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2024 Advanced Solid State Lasers, ASSL 2024

作者： Hirschman, Jack Abedi, Erfan Wang, Minyang Zhang, Hao Lemons, Randy Carbajo, Sergio Department of Applied Physics Stanford University 348 Via Pueblo StanfordCA94305 United States SLAC National Accelerator Laboratory 2575 Sand Hill Rd Menlo ParkCA94025 United States Electrical and Computer Engineering Department UCLA 420 Westwood Los AngelesCA90095 United States Department of Statistics and Data Science UCLA Los AngelesCA90095 United States Physics and Astronomy Department UCLA 475 Portola Plaza Los AngelesCA90095 United States California NanoSystems Institute 570 Westwood Plaza Los AngelesCA90095 United States

We present a novel start-to-end simulation framework for complex cascaded laser systems involving CPA and NLO processes and showcase a machine learning surrogate for sum-frequency generation that achieves a 250x speed...

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Trident-shaped Dual Band Monopole Antenna with Defected Ground Plane for 5G Applications

Trident-shaped Dual Band Monopole Antenna with Defected Grou...

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2022 IEEE Wireless Antenna and Microwave Symposium, WAMS 2022

作者： Sharma, Preeti Tiwari, Rakesh N. Singh, Prabhakar Kumar, Pradeep School of Basic and Applied Sciences Galgotias University Physics Division Greater Noida India Greater Noida Institute of Technology Department of Applied Science Greater Noida India School of Computational and Integrative Sciences Jawaharlal Nehru University New Delhi India Electronic and Computer Engineering University of KwaZulu-Natal Discipline of Electrical Durban South Africa

ISBN: (数字)9781665458467

ISBN: (纸本)9781665458467

This work explores a compact dual band trident-shaped monopole antenna for 5G applications. The designed antenna has dimension 32 × 25 × 1.524 mm3. The structure of the antenna consists of symmetric trident-shaped patch with arrow shaped strip in the center. The L-shaped slots are used to modify the defected ground plane and to obtain the dual band characteristics. The proposed design demonstrates the measured impedance bandwidths in the range 3.27-3.88 GHz (lower band) and 4.85-5.23 GHz (upper band), respectively. The radiation efficiency for both the operating bands are above 76%, the realized average gains are 1.28 dBi and 1.7 dBi across both the operating bands, respectively. The radiation patterns of the monopole antenna are acceptable for 5G applications. The proposed design is modeled and simulated using CST microwave studio. The simulated results agreeing well with the fabricated antenna. © 2022 IEEE.

关键词： Monopole antennas

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Wafer-level fabrication of Fabry- Pérot resonators with finesse exceeding one million

Wafer-level fabrication of Fabry- Pérot resonators with fin...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Naijun Jin Yifan Liu Charles A. McLemore Yizhi Luo David Mason Prashanta Kharel Scott A. Diddams Franklyn Quinlan Peter Rakich Department of Applied Physics Yale University New Haven CT USA National Institute of Standards and Technology Boulder CO USA Department of Physics University of Colorado Boulder Boulder CO USA Electrical Computer and Energy Engineering Boulder CO USA

We demonstrate a wafer-level fabrication technique for high-finesse Fabry-Pérot optical resonators based on reflow and optical contact bonding. These resonators have finesse exceeding one million at 1550 nm and c... 详细信息

ISBN: (纸本)9781957171258

关键词： Cavity quantum electrodynamics Dielectric mirrors Grating couplers Optical resonators Resonant modes Surface roughness measurement

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High-frequency sound wave detection with ease-to-use fiber-ball lens

High-frequency sound wave detection with ease-to-use fiber-b...

