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Polar Polarization Mode and Average Radical Flux Intensity Measurements Based on All Optical Spatial Communication Systems

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Journal of Optical Communications 2019年第s1期45卷 s53-s61页

作者： Amiri, I.S. Rashed, Ahmed Nabih Zaki Jahan, Sohely Paul, Bikash Kumar Ahmed, Kawsar Computational Optics Research Group Advanced Institute of Materials Science Ton Duc Thang University Ho Chi Minh City700000 Viet Nam Faculty of Applied Sciences Ton Duc Thang University Ho Chi Minh City Viet Nam Faculty of Electronic Engineering Electronics and Electrical Communications Engineering Department Menoufia University Menouf Menoufia32951 Egypt Department of Computer Science and Engineering University of Barisal Kornokathi Barisal8200 Bangladesh Ashulia Savar1342 Bangladesh Department of Information and Communication Technology Mawlana Bhashani Science and Technology University Santosh Tangail1902 Bangladesh Group of Bio-photomatiχ Mawlana Bhashani Science and Technology University Santosh Tangail1902 Bangladesh

This study presents the polar polarization mode and average radical intensity flux distribution measurements based on all optical spatial communication systems. The numerical technique that is applied with the simulation model is the diffraction fast Fourier integral transform. Spatial optical sources are used such as continuous wave (CW) laser and vertical cavity surface-emitting laser (VCSEL) with spatial connector and spatial aperture. Spatial temporal polarization effects are taken into account. Percentage encircled flux/average flux radical intensity and polar radical polarization are measured with spatial connector distance and spatial aperture width. The encircled flux is constant at 95% of its value in the case of VCSEL laser source at a radical distance of exactly 10 μm. However, the encircled flux is constant at 92 %of its value in the case of CW laser source at a radical distance of exactly 6 μm. It is noticed that the encircled flux increases with increasing radial distance of spatial apertures that are used with two suggested light sources. The encircled flux is constant at 93 % of its value in the case of VCSEL laser source at a radical distance of exactly 10 μm. © 2019 Walter de Gruyter GmbH, Berlin/Boston.

关键词： Surface emitting lasers

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A Reliable Double-Sided 1200-V/600-A Multichip Half-bridge Insulated Gate Bipolar Transistor (IGBT) Module with High Power Density

A Reliable Double-Sided 1200-V/600-A Multichip Half-bridge I...

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Workshop on Wide Bandgap Power Devices and Applications in Asia (WiPDA Asia)

作者： Zheng Wang Yunhui Mei Wen Liu Yijing Xie Shancan Fu Xin Li Guo-Quan Lu Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and Engineering Tianjin University Tianjin China Department of Materials Science and Engineering and the Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

ISBN: (纸本)9781538643938

A double-sided 1200-V/600-A multichip half-bridge insulated gate bipolar transistor (IGBT) module is successfully fabricated utilizing nanosilver paste as die attachment. The module consists of eight IGBT chips and eight diodes with extremely high power density. The dimension of this module is only 70 mm $\times 59$ mm $\times 3.48$ mm with a maximum power density as high as 5. $01 \times 10^{4} \mathrm{k}\mathrm{W}/\mathrm{L}$, which is more than 9 times higher than the power density of a commercial wire-bonding one. Thermal properties and electrical properties of the double-sided module are also characterized. In order to use the module with such high power density, double-sided cooling is suggested. No degradation of the power devices proved that the way to double-sided packaging power devices could be used for future manufacturing of high power density power module.

关键词： Insulated gate bipolar transistors Density measurement Power system measurements Inductance Substrates Heating systems Packaging

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Simultaneous optical and electrical Spin-torque magnetometry with stroboscopic detection of spin-precession phase

arXiv

引用

arXiv 2019年

作者： Li, Yi Saglam, Hilal Zhang, Zhizhi Bidthanapally, Rao Xiong, Yuzan Pearson, John E. Novosad, Valentine Qu, Hongwei Srinivasan, Gopalan Hoffmann, Axel Zhang, Wei Department of Physics Oakland University RochesterMI48309 United States Materials Science Division Argonne National Laboratory ArgonneIL60439 United States Department of Physics Illinois Institute of Technology ChicagoIL60616 United States School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan430074 China Department of Electrical and Computer Engineering Oakland University RochesterMI48309 United States

Spin-based coherent information processing and encoding utilize the precession phase of spins in magnetic materials. However, the detection and manipulation of spin precession phases remain a major challenge for advanced spintronic functionalities. By using simultaneous electrical and optical detection, we demonstrate the direct measurement of the precession phase of Permalloy ferromagnetic resonance driven by the spin-orbit torques from adjacent heavy metals. The spin Hall angle of the heavy metals can be independently determined from concurrent electrical and optical signals. The stroboscopic optical detection also allows spatially measuring local spin-torque parameters and the induced ferromagnetic resonance with comprehensive amplitude and phase information. Our study offers a route towards future advanced characterizations of spin-torque oscillators, magnonic circuits, and tunnelling junctions, where measuring the current-induced spin dynamics of individual nanomagnets are required. Copyright © 2019, The Authors. All rights reserved.

