbone Optical Networks in Support of F...

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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Tomkos, I. Papapavlou, Ch. Uzunidis, D. Moschopoulos, K. Muñoz, R. Marom, D.Μ. Nazarathy, M. Department of Electrical and Computer Engineering University of Patras Patras26504 Greece Castelldefels08860 Spain Institute of Applied Physics Hebrew University of Jerusalem Jerusalem91904 Israel Faculty of Electrical and Computer Engineering Technion Israel Institute of Technology Haifa3200 Israel

We describe innovative concepts associated with optical switching nodes and their transceiver interfaces that enable energy-efficient flexible capacity scaling (≥10 Tb/s per interface, ≥1 Pb/s capacity per link and ... 详细信息

关键词： Optical fiber communication

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Towards Multi-Pbps Backbone Optical Networks in Support of Future 6G Networks

Towards Multi-Pbps Backbone Optical Networks in Support of F...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

ISBN: (纸本)9781957171395

关键词： Transceivers

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Sensing beyond the exceptional point for high detectivity

Sensing beyond the exceptional point for high detectivity

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

ISBN: (纸本)9781957171395

关键词： Laser beams

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Free-electron crystals for enhanced X-ray radiation

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Light(Science & Applications) 2024年第7期13卷 1299-1309页

作者： Lee Wei Wesley Wong Xihang Shi Aviv Karnieli Jeremy Lim Suraj Kumar Sergio Carbajo Ido Kaminer Liang Jie Wong School of Electrical and Electronic Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore. Solid State Institute and Faculty of Electrical and Computer Engineering Technion–Israel Institute of TechnologyHaifa 3200003Israel. School of Electrical Engineering Fleischman Faculty of EngineeringTel Aviv UniversityTel Aviv 69978Israel Department of Applied Physics Stanford UniversityStanfordCA 94305USA. Science Mathematics and TechnologySingapore University of Technology and Design8 Somapah RoadSingapore 487372Singapore. Electrical and Computer Engineering Department UCLA420 WestwoodLos AngelesCA 90095USA. Physics and Astronomy Department UCLA475 Portola PlazaLos AngelesCA 90095USA. SLAC National Accelerator Laboratory Stanford University2575 Sand Hill RoadMenlo ParkCA 94025USA

Bremsstrahlung—the spontaneous emission of broadband radiation from free electrons that are deflected by atomic nuclei—contributes to the majority of X-rays emitted from X-ray tubes and used in applications ranging from medical imaging to semiconductor chip ***,we show that the bremsstrahlung intensity can be enhanced significantly—by more than three orders of magnitude—through shaping the electron wavefunction to periodically overlap with atoms in crystalline ***,we show how to shape the bremsstrahlung X-ray emission pattern into arbitrary angular emission profiles for purposes such as unidirectionality and ***,we find that these enhancements and shaped emission profiles cannot be attributed solely to the spatial overlap between the electron probability distribution and the atomic centers,as predicted by the paraxial and nonrecoil theory for free electron light *** work highlights an unprecedented regime of free electron light emission where electron waveshaping provides multi-dimensional control over practical radiation processes like *** results pave the way towards greater versatility in table-top X-ray sources and improved fundamental understanding of quantum electron-light interactions.

关键词： overlap attributed arbitrary

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State-Space Modeling of Nonlinear Electrostatic Transducers and Experimental Characterization Using LDV 41st

State-Space Modeling of Nonlinear Electrostatic Transducers ...

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41st IMAC, A Conference and Exposition on Structural Dynamics, 2023

作者： Meng, Yuqi Niu, Xiaoyu Williams, Randall P. Vatankhah, Ehsan Liu, Zihuan Hall, Neal A. Chandra Department of Electrical and Computer Engineering The University of Texas at Austin AustinTX United States Applied Physics Laboratory University of Washington SeattleWA United States

ISBN: (纸本)9783031369988

Electrostatic speakers and ultrasound transmitters, including capacitive micromachined ultrasound transducers (CMUTs), may be thought of as systems with applied voltage as the input variable and diaphragm displacement and sound pressure as the output variables. These electrostatically actuated systems are inherently nonlinear. Electrostatic pressure is proportional to the square of the applied voltage and is inversely proportional to the cube of the time-varying diaphragm-backplate gap spacing. The squeeze film damping coefficient is also dependent on the time-varying gap spacing. For large diaphragm displacement, strain stiffening of the diaphragm can also affect the transducer dynamics. These nonlinear systems are most commonly driven in a linear regime, whereby the moving diaphragm is biased to an operating point with a large static voltage and a relatively small dynamic signal voltage is superimposed to provide actuation of the diaphragm. In recent work, we have demonstrated advantages of exploiting the full operating range of electrostatic transducers, not restricted to a linear operating regime. Our recent focus has been on using commonly available MEMS microphone structures as airborne ultrasonic projectors at frequencies of up to 100 kHz. Although designed as receivers to work in the audible range, these commercial devices are effective as ultrasound transmitters. A large dynamic input voltage is applied to force the diaphragm to traverse the full diaphragm-backplate gap, typically 2 μ m. Electrostatic pull-in,whereby the diaphragm contacts the backplate,can be exploited as a braking feature to instantaneously eliminate diaphragm ring-down and increase the bandwidth of generated waveforms. Having an accurate model for these nonlinear devices is advantageous. A state-space model based on a segmented diaphragm approach has recently been summarized in prior work. The model is suitable for time-domain simulations of the movement of the diaphragm in response to i

关键词： Diaphragms

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Seafloor Imaging Maps by Incorporating Side Scan Sonar Technology on Hybrid Autonomous Underwater Glider 6

Seafloor Imaging Maps by Incorporating Side Scan Sonar Techn...

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6th International Seminar on Research of Information Technology and Intelligent Systems, ISRITI 2023

作者： Atmaja, Ardian Budi Kusuma Hidayat, Egi Muhammad Idris Riyanto Trilaksono, Bambang Siregar, Simon Habibullah, Natsir School of Electrical Engineering and Informatics Institut Teknologi Bandung Bandung Indonesia Institut Teknologi Bandung Telkom University Doctoral Program of Electrical Engineering Department Computer Engineering Faculty of Applied Science Indonesia

ISBN: (纸本)9798350358346

This research aims to construct a two-dimensional image to represent an underwater geometry map with a Side Scan Sonar (SSS) mounted on a Hybrid Autonomous Underwater Glider (HAUG). Building the underwater map has two stages of the process. The first stage is preprocessing which includes Time-varying gains (TVG), slant range correction, and ground range correction. The second is HAUG navigation, the movement of HAUG orientation to the angle and distance of SSS readings and plotting the geometry of the grid map. With these two stages, a two-dimensional grid map will be formed. Meanwhile, the 3D plot utilizes slant range and ground range correction to obtain the surface height of the bottom of the pool. From the experiments conducted to conduct mapping in the pool, two-dimensional and three-dimensional visual forms of the pool floor and pool walls were produced. The results of the estimated measurement of the width of the pool obtained 14.05 meters and the height of the pool 3.199 meters with an SSS beam angle of 58 degrees. © 2023 IEEE.

关键词： Geometry

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