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Optica Sensing Congress 2023, AIS, FTS, HISE, Sensors, ES 2023 - Part of Optical Sensors and Sensing Congress 2023

作者： Kim, Hansol Jung, Hongjae Kim, Yeeun Jeong, Yoonchan SNU Laser Laboratory Department of Electrical and Computer Engineering Seoul National University Seoul08826 Korea Republic of Inter-University Semiconductor Research Center Seoul National University Seoul08226 Korea Republic of Institute of Applied Physics Seoul National University Seoul08226 Korea Republic of BK 21 FOUR Seoul National University Seoul08226 Korea Republic of

We propose a fiber-ball lens-based high-frequency sound detection technique. Owing to the excellent coupling efficiency with external signals, we verify that its detection range can go up as high as 16 kHz. © 202...

ISBN: (纸本)9781957171241

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Hybrid fiber-based single-pass cascaded Raman laser generation

Hybrid fiber-based single-pass cascaded Raman laser generati...

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2023 Optica Nonlinear Optics Topical Meeting, NLO 2023

作者： Kim, Hansol Kang, Hyungu Jung, Hongjae Jeong, Yoonchan SNU Laser Laboratory Department of Electrical and Computer Engineering Seoul National University Seoul08826 Korea Republic of Inter-University Semiconductor Research Center Seoul National University Seoul08226 Korea Republic of Institute of Applied Physics Seoul National University Seoul08226 Korea Republic of BK 21 FOUR Seoul National University Seoul08226 Korea Republic of

ISBN: (纸本)9781957171234

We present a hybrid-fiber-based single-pass cascaded Raman laser consisting of a dispersion-shifted fiber combined with other commercial fibers, which outperforms a conventional single-fiber-based Raman laser in terms of stably generating spectral components over 1550 nm. Optica Nonlinear Optics Topical Meeting 2023 © Optica Publishing Group 2023 © 2023 The Author(s)

关键词： Fibers

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Terahertz spin dynamics in rare-earth orthoferrites

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Photonics Insights 2022年第2期1卷 1-56页

作者： Xinwei Li Dasom Kim Yincheng Liu Junichiro Kono Department of Physics California Institute of TechnologyPasadenaUSA Department of Electrical and Computer Engineering Rice UniversityHoustonUSA Applied Physics Graduate Program Smalley-Curl InstituteRice UniversityHoustonUSA Department of Physics and Astronomy Rice UniversityHoustonUSA Department of Materials Science and NanoEngineering Rice UniversityHoustonUSA

Recent interest in developing fast spintronic devices and laser-controllable magnetic solids has sparked tremendous experimental and theoretical efforts to understand and manipulate ultrafast dynamics in *** of spin dynamics in the terahertz(THz)frequency range are particularly important for elucidating microscopic pathways toward novel device ***,we review THz phenomena related to spin dynamics in rare-earth orthoferrites,a class of materials promising for antiferromagnetic *** expand this topic into a description of four key elements.(1)We start by describing THz spectroscopy of spin excitations for probing magnetic phase transitions in thermal *** acoustic magnons are useful indicators of spin reorientation transitions,electromagnons that arise from dynamic magnetoelectric couplings serve as a signature of inversion-symmetry-breaking phases at low temperatures.(2)We then review the strong laser driving scenario,where the system is excited far from equilibrium and thereby subject to modifications to the free-energy *** pathways for ultrafast laser manipulation of magnetic order are discussed.(3)Furthermore,we review a variety of protocols to manipulate coherent THz magnons in time and space,which are useful capabilities for antiferromagnetic spintronic applications.(4)Finally,new insights into the connection between dynamic magnetic coupling in condensed matter and the Dicke superradiant phase transition in quantum optics are *** presenting a review on an array of THz spin phenomena occurring in a single class of materials,we hope to trigger interdisciplinary efforts that actively seek connections between subfields of spintronics,which will facilitate the invention of new protocols of active spin control and quantum phase engineering.

关键词： terahertz spin dynamics magnetism orthoferrite ultrafast spectroscopy magneto-optics

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Femtosecond Filament Coupled with Structured Light for Free Space Optical Communication

Femtosecond Filament Coupled with Structured Light for Free ...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Saad Bin Ali Reza Tianhong Wang Finn Buldt Pascal Bassène Moussa N’Gom Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy NY USA Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute Troy NY USA

We created a 4-bit communication channel for free-space optical communication (FSO) through a segmented space division multiplexing method using structured light coupled with a femtosecond-laser induced filament.

