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Entangled radiofrequency-photonic sensor network

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arXiv 2019年

作者： Xia, Yi Li, Wei Clark, William Hart, Darlene Zhuang, Quntao Zhang, Zheshen James C. Wyant College of Optical Sciences University of Arizona TucsonAZ85721 United States Department of Electronic and Information Engineering Shanxi University Taiyuan030013 China Department of Materials Science and Engineering University of Arizona TucsonAZ85721 United States General Dynamics Mission Systems 8220 East Roosevelt Street ScottsdaleAZ85257 United States General Dynamics Mission Systems 9 Vreeland Road Florham ParkNJ07932 United States Department of Electrical and Computer Engineering University of Arizona TucsonAZ85721 United States

Quantum metrology [1–4] enables a measurement sensitivity below the standard quantum limit (SQL), as demonstrated in the Laser Interferometer Gravitational-wave Observatory (LIGO) [5, 6]. As a unique quantum resource, entanglement has been utilized to enhance the performance of, e.g., microscopy [7], target detection [8], and phase estimation [9]. To date, almost all existing entanglement-enhanced sensing demonstrations are restricted to improving the performance of probing optical parameters at a single sensor, but a multitude of applications rely on an array of sensors that work collectively to undertake sensing tasks in the radiofrequency (RF) and microwave spectral ranges. Here, we propose and experimentally demonstrate a reconfigurable RF-photonic sensor network comprised of three entangled sensor nodes. We show that the entanglement shared by the sensors can be tailored to substantially increase the precision of parameter estimation in networked sensing tasks, such as estimating the angle of arrival (AoA) of an RF field. Our work would open a new avenue toward utilizing quantum metrology for ultrasensitive positioning, navigation, and timing. Copyright © 2019, The Authors. All rights reserved.

关键词： Sensor nodes

Giant Valley-Zeeman splitting from spin-singlet and spin-triplet interlayer excitons in WSe2/MoSe2Heterostructure

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arXiv 2019年

作者： Wang, Tianmeng Miao, Shengnan Li, Zhipeng Meng, Yuze Lu, Zhengguang Lian, Zhen Blei, Mark Taniguchi, Takashi Watanabe, Kenji Tongay, Sefaattin Smirnov, Dmitry Shi, Su-Fei Department of Chemical and Biological Engineering Rensselaer Polytechnic Institute TroyNY12180 United States National High Magnetic Field Lab TallahasseeFL32310 United States Department of Physics Florida State University TallahasseeFL32306 United States School for Engineering of Matter Transport and Energy Arizona State University TempeAZ85287 United States National Institute for Materials Science 1-1 Namiki Tsukuba305-0044 Japan Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute TroyNY12180 United States

Transition metal dichalcogenides (TMDCs) heterostructure with a type II alignment hosts unique interlayer excitons with the possibility of spin-triplet and spin-singlet states. However, the associated spectroscopy signatures remain elusive, strongly hindering the understanding of the Moiré potential modulation of the interlayer exciton. In this work, we unambiguously identify the spin-singlet and spin-triplet interlayer excitons in the WSe2/MoSe2hetero-bilayer with a 60-degree twist angle through the gate- A nd magnetic field-dependent photoluminescence spectroscopy. Both the singlet and triplet interlayer excitons show giant valley-Zeeman splitting between the K and K' valleys, a result of the large Landé g-factor of the singlet interlayer exciton and triplet interlayer exciton, which are experimentally determined to be ∼ 10.7 and ∼ 15.2, respectively, in good agreement with theoretical expectation. The PL from the singlet and triplet interlayer excitons show opposite helicities, determined by the atomic registry. Helicity-resolved photoluminescence excitation (PLE) spectroscopy study shows that both singlet and triplet interlayer excitons are highly valley-polarized at the resonant excitation, with the valley polarization of the singlet interlayer exciton approaches unity at ∼ 20 K. The highly valley-polarized singlet and triplet interlayer excitons with giant valley-Zeeman splitting inspire future applications in spintronics and valleytronics. Copyright © 2019, The Authors. All rights reserved.

关键词： Polarization

Uniformity of Multilayer Hexagonal Boron Nitride Dielectric Stacks Grown by Chemical Vapor Deposition on Platinum and Copper Substrates

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Uniformity of Multilayer Hexagonal Boron Nitride Dielectric ...

