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Visible blind, wearable, and omnidirectional near infrared photodetector: A filterless approach

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Visible blind, wearable, and omnidirectional near infrared p...

Frontiers in Optics, FIO 2019 - Part of Frontiers in Optics + Laser science APS/DLS

作者： Kataria, Monika Wang, Wei-Hua Chen, Yang-Fang Institute of Atomic and Molecular Sciences Academia Sinica Taipei115 Taiwan Department of Physics National Central University Chung-Li320 Taiwan Molecular Science and Technology Program Taiwan International Graduate Program Institute of Atomic and Molecular Sciences Academia Sinica Taipei115 Taiwan Department of Physics National Taiwan University Taipei106 Taiwan Advanced Research Centre Green Materials Science and Technology National Taiwan University Taipei10617 Taiwan

ISBN: (纸本)9781943580675

We present a highly sensitive, filtlerless, visible blind, omnidirectional and wearable near infrared photodetector suitable for next generation of wearable technologies. Here, the hybrid device constituents include lanthanides doped upconversion nanoparticles, graphene and micro-pyramidical poly(dimethylsiloxane) film. This hybrid device exhibits ultra-high responsivity of ~ 800 AW-1 at VDS = 1 V under 0.07 µW of 980 nm laser illumination. The novel design of the device makes it user friendly, light weight, durable and transparent. © OSA 2019. The Author(s).

关键词： Wearable technology

All-optical nonreciprocal response in a ring resonator integrating transition metal dichalcogenides

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All-optical nonreciprocal response in a ring resonator integ...

Conference on Lasers and Electro-Optics (CLEO)

作者： Yuma Kawaguchi Sriram Guddala Filipp Komissarenko Svetlana Kiriushechkina Anton Vakulenko Kai Chen Andrea Alù Vinod M. Menon Alexander B. Khanikaev Department of Electrical Engineering Grove School of Engineering City College of the City University of New York New York NY USA Physics Program Graduate Center of the City University of New York New York NY USA Photonics Initiative Advanced Science Research Center City University of New York New York NY USA Department of Physics City College of New York New York NY USA

The photoinduced nonreciprocity was experimentally observed in WS2 monolayer pumped by circularly polarized light. Based on this, we propose a theoretical model of nonreciprocal optical ring resonator integrating vall... 详细信息

ISBN: (数字)9781957171050

ISBN: (纸本)9781665466660

关键词： Laser theory Metals Ring lasers Lasers and electrooptics Laser modes Optical ring resonators Laser transitions

Passive Bias-Free Nonreciprocal Metasurfaces Based on Nonlinear Quasi-Bound States in the Continuum

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arXiv 2022年

作者： Cotrufo, Michele Cordaro, Andrea Sounas, Dimitrios L. Polman, Albert Alù, Andrea Photonics Initiative Advanced Science Research Center City University of New York New YorkNY10031 United States Van der Waals-Zeeman Institute Institute of Physics University of Amsterdam Science Park 904 Amsterdam1098 XH Netherlands Center for Nanophotonics AMOLF Science Park 104 Amsterdam1098 XG Netherlands Department of Electrical and Computer Engineering Wayne State University DetroitMI48202 United States Physics Program Graduate Center of the City University of New York New YorkNY10016 United States

Nonreciprocal devices – in which light is transmitted with different efficiencies along opposite directions – are key technologies for modern photonic applications, yet their compact and miniaturized implementation remains an open challenge. Among different avenues, nonlinearity-induced nonreciprocity has attracted significant attention due to the absence of external bias and integrability within conventional material platforms. So far, nonlinearity-induced nonreciprocity has been demonstrated only in guided platforms using high-Q resonators. Here, we demonstrate ultrathin optical metasurfaces with large nonreciprocal response for free-space radiation based on silicon third-order nonlinearities. Our metasurfaces combine an out-of-plane asymmetry – necessary to obtain nonreciprocity – with in-plane broken symmetry, which finely tunes the radiative linewidth of quasi-bound states in the continuum (q-BICs). Third-order nonlinearities naturally occurring in silicon, engaged by q-BICs, are shown to enable over 10 dB of nonreciprocal transmission while maintaining less than 3 dB in insertion loss. The demonstrated devices merge the field of nonreciprocity with ultrathin metasurface technologies, offering an exciting functionality for signal processing and routing, communications, and protection of high-power laser cavities. © 2022, CC BY.