关键词： Ferromagnetic resonance

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Random lasing in an Anderson localizing optical fiber

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Light(science & Applications) 2017年第1期6卷 577-584页

作者： Behnam Abaie Esmaeil Mobini Salman Karbasi Thomas Hawkins John Ballato Arash Mafi Department of Physics and Astronomy University of New MexicoAlbuquerqueNM 87131USA Center for High Technology Materials University of New MexicoAlbuquerqueNM 87106USA Department of Electrical and Computer Engineering University of CaliforniaSan DiegoCA 92093USA Center for Optical Materials Science and Engineering Technologies(COMSET)and the Department of Materials Science and Engineering Clemson UniversityClemsonSC 29625USA

A directional random laser mediated by transverse Anderson localization in a disordered glass optical fiber is *** demonstrations of random lasers have found limited applications because of their multi-directionality and chaotic fluctuations in the laser *** random laser presented in this paper operates in the Anderson localization *** disorder induced localized states form isolated local channels that make the output laser beam highly directional and stabilize its *** strong transverse disorder and longitudinal invariance result in isolated lasing modes with negligible interaction with their surroundings,traveling back and forth in a Fabry–Perot cavity formed by the air–fiber *** is shown that if a localized input pump is scanned across the disordered fiber input facet,the output laser signal follows the transverse position of the ***,a uniformly distributed pump across the input facet of the disordered fiber generates a laser signal with very low spatial coherence that can be of practical importance in many optical platforms including image transport with fiber bundles.

关键词： disordered optical fiber random lasing transverse Anderson localization

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Lithium Battery Cathodes: Concurrently Approaching Volumetric and Specific Capacity Limits of Lithium Battery Cathodes via Conformal Pickering Emulsion Graphene Coatings (Adv. Energy Mater. 25/2020)

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Advanced Energy materials 2020年第25期10卷

作者： Kyu‐Young Park Jin‐Myoung Lim Norman S. Luu Julia R. Downing Shay G. Wallace Lindsay E. Chaney Hocheon Yoo Woo Jin Hyun Hyeong‐U Kim Mark C. Hersam Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA SKKU Advanced Institute of Nanotechnology Sungkyunkwan University (SKKU) Suwon Gyeonggi‐do 16419 Korea Department of Chemistry Northwestern University Evanston IL 60208 USA Department of Electrical and Computer Engineering Northwestern University Evanston IL 60208 USA

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Autonomous efficient experiment design for materials discovery with Bayesian model averaging

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Physical Review materials 2018年第11期2卷 113803-113803页

作者： Anjana Talapatra S. Boluki T. Duong X. Qian E. Dougherty R. Arróyave Department of Materials Science & Engineering Texas A & M University College Station Texas 77843 USA Department of Electrical and Computer Engineering Texas A & M University College Station Texas 77843 USA Department of Mechanical Engineering Texas A & M University College Station Texas 77843 USA

The accelerated exploration of the materials space in order to identify configurations with optimal properties is an ongoing challenge. Current paradigms are typically centered around the idea of performing this exploration through high-throughput experimentation/computation. Such approaches, however, do not account for—the always present—constraints in resources available. Recently this problem has been addressed by framing materials discovery as an optimal experiment design. This work augments earlier efforts by putting forward a framework that efficiently explores the materials design space not only accounting for resource constraints but also incorporating the notion of model uncertainty. The resulting approach combines Bayesian model averaging within Bayesian optimization in order to realize a system capable of autonomously and adaptively learning not only the most promising regions in the materials space but also the models that most efficiently guide such exploration. The framework is demonstrated by efficiently exploring the MAX ternary carbide/nitride space through density functional theory (DFT) calculations.