International Symposium on Physical & Failure Analysis of Integrated Circuits

作者： Fei Hui Xianhu Liang Wenjing Fang Wei Sun Leong Haozhe Wang Hui Ying Yang Yuanyuan Shi Marco A. Villena Jing Kong Mario Lanza Institute of Functional Nano & Soft Materials Soochow University Suzhou China Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge USA Pillar of Engineering Product Development Singapore University of Technology and Design Singapore Department of Materials Science and Engineering Stanford University Stanford California USA

ISBN: (纸本)9781538649305

Large-area multilayer hexagonal boron nitride (h-BN) dielectric stacks can be grown on different metallic substrates by chemical vapor deposition (CVD). The high temperatures used during the growth produce the polycrystallization of the metallic substrates (leading to different crystallographic orientations at the surface of each grain), which may influence the catalytic activity of the CVD process on different grains, as well as the properties of the h-BN stacks grown on them. In this work we compare the uniformity of multilayer h-BN dielectric stacks grown via CVD on two different metallic substrates: Pt and Cu. Our study reveals that using Pt substrates leads to h-BN thickness fluctuations from one Pt grain to another, while this effect remarkably reduced when the h-BN is grown on Cu substrates. Therefore, the use of Cu substrates seems to be more convenient for h-BN production and integration at the wafer level.

关键词： Substrates Boron Dielectrics Nonhomogeneous media Fluctuations Conductivity Chemical vapor deposition

Empty substrate integrated waveguide-fed MMW aperture-coupled patch antenna for 5G applications 12

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Empty substrate integrated waveguide-fed MMW aperture-couple...

12th European Conference on Antennas and Propagation, EuCAP 2018

作者： Khan, Zia Ullah Jilani, Syeda Fizzah Belenguer, Angel Loh, Tian Hong Alomainy, Akram School of Electronic Engineering and Computer Science Queen Mary University of London LondonE1 4NS United Kingdom Departamento de Ingeniería Eléctrica Electrónica Automática y Comunicaciones Universidad de Castilla-La Mancha Spain Engineering Materials and Electrical Science Department National Physical Laboratory TeddingtonTW11 0LW United Kingdom

ISBN: (纸本)9781785617911

This paper introduces a microstrip square patch antenna with a novel low-cost and efficient feeding mechanism for millimetre-wave frequencies targeting at 28 GHz. The radiating patch is excited by the technique of empty substrate integrated waveguide, and two different slot configurations have been examined in this regard. It has been observed that the antenna gain profile and radiation efficiency is significantly improved in both configurations as compared to the microstrip square patch antenna provided with conventional feeding. © Institution of engineering and *** Rights Reserved.

关键词： Millimeter waves

Limits on Broadband Absorption Enhancement in the Presence of Multiple Lossy materials

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arXiv 2018年

作者： Raman, Aaswath Yu, Zongfu Fan, Shanhui Department of Materials Science and Engineering University of California Los AngelesCA90049 United States Department of Electrical and Computer Engineering University of Wisconsin MadisonWI53706 United States Department of Electrical Engineering Ginzton Laboratory Stanford University StanfordCA94305 United States

Enhancing the absorption and emission of electromagnetic waves over a broad range of wavelengths is a topic of fundamental and applied interest in photonics and energy research. In the context of light trapping in solar cells, for example, significant interest in the past decade has focused on overcoming limits in the ray-optics regime with nanophotonic structures. However, many such structures, in particular plasmonic structures, or PT-symmetric systems can posses multiple materials with varying values of intrinsic loss. Here, we rigorously determine the effect of parasitic loss on the achievable absorption enhancement in arbitrary electromagnetic structures. We show that the fundamental limit of broadband absorption enhancement, even in the presence of large parasitic loss in an alternate material, can exceed conventional ray-optics limits on light trapping and absorption enhancement. We numerically verify this behavior by determining the absorption enhancement factor of a canonical system, a metal-insulator-metal waveguide, whose core is a low-index organic semiconductor, in the presence of varying intrinsic loss values in the metal. Copyright © 2018, The Authors. All rights reserved.

关键词： Plasmonics

Near, far, wherever you are: Simulations on the dose efficiency of holographic and ptychographic coherent imaging

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arXiv 2019年

作者： Du, Ming Gürsoy, Dogǎ Jacobsen, Chris Department of Materials Science Northwestern University EvanstonIL60208 United States Advanced Photon Source Argonne National Laboratory ArgonneIL60439 United States Department of Electrical Engineering and Computer Science Northwestern University EvanstonIL60208 United States Department of Physics and Astronomy Northwestern University EvanstonIL60208 United States Chemistry of Life Processes Institute Northwestern University EvanstonIL60208 United States

Different studies in x-ray microscopy have arrived at conicting conclusions about the dose efficiency of imaging modes involving the recording of intensity distributions in the near (Fresnel regime) or far (Fraunhofer regime) field downstream of a specimen. We present here a numerical study on the dose efficiency of near-field holography versus ptychography, a variant of far-field coherent diffraction imaging (CDI) involving multiple overlapping finite illumination positions. Unlike what has been reported for single-illumination CDI, we find that the quality, measured by spatial resolution and mean error, of reconstructed images from ptychography is similar (though slightly better) to what one can obtain from near-field holography at identical uence on the specimen. These results support the concept that, if the experiment and image reconstruction are done properly, the sample can be near, or far;wherever you are, photon uence on the specimen sets one limit to spatial resolution. Copyright © 2019, The Authors. All rights reserved.