关键词： High power lasers

The Japanese Vision for the Black Hole Explorer Mission

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arXiv 2024年

作者： Akiyama, Kazunori Niinuma, Kotaro Hada, Kazuhiro Doi, Akihiro Hagiwara, Yoshiaki Higuchi, Aya E. Honma, Mareki Kawashima, Tomohisa Kolev, Dimitar Koyama, Shoko Masui, Sho Ohsuga, Ken Sano, Hidetoshi Takami, Hideki Tsunetoe, Yuh Uzawa, Yoshinori Akahori, Takuya Akiyama, Yuto Galison, Peter Hayashi, Takayuki J. Hirota, Tomoya Inoue, Makoto Iwata, Yuhei Johnson, Michael D. Kino, Motoki Kofuji, Yutaro Mizuno, Yosuke Moriyama, Kotaro Nagai, Hiroshi Nakamura, Kenta Notsu, Shota Ono, Fumie Oya, Yoko Oyama, Tomoaki Rana, Hannah Saida, Hiromi Saito, Ryo Saito, Yoshihiko Sasada, Mahito Sawada-Satoh, Satoko Takahashi, Mikiya M. Takamura, Mieko Tong, Edward Tsuji, Hiroyuki Yoshioka, Shogo Watanabe, Yoshimasa Massachusetts Institute of Technology Haystack Observatory WestfordMA01886 United States Mizusawa VLBI Observatory National Astronomical Observatory of Japan Iwate023-0861 Japan Black Hole Initiative Harvard University CambridgeMA02138 United States Graduate School of Sciences and Technology for Innovation Yamaguchi University Yamaguchi753-8512 Japan The Graduate School of Science Nagoya City University Aichi467-0001 Japan Institute of Space and Astronautical Science Japan Aerospace Exploration Agency Kanagawa252-5210 Japan Department of Space and Astronautical Science The Graduate University for Advanced Studies SOKENDAI Kanagawa229-8510 Japan Natural Science Laboratory Toyo University Tokyo112-8606 Japan Division of Science School of Science and Engineering Tokyo Denki University Saitama350-0394 Japan Department of Astronomy Graduate School of Science The University of Tokyo Tokyo113-0033 Japan Institute for Cosmic Ray Research The University of Tokyo Chiba277-8582 Japan Space Communication Systems Laboratory Wireless Networks Research Center National Institute of Information and Communications Technology Tokyo184-8795 Japan Graduate School of Science and Technology Niigata University Niigata950-2181 Japan Advanced Technology Center National Astronomical Observatory of Japan Tokyo181-8588 Japan Center for Computational Sciences University of Tsukuba Ibaraki305-8577 Japan Faculty of Engineering Gifu University Gifu501-1193 Japan Harvard University CambridgeMA02138 United States Azabu Junior and Senior High School Tokyo106-0046 Japan Astronomical Science Program The Graduate University for Advanced Studies SOKENDAI Tokyo181-8588 Japan Institute of Astronomy and Astrophysics Academia Sinica Taipei10617 Taiwan Center for Astrophysics Harvard & Smithsonian CambridgeMA02138 United States Kogakuin University of Technology & Engineering Academic Support Center 2665-1 Nakano Hachioji Tokyo192-0015 Japan Tsung-Dao Lee Institut

The Black Hole Explorer (BHEX) is a next-generation space very long baseline interferometry (VLBI) mission concept that will extend the ground-based millimeter/submillimeter arrays into space. The mission, closely aligned with the science priorities of the Japanese VLBI community, involves an active engagement of this community in the development of the mission, resulting in the formation of the Black Hole Explorer Japan Consortium. Here we present the current Japanese vision for the mission, ranging from scientific objectives to instrumentation. The Consortium anticipates a wide range of scientific investigations, from diverse black hole physics and astrophysics studied through the primary VLBI mode, to the molecular universe explored via a potential single-dish observation mode in the previously unexplored 50-70 GHz band that would make BHEX the highest-sensitivity explorer ever of molecular oxygen. A potential major contribution for the onboard instrument involves supplying essential elements for its high-sensitivity dual-band receiving system, which includes a broadband 300 GHz SIS mixer and a space-certified multi-stage 4.5K cryocooler akin to those used in the Hitomi and XRISM satellites by the Japan Aerospace Exploration Agency. Additionally, the Consortium explores enhancing and supporting BHEX operations through the use of millimeter/submillimeter facilities developed by the National Astronomical Observatory of Japan, coupled with a network of laser communication stations operated by the National Institute of Information and Communication Technology. Copyright © 2024, The Authors. All rights reserved.