关键词： Mechanical & acoustical properties Density functional theory High-throughput calculations Machine learning Numerical techniques

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Tuning Two-Dimensional Hyperbolic Plasmons in Black Phosphorus

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Physical Review Applied 2019年第1期12卷 014011-014011页

作者： Edo van Veen Andrei Nemilentsau Anshuman Kumar Rafael Roldán Mikhail I. Katsnelson Tony Low Shengjun Yuan Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology Wuhan University Wuhan China Institute for Molecules and Materials Radboud University Heyendaalseweg 135 6525AJ Nijmegen Netherlands Department of Electrical and Computer Engineering University of Minnesota Minneapolis Minnesota 55455 USA Physics Department Indian Institute of Technology Bombay Mumbai 400076 India Materials Science Factory Instituto de Ciencia de Materiales de Madrid (ICMM) Consejo Superior de Investigaciones Científicas (CSIC) Cantoblanco E28049 Madrid Spain

Black phosphorus presents a very anisotropic crystal structure, making it a potential candidate for hyperbolic plasmonics, characterized by a permittivity tensor where one of the principal components is metallic and the other dielectric. Here we demonstrate that atomically thin black phosphorus can be engineered to be a hyperbolic material operating in a broad range of the electromagnetic spectrum from the entire visible spectrum to ultraviolet. With the introduction of an optical gain, a new hyperbolic region emerges in the infrared. The character of this hyperbolic plasmon depends on the interplay between gain and loss along the two crystalline directions.

关键词： Hyperbolic metamaterials Nanophotonics Optical conductivity Optoelectronics Plasmonics Strain Phosphorene Tight-binding model

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Thermal conductance across harmonic-matched epitaxial al-sapphire heterointerfaces

arXiv

引用

arXiv 2019年

作者： Cheng, Zhe Koh, Yee Rui Ahmad, Habib Hu, Renjiu Shi, Jingjing Liao, Michael E. Wang, Yekan Bai, Tingyu Li, Ruiyang Lee, Eungkyu Clinton, Evan A. Matthews, Christopher M. Engel, Zachary Yates, Luke Luo, Tengfei Goorsky, Mark S. Doolittle, William Tian, Zhiting Hopkins, Patrick E. Graham, Samuel George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology AtlantaGA30332 United States Department of Mechanical and Aerospace Engineering University of Virginia CharlottesvilleVA22904 United States School of Electrical and Computer Engineering Georgia Institute of Technology AtlantaGA30332 United States Sibley School of Mechanical and Aerospace Engineering Cornell University IthacaNY14853 United States Materials Science and Engineering University of California Los Angeles Los AngelesCA91355 United States Department of Aerospace and Mechanical Engineering University of Notre Dame Notre DameIN46556 United States University of Notre Dame Notre DameIN46556 United States Department of Materials Science and Engineering University of Virginia CharlottesvilleVA22904 United States Department of Physics University of Virginia CharlottesvilleVA22904 United States School of Materials Science and Engineering Georgia Institute of Technology AtlantaGA30332 United States

A unified fundamental understanding of interfacial thermal transport is missing due to the complicated nature of interfaces which involves complex factors such as interfacial bonding and mixing, surface chemistry, crystal orientation, roughness, and interfacial disorder. This is especially true for metal-nonmetal interfaces which incorporate multiple fundamental heat transport mechanisms such as elastic and inelastic phonon scattering as well as electron-phonon coupling in the metal and across the interface. All these factors jointly affect thermal boundary conductance (TBC). Therefore, the experimentally measured interfaces may not be the same as the ideally modelled, thus obfuscating conclusions drawn from previous experimental and modeling comparisons. This work provides a systematic study of interfacial thermal conductance across well-controlled and ultraclean epitaxial (111) Al || (0001) sapphire interfaces, known as harmonic-matched interface. The measured high TBC is compared with theoretical models of atomistic Green’s function (AGF) and the non-equilibrium Landauer approach, showing that elastic phonon transport dominates the interfacial thermal transport of the Al-sapphire interfaces. By scaling the TBC with the Al heat capacity and sapphire heat capacity with phonon frequency lower than the max Al phonon frequency, a nearly constant transmission coefficient is observed, indicating that the phonons on the Al side limits the Al-sapphire TBC. This confirms that elastic phonon transport dominates interfacial thermal transport of the Al-sapphire interfaces and other mechanisms play negligible roles. Our work enables a quantitative study of TBC to validate theoretical models of thermal transport mechanisms across metal-nonmetal interfaces, and acts as a benchmark when studying how other factors impact TBC. Copyright © 2019, The Authors. All rights reserved.