关键词： Image resolution

MEMS gyroscope for miniaturized space attitude control system 20

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MEMS gyroscope for miniaturized space attitude control syste...

20th Symposium on Design, Test, Integration and Packaging of MEMS and MOEMS, DTIP 2018

作者： Syed, Wajih U. An, Boo Hyun Mansouri, Mariam S. Mohammed, Zakriya Aldahmani, Sultan Elfadel, Ibrahim Abe M. Choi, Daniel S. Department of Electrical and Computer Engineering Masdar Institute Khalifa University of Science and Technology P.O. Box 54224 Abu Dhabi United Arab Emirates Department of Mechanical and Materials Engineering Masdar Institute at Khalifa University of Science and Technology P.O Box 54224 Abu Dhabi United Arab Emirates United Arab Emirates Space Agency Space Missions' Science and Technology Direct. P.O. Box: 7133 Abu Dhabi United Arab Emirates

ISBN: (纸本)9781538661994

Space applications impose strict requirements on gyroscope design including high accuracy, precision, shock resistance, reduced non-linearity and sensitivity to external factors such as temperature variation. Vibrating ring gyroscopes (VRG) have been shown to achieve a high scale-factor with low non- linearity while their shock resistance can be enhanced with some structural modifications. They also show a good alignment between the drive and sense-mode resonance frequency and with some tuning, the quadrature error can be nearly eliminated thus minimizing device sensitivity on external factors. We have developed a preliminary design of a VRG with C-shaped innerrings for high shock resistance, which we have been evaluating using a simulation workbench that we have developed using Coventor's MEMS+ and Matlab. © 2018 IEEE.

关键词： Space applications

Inverse Design Methods: Inverse Design Strategies for 3D Surfaces Formed by Mechanically Guided Assembly (Adv. Mater. 14/2020)

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Advanced materials 2020年第14期32卷

作者： Zhichao Fan Yiyuan Yang Fan Zhang Zheng Xu Hangbo Zhao Taoyi Wang Honglie Song Yonggang Huang John A. Rogers Yihui Zhang Applied Mechanics Laboratory Department of Engineering Mechanics Center for Flexible Electronics Technology Tsinghua University Beijing 100084 P. R. China Departments of Mechanical Engineering Northwestern University Evanston IL 60208 USA The State Key Laboratory for Manufacturing and Systems Engineering School of Mechanical Engineering Xi'an Jiaotong University Xi'an 710049 P. R. China Center for Bio‐Integrated Electronics Northwestern University Evanston IL 60208 USA Department of Physics Tsinghua University Beijing 100084 P. R. China Departments of Civil and Environmental Engineering Mechanical Engineering and Materials Science and Engineering Center for Bio‐Integrated Electronics Northwestern University Evanston IL 60208 USA Department of Materials Science and Engineering Biomedical Engineering Neurological Surgery Chemistry Mechanical Engineering Electrical Engineering and Computer Science Simpson Querrey Institute and Feinberg Medical School Center for Bio‐Integrated Electronics Northwestern University Evanston IL 60208 USA

Measurement of the Higgs boson production via vector boson fusion and its decay into bottom quarks in proton-proton collisions at s = 13 TeV

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Journal of High Energy Physics 2024年第1期2024卷 173页