关键词： Radio astronomy

Spin correlation coefficient for proton-He3 elastic scattering at 100 MeV

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Physical Review C 2022年第5期106卷 054002-054002页

作者： A. Watanabe S. Nakai K. Sekiguchi A. Deltuva S. Goto K. Hatanaka Y. Hirai T. Ino D. Inomoto M. Inoue S. Ishikawa M. Itoh H. Kanda H. Kasahara Y. Maeda K. Miki K. Nonaka H. J. Ong H. Oshiro D. Sakai H. Sakai S. Shibuya D. T. Tran H. Umetsu Y. Utsuki T. Wakasa Department of Physics Tokyo Institute of Technology Tokyo 152-8551 Japan Department of Physics Tohoku University Sendai 980-8578 Japan Graduate Program on Physics for the Universe (GP-PU) Tohoku University Sendai 980-8578 Japan Institute of Theoretical Physics and Astronomy Vilnius University Saulėtekio al. 3 LT-10257 Vilnius Lithuania Department of Physics Kyushu University Fukuoka 819-0395 Japan Research Center for Nuclear Physics Osaka University Ibaraki 567-0047 Japan High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 Japan Science Research Center Hosei University Tokyo 102-8160 Japan Cyclotron and Radioisotope Center Tohoku University Sendai 980-8578 Japan Faculty of Engineering University of Miyazaki Miyazaki 889-2192 Japan Institute of Modern Physics (IMP) Chinese Academy of Sciences Lanzhou 730000 China RIKEN Nishina Center Wako 351-0198 Japan Institute of Physics Vietnam Academy of Science and Technology Hanoi 10000 Vietnam

We present the measured spin correlation coefficient Cy,y for p−He3 elastic scattering at 100 MeV at the angles θc.m.=46.9∘–149.2∘ in the center-of-mass system. The Cy,y data and the existing cross section data are compared with rigorous four-nucleon scattering calculations based on realistic nucleon-nucleon potentials. Large differences are seen in the regime around the cross section minimum for both observables. The Δ-isobar effects estimated by the NN+NΔ coupled-channels approach are small for the cross section. Meanwhile, in Cy,y, the Δ-isobar effects improve the agreement with the data. The analysis of the p−He3 elastic scattering amplitudes implies the necessity of three-nucleon forces (3NFs) that enhance the vector components in the amplitudes. The obtained results indicate that the spin correlation coefficient Cy,y expands the knowledge of the nuclear interactions with the Δ isobar or those including 3NFs that are masked in nucleon-deuteron elastic scattering.

关键词： Few-body systems H & He induced nuclear reactions Nuclear forces Nucleon-nucleon interactions

Disorder in AdS3/CFT2

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arXiv 2022年

作者： Dorband, Moritz Grumiller, Daniel Meyer, René Zhao, Suting Institute for Theoretical Physics and Astrophysics Julius–Maximilians–Universität Würzburg Am Hubland Würzburg97074 Germany Würzburg-Dresden Cluster of Excellence ct.qmat Germany Institute for Theoretical Physics TU Wien Wiedner Hauptstrasse 8-10/136 ViennaA-1040 Austria Theoretical Sciences Visiting Program Okinawa Institute of Science and Technology Graduate University Onna904-0495 Japan

We perturbatively study marginally relevant quenched disorder in AdS3/CFT2 to second order in the disorder strength. Using the Chern–Simons formulation of AdS3 gravity for the Poincaré patch, we introduce disorder via the chemical potentials. We discuss the bulk and boundary properties resulting from the disorder-averaged metric. The disorder generates a small mass and angular momentum. In the bulk and the boundary, we find unphysical features due to the disorder average. Motivated by these features, we propose a Poincaré–Lindstedt-inspired resummation method. We discuss how this method enables us to remove all of the unphysical features and compare with other approaches to averaging. © 2022, CC BY.

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Optically Tunable Many-Body Exciton-Phonon Quantum Interference

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Advanced science 2024年第40期11卷 e2404741页

作者： Chang, Si-Jie Huang, Po-Chun Su, Jia-Sian Hsieh, Yu-Wei Quiroz Reyes, Carlos Jose Fan, Ting-Hsuan Sun, Han-Sheng Nguyem, Ai-Phuong Liu, Te-I Cheng, Ho-Wen Lin, Ching-Wei Hayashi, Michitoshi Yong, Chaw-Keong Department of Physics National Taiwan University Taipei10617 Taiwan Institute of Atomic and Molecular Sciences Academia Sinica Taipei106319 Taiwan International Ph.D. Program in Biomedical Engineering College of Biomedical Engineering Taipei Medical University New Taipei235603 Taiwan Department of Chemistry National Tsing Hua University Hsinchu300044 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei106319 Taiwan Center for Condensed Matter Sciences National Taiwan University Taipei10617 Taiwan Center of Atomic Initiative for New Materials National Taiwan University Taipei10617 Taiwan National Center for Theoretical Sciences Taipei10617 Taiwan