关键词： Chemical bonds

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Author Correction: Greengenes2 unifies microbial data in a single reference tree

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Nature biotechnology 2024年第5期42卷 813页

作者： Daniel McDonald Yueyu Jiang Metin Balaban Kalen Cantrell Qiyun Zhu Antonio Gonzalez James T Morton Giorgia Nicolaou Donovan H Parks Søren M Karst Mads Albertsen Philip Hugenholtz Todd DeSantis Se Jin Song Andrew Bartko Aki S Havulinna Pekka Jousilahti Susan Cheng Michael Inouye Teemu Niiranen Mohit Jain Veikko Salomaa Leo Lahti Siavash Mirarab Rob Knight Department of Pediatrics University of California San Diego School of Medicine La Jolla CA USA. Department of Electrical and Computer Engineering University of California San Diego La Jolla CA USA. Bioinformatics and Systems Biology Program University of California San Diego La Jolla CA USA. Department of Computer Science and Engineering University of California San Diego La Jolla CA USA. School of Life Sciences Arizona State University Tempe AZ USA. Biodesign Center for Fundamental and Applied Microbiomics Arizona State University Tempe AZ USA. Biostatistics & Bioinformatics Branch Eunice Kennedy Shriver National Institute of Child Health and Human Development National Institutes of Health Bethesda MD USA. Halicioglu Data Science Institute University of California San Diego La Jolla CA USA. Australian Centre for Ecogenomics School of Chemistry and Molecular Biosciences The University of Queensland St Lucia Queensland Australia. Department of Obstetrics and Gynecology Columbia University New York NY USA. Department of Chemistry and Bioscience Aalborg University Aalborg Denmark. Department of Informatics Second Genome Brisbane CA USA. Center for Microbiome Innovation Jacobs School of Engineering University of California San Diego La Jolla CA USA. Finnish Institute for Health and Welfare Helsinki Finland. Institute for Molecular Medicine Finland FIMM-HiLIFE Helsinki Finland. Division of Cardiology Brigham and Women's Hospital Boston MA USA. Cedars-Sinai Medical Center Los Angeles CA USA. Cambridge Baker Systems Genomics Initiative Baker Heart and Diabetes Institute Melbourne Victoria Australia. Cambridge Baker Systems Genomics Initiative Department of Public Health and Primary Care University of Cambridge Cambridge UK. Division of Medicine Turku University Hospital and University of Turku Turku Finland. Sapient Bioanalytics LLC San Diego CA USA. Department of Computing University of Turku Turku Finland. Department of Pediatrics Uni

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Photoluminescence mapping and time-domain thermo-photoluminescence for rapid imaging and measurement of thermal conductivity of boron arsenide

arXiv

引用

arXiv 2019年

作者： Yue, Shuai Gamage, Geethal Amila Mohebinia, Mohammadjavad Mayerich, David Talari, Vishal Deng, Yu Tian, Fei Dai, Shen-Yu Sun, Haoran Hadjiev, Viktor G. Zhang, Wei Feng, Guoying Hu, Jonathan Liu, Dong Wang, Zhiming Ren, Zhifeng Bao, Jiming Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu Sichuan610054 China Department of Electronic and Computer Engineering University of Houston HoustonTX77204 United States Department of Physics Texas Center for Superconductivity University of Houston HoustonTX77204 United States Materials Science & Engineering University of Houston HoustonTX77204 United States Department of Mechanical Engineering University of Houston HoustonTX77204 United States College of Electronics & Information Engineering Sichuan University Chengdu Sichuan610064 China Texas Center for Superconductivity University of Houston HoustonTX77204 United States Department of Electrical and Computer Engineering Baylor University WacoTX76798 United States

Cubic boron arsenide (BAs) is attracting greater attention due to the recent experimental demonstration of ultrahigh thermal conductivity K above 1000 W/m·K. However, its bandgap has not been settled and a simple yet effective method to probe its crystal quality is missing. Furthermore, traditional K measurement methods are destructive and time consuming, thus they cannot meet the urgent demand for fast screening of high K materials. After we experimentally established 1.82 eV as the indirect bandgap of BAs and observed room-temperature band-edge photoluminescence, we developed two new optical techniques that can provide rapid and non-destructive characterization of K with little sample preparation: photoluminescence mapping (PL-mapping) and time-domain thermo-photoluminescence (TDTP). PL-mapping provides nearly real-time image of crystal quality and K over mm-sized crystal surfaces;while TDTP allows us to pick up any spot on the sample surface and measure its K using nanosecond laser pulses. These new techniques reveal that the apparent single crystals are not only non-uniform in K, but also are made of domains of very distinct K. Because PL-mapping and TDTP are based on the band-edge PL and its dependence on temperature, they can be applied to other semiconductors, thus paving the way for rapid identification and development of high-K semiconducting materials. Copyright © 2019, The Authors. All rights reserved.

关键词： Photoluminescence

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