作者： Hayrapetyan, A. Tumasyan, A. Adam, W. Andrejkovic, J.W. Bergauer, T. Chatterjee, S. Damanakis, K. Dragicevic, M. Escalante Del Valle, A. Hussain, P.S. Jeitler, M. Krammer, N. Lechner, L. Liko, D. Mikulec, I. Schieck, J. Schöfbeck, R. Schwarz, D. Sonawane, M. Templ, S. Waltenberger, W. Wulz, C.-E. Darwish, M.R. Janssen, T. Kello, T. Van Mechelen, P. Bols, E.S. D’Hondt, J. Dansana, S. De Moor, A. Delcourt, M. El Faham, H. Lowette, S. Makarenko, I. Morton, A. Müller, D. Sahasransu, A.R. Tavernier, S. Tytgat, M. Van Putte, S. Vannerom, D. Clerbaux, B. De Lentdecker, G. Favart, L. Hohov, D. Jaramillo, J. Khalilzadeh, A. Lee, K. Mahdavikhorrami, M. Malara, A. Paredes, S. Pétré, L. Postiau, N. Thomas, L. Vanden Bemden, M. Vander Velde, C. Vanlaer, P. De Coen, M. Dobur, D. Knolle, J. Lambrecht, L. Mestdach, G. Rendón, C. Samalan, A. Skovpen, K. Van Den Bossche, N. Vermassen, B. Wezenbeek, L. Benecke, A. Bruno, G. Bury, F. Caputo, C. Delaere, C. Donertas, I.S. Giammanco, A. Jaffel, K. Jain, Sa. Lemaitre, V. Lidrych, J. Mastrapasqua, P. Mondal, K. Tran, T.T. Wertz, S. Alves, G.A. Coelho, E. Hensel, C. Moraes, A. Rebello Teles, P. Aldá Júnior, W.L. Alves Gallo Pereira, M. Barroso Ferreira Filho, M. Brandao Malbouisson, H. Carvalho, W. Chinellato, J. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. Fonseca De Souza, S. Martins, J. Mora Herrera, C. Mota Amarilo, K. Mundim, L. Nogima, H. Santoro, A. Silva Do Amaral, S.M. Sznajder, A. Thiel, M. Vilela Pereira, A. Bernardes, C.A. Calligaris, L. Fernandez Perez Tomei, T.R. Gregores, E.M. Mercadante, P.G. Novaes, S.F. Orzari, B. Padula, Sandra S. Aleksandrov, A. Antchev, G. Hadjiiska, R. Iaydjiev, P. Misheva, M. Shopova, M. Sultanov, G. Dimitrov, A. Ivanov, T. Litov, L. Pavlov, B. Petkov, P. Petrov, A. Shumka, E. Keshri, S. Thakur, S. Cheng, T. Guo, Q. Javaid, T. Mittal, M. Yuan, L. Bauer, G. Hu, Z. Yi, K. Chen, G.M. Chen, H.S. Chen, M. Iemmi, F. Jiang, C.H. Kapoor, A. Liao, H. Liu, Z.-A. Monti, F. Sharma, R. Song, J.N. Tao, J. Wang, J. Zhang, H. Agapitos, A. Ban, Y. Levin, A. Yerevan Physics Institute Yerevan Armenia Institut für Hochenergiephysik Vienna Austria Universiteit Antwerpen Antwerpen Belgium Vrije Universiteit Brussel Brussel Belgium Université Libre de Bruxelles Bruxelles Belgium Ghent University Ghent Belgium Université Catholique de Louvain Louvain-la-Neuve Belgium Centro Brasileiro de Pesquisas Fisicas Rio de Janeiro Brazil Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil Universidade Estadual Paulista Universidade Federal do ABC São Paulo Brazil Institute for Nuclear Research and Nuclear Energy Bulgarian Academy of Sciences Sofia Bulgaria University of Sofia Sofia Bulgaria Instituto De Alta Investigación Universidad de Tarapacá Casilla 7 D Arica Chile Beihang University Beijing China Department of Physics Tsinghua University Beijing China Institute of High Energy Physics Beijing China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China Sun Yat-Sen University Guangzhou China University of Science and Technology of China Hefei China Institute of Modern Physics and Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) — Fudan University Shanghai China Zhejiang University Zhejiang Hangzhou China Universidad de Los Andes Bogota Colombia Universidad de Antioquia Medellin Colombia University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Split Croatia University of Split Faculty of Science Split Croatia Institute Rudjer Boskovic Zagreb Croatia University of Cyprus Nicosia Cyprus Charles University Prague Czech Republic Escuela Politecnica Nacional Quito Ecuador Universidad San Francisco de Quito Quito Ecuador Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics Cairo Egypt Center for High Energy Physics (CHEP-FU) Fayoum University El-Fayoum Egypt National Institute of Chemical Physics and Biophysics Tallinn Estonia Department of Physics

A measurement of the Higgs boson (H) production via vector boson fusion (VBF) and its decay into a bottom quark-antiquark pair (bb¯) is presented using proton-proton collision data recorded by the CMS experiment at s = 13 TeV and corresponding to an integrated luminosity of 90.8 fb⁻¹. Treating the gluon-gluon fusion process as a background and constraining its rate to the value expected in the standard model (SM) within uncertainties, the signal strength of the VBF process, defined as the ratio of the observed signal rate to that predicted by the SM, is measured to be μ_Hbb¯^qqh=1.01_−0.46^+0.55. The VBF signal is observed with a significance of 2.4 standard deviations relative to the background prediction, while the expected significance is 2.7 standard deviations. Considering inclusive Higgs boson production and decay into bottom quarks, the signal strength is measured to be μ_Hbb¯^incl.=0.99_−0.41^+0.48, corresponding to an observed (expected) significance of 2.6 (2.9) standard deviations. © The Author(s) 2024.

关键词： B Physics Hadron-Hadron Scattering Higgs Physics