This study introduces a novel paradigm for achieving widely tunable many-body Fano quantum interference in low-dimensional semiconducting nanostructures, beyond the conventional requirement of closely matched energy levels between discrete and continuum states observed in atomic Fano systems. Leveraging Floquet engineering, the remarkable tunability of Fano lineshapes is demonstrated, even when the original discrete and continuum states are separated by over 1 eV. Specifically, by controlling the quantum pathways of discrete phonon Raman scattering using femtosecond laser pulses, the Raman intermediate states across the excitonic Floquet band are tuned. This manipulation yields continuous transitions of Fano lineshapes from antiresonance to dispersive and to symmetric Lorentzian profiles, accompanied by significant variations in Fano parameter q and Raman intensity spanning 2 orders of magnitude. A subtle shift in the excitonic Floquet resonance is further shown, achieved by controlling the intensity of the femtosecond laser, which profoundly modifies quantum interference strength from destructive to constructive interference. The study reveals the crucial roles of Floquet engineering in coherent light-matter interactions and opens up new avenues for coherent control of Fano quantum interference over a broad energy spectrum in low-dimensional semiconducting nanostructures. © 2024 The Author(s). Advanced science published by Wiley-VCH GmbH.

关键词： Femtosecond lasers

Terahertz Cavity Phonon Polaritons in Lead Telluride in the Deep-Strong Coupling Regime

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arXiv 2025年

作者： Baydin, Andrey Manjappa, Manukumara Mishra, Sobhan Subhra Xu, Hongjing Doumani, Jacques Tay, Fuyang Kim, Dasom Rappl, Paulo H.O. Abramof, Eduardo Singh, Ranjan Hernandez, Felix G.G. Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Smalley–Curl Institute Rice University HoustonTX77005 United States Rice Advanced Materials Institute Rice University HoustonTX77005 United States Instrumentation and Applied Physics Department Indian Institute of Science Bangalore560012 India Center for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University 639798 Singapore Department of Physics and Astronomy Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley–Curl Institute Rice University HoustonTX77005 United States Group of Research and Development in Materials and Plasma National Institute for Space Research São José dos Campos São Paulo12201-970 Brazil Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 637371 Singapore Instituto de Física Universidade de São Paulo São Paulo05508-090 Brazil Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States

Lead telluride is an important thermoelectric material due to its large Seebeck coefficient combined with its unusually low thermal conductivity that is related to the strong anharmonicity of phonons in this material. Here, we have studied the resonant and nonperturbative coupling of transverse optical phonons in lead telluride with cavity photons inside small-mode-volume metallic metasurface cavities that have photonic modes with terahertz frequencies. We observed a giant vacuum Rabi splitting on the order of the bare phonon and cavity frequencies. Through terahertz time-domain spectroscopy experiments, we systematically studied the vacuum Rabi splitting as a function of sample thickness, temperature, and cavity length. Under the strongest light–matter coupling conditions, the strength of coupling exceeded the bare phonon and cavity frequencies, putting the system into the deep-strong coupling regime. These results demonstrate that this uniquely tunable platform is promising for realizing and understanding predicted cavity-vacuum-induced ferroelectric instabilities and exploring applications of light–matter coupling in the ultrastrong and deep-strong coupling regimes in quantum technology. Copyright © 2025, The Authors. All rights reserved.

关键词： Phonons

Efficiency of Nonthermal Pulsed Emission from Eight MeV Pulsars

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The Astrophysical Journal 2024年第2期965卷 126-126页

作者： J. Takata H.-H. Wang L. C.-C. , Lin S. Kisaka Department of Astronomy School of Physics Huazhong University of Science and Technology Wuhan 430074 People's Republic of China takata@*** School of Physics and Astronomy Sun Yat-sen University Zhuhai 519000 People's Republic of China Department of Physics National Cheng Kung University Tainan 701401 Taiwan Physics Program Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima 739-8526 Japan

We report on the properties of pulsed X-ray emission from eight MeV pulsars using XMM-Newton, NICER, NuSTAR, and HXMT data. For five of the eight MeV pulsars, the X-ray spectra can be fit by a broken power-law model with a break energy of ∼5–10 keV. The photon indices below and above the break energy are ∼1 and ∼1.5, respectively. In comparison with the X-ray emission of the Fermi-LAT pulsars, the MeV pulsars have a harder spectrum and a higher radiation efficiency in the 0.3–10 keV energy bands. When isotropic emission is assumed, the emission efficiency in the keV–MeV bands is estimated to be η_MeV ∼ 0.01–0.1, and this is similar to the efficiency of the GeV emission of the Fermi-LAT pulsars with a similar spin-down power. To explain the observed efficiency of the MeV pulsars, we estimate the required pair multiplicity as 10^4–7, which depends on the emission process (curvature radiation or synchrotron radiation) and on the location in the magnetosphere. The high multiplicity indicates that the secondary pairs that are created by a pair-creation process of the GeV photons produce the X-ray/soft gamma-ray emission of the MeV pulsars. We speculate that the difference between MeV pulsars and Fermi-LAT pulsars can be attributed to the difference in viewing angle measured from the spin axis if the emission originates from a region inside the light cylinder (canonical gap model) or to the difference in the inclination angle of the magnetic axis if the emission is produced in the equatorial current sheet outside the light cylinder.

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