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Electric potential Free-space optical communication Communication channels Lasers and electrooptics Laser beams Ultrafast optics Space division multiplexing

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Non-Hermitian metasurface for asymmetric thermal emission

Non-Hermitian metasurface for asymmetric thermal emission

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Conference on Lasers and Electro-Optics (CLEO)

作者： Ciril S. Prasad Henry O. Everitt Gururaj V. Naik Department of Electrical and Computer Engineering Rice University Houston TX USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX USA U.S. Army DEVCOM Army Research Laboratory-South Houston TX USA

Non-Hermitian optics provides a unique platform to take advantage of absorption losses in materials and control radiative properties. We demonstrate a non-Hermitian metasurface that exhibit directional suppression of ... 详细信息

ISBN: (纸本)9781957171258

关键词： Fused silica Optical constants Photon counting Remote sensing Thermal emission Thermal imaging

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Emergent Ferromagnetism in CaRuO₃/CaMnO₃ (111)-Oriented Superlattices

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Nano Letters 2024年第8期24卷 2567-2573页

作者： Kane, Margaret Bhandari, Churna Holtz, Megan E. Balakrishnan, Purnima P. Grutter, Alexander J. Fitzsimmons, Michael Yang, Chao-Yao Satpathy, Sashi Paudyal, Durga Suzuki, Yuri Department of Materials Science and Engineering Stanford University Stanford 94305 CA United States Ames National Laboratory Iowa State University Ames 50011 IA United States Metallurgical and Materials Engineering Colorado School of Mines Golden 80401 CO United States NIST Center for Neutron Research National Institute of Standards and Technology Gaithersburg 20899 MD United States Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge 37830 TN United States Department of Material Science and Engineering National Yang Ming Chiao Tung University Hsinchu City 30100 Taiwan Department of Physics & Astronomy University of Missouri Columbia 65211 MO United States Department of Applied Physics Stanford University Stanford 94305 CA United States Geballe Laboratory for Advanced Materials Stanford University Stanford 94305 CA United States Department of Electrical and Computer Engineering Iowa State University Ames 50011 IA United States

The boundary between CaRuO3 and CaMnO3 is an ideal test bed for emergent magnetic ground states stabilized through interfacial electron interactions. In this system, nominally antiferromagnetic and paramagnetic materi... 详细信息

The boundary between CaRuO₃ and CaMnO₃ is an ideal test bed for emergent magnetic ground states stabilized through interfacial electron interactions. In this system, nominally antiferromagnetic and paramagnetic materials combine to yield interfacial ferromagnetism in CaMnO₃ due to electron leakage across the interface. In this work, we show that the crystal symmetry at the surface is a critical factor determining the nature of the interfacial interactions. Specifically, by growing CaRuO₃/CaMnO₃ heterostructures along the (111) instead of the (001) crystallographic axis, we achieve a 3-fold enhancement of the magnetization and involve the CaRuO₃ layers in the ferromagnetism, which now spans both constituent materials. The stabilization of a net magnetic moment in CaRuO₃ through strain effects has been long-sought but never consistently achieved, and our observations demonstrate the importance of interface engineering in the development of new functional heterostructures. © 2024 American Chemical Society.

关键词： complex oxides emergent magnetism manganites ruthenatess superlattices

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Retrieving Masked Signal Through Tracking and Wavefront Shaping

Retrieving Masked Signal Through Tracking and Wavefront Shap...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Nazifa Rumman Tianhong Wang Kaitlin Jennings Pascal Bassène Finn Buldt Moussa N’Gom Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy NY USA Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute Troy NY USA

We present a novel approach that tracks and localizes hidden signal inside or behind scattering media. The method combines traditional feedback based wavefront shaping with a switch function that utilizes two differen... 详细信息

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Scattering Switches Laser feedback Media Lasers and electrooptics Electrooptical waveguides

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