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Advanced Solid State Lasers, ASSL 2018

作者： Ho, V.X. Al Tahtamouni, T.M. Wang, Y. Jiang, H.X. Lin, J.Y. Zavada, J.M. Vinh, N.Q. Department of Physics Center for Soft Matter and Biological Physics Virginia Tech BlacksburgVA24061 United States Materials Science and Technology Program College of Arts and Sciences Qatar University Doha2713 Qatar Department of Electrical and Computer Engineering Texas Tech University LubbockTX79409 United States Department of Electrical and Computer Engineering New York University BrooklynNY11201 United States

We report the realization of room-temperature, stimulated-emission in Er-doped-GaN multiple-quantum-wells at the 1.5-µm. Structures were grown by MOCVD and lasing was confirmed by threshold-behaviors of emission-... 详细信息

ISBN: (纸本)9781943580484

关键词： Semiconductor quantum wells

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Low-cost,μm-thick,tape-free electronic tattoo sensors with minimized motion and sweat artifacts

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npj Flexible Electronics 2018年第1期2卷 35-41页

作者： Youhua Wang Yitao Qiu Shideh Kabiri Ameri Hongwoo Jang Zhaohe Dai YongAn Huang Nanshu Lu Center for Mechanics of Solids Structures and MaterialsDepartment of Aerospace Engineering and Engineering MechanicsThe University of Texas at AustinAustinTX 78712USA State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhanChina Flexible Electronics Research Center Huazhong University of Science and TechnologyWuhanChina Deparment of Electrical and Computer Engineering The University of Texas at AustinAustinTXUSA Texas Materials Institute The University of Texas at AustinAustinTXUSA Department of Biomedical Engineering The University of Texas at AustinAustinTXUSA Present address:Department of Civil&Environmental Engineering Stanford UniversityStanfordCA 94305USA

Electronic tattoos(e-tattoos),also known as epidermal electronics,are ultra-thin and ultra-soft noninvasive but skin-conformable devices with capabilities including physiological sensing and transdermal stimulation and *** fabrication of e-tattoos out of conventional inorganic electronic materials used to be tedious and *** developed cut-and-paste method has significantly simplified the process and lowered the ***,existing cut-and-paste method entails a medical tape on which the electronic tattoo sensors should be pasted,which increases tattoo thickness and degrades its *** address this problem,here we report a slightly modified cut-and-paste method to fabricate low-cost,open-mesh e-tattoos with a total thickness of just 1.5μm.E-tattoos of such thinness can be directly pasted on human skin and conforms to natural skin *** demonstrate that this ultra-thin,tape-free e-tattoo can confidently measure electrocardiogram(ECG),skin temperature,and skin *** rate and even respiratory rate can be extracted from the ECG signals.A special advantage of such ultra-thin e-tattoo is that it is capable of high-fidelity sensing with minimized motion artifacts under various body *** of perspiration are found to be insignificant due to the breathability of such e-tattoos.

关键词： paste cost electronic

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Boosting the Performance of MOEA/D-DRA with a Multi-Objective Hyper-Heuristic Based on Irace and UCB Method for Heuristic Selection

Boosting the Performance of MOEA/D-DRA with a Multi-Objectiv...

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Congress on Evolutionary Computation

作者： Lucas Prestes Myriam R. Delgado Ricardo Lüders Richard Gonçalves Carolina P. Almeida Graduate Program in Electrical and Computer Engineering UTFPR Computer Science Department UNICENTRO

Multi-Objective Evolutionary Algorithm based on Decomposition with Dynamical Resource Allocation (MOEA/D-DRA) is one of the most successful decomposition based multiobjective algorithm. Its main feature is a mechanism to allocate different computational effort proportional to the difficult of each subproblem. Despite its success, MOEA/D-DRA has a large set of parameters and operators, whose selection could be a difficult task. This paper aims at improving the performance of MOEA/D-DRA by means of a hyper-heuristic using two parameter/operator selection phases: one off-line strongly based on Iterated Race Automatic Algorithm Configuration (Irace) and another one (online) based on the Upper Confidence Bound (UCB) technique. The proposed approach is compared with the original MOEA/D-DRA, NSGAII and IBEA over 51 instances of 7 well known benchmarks (CEC 2009, GLT, LZ09, MOP, DTLZ, ZDT and WFG). Results show that Irace and UCB are interesting methods to support the hyper-heuristic functioning when selecting parameters/operators of MOEA/D-DRA in the addressed problems.

关键词： Optimization Evolutionary computation Resource management Sociology Statistics Tuning Task analysis

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Low-cost open-source voltage and current monitor for gas metal arc weld 3D printing

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Rivista Italiana della Saldatura 2017年第1期69卷 73-84页

作者： Pinar, A. Wijnen, B. Anzalone, G.C. Hanvens, T.C. Sanders, P.G. Pearce, J.M. Michigan Technological University Department of Electrical and Computer Engineering HoughtonMI United States Michigan Technological University Department of Materials Science and Engineering HoughtonMI United States Michigan Technological University Department of Electrical and Computer Engineering Department of Computer Science HoughtonMI United States Michigan Technological University Department of Electrical and Computer Engineering Department of Materials Science and Engineering HoughtonMI United States

Arduino open-source microcontrollers are well known in sensor applications for scientific equipment and for controlling RepRap 3D printers. Recently low-cost open-source gas metal arc weld (GMAW) RepRap 3D printers have been developed. The entry-level welders used have minimal controls and therefore lack any real-time measurement of welder voltage or current. The preliminary work on process optimization of GMAW 3D printers requires a low-cost sensor and data logger system to measure welder current and voltage. This paper reports on the development of a low-cost open-source power measurement sensor system based on Arduino architecture. The sensor system was designed, built, and tested with two entry-level MIG welders. The full bill of materials and open source designs are provided. Voltage and current were measured while making stepwise adjustments to the manual voltage setting on the welder. Three conditions were tested while welding with steel and aluminum wire on steel substrates to assess the role of electrode material, shield gas, and welding velocity. The results showed that the open source sensor circuit performed as designed and could be constructed for Copyright © IIW 2016: all rights reserved.

关键词： 3D printers

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Metal/BaTiO3/β-Ga2O3dielectric heterojunction diode with 5.7 MV/cm breakdown field

arXiv

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arXiv 2019年

作者： Xia, Zhanbo Chandrasekar, Hareesh Moore, Wyatt Wang, Caiyu Lee, Aidan McGlone, Joe Kalarickal, Nidhin Kurian Arehart, Aaron Ringel, Steven Yang, Fengyuan Rajan, Siddharth Electrical & Computer Engineering Ohio State University ColumbusOH43210 United States Materials Science and Engineering Ohio State University ColumbusOH43210 United States Department of Physics Ohio State University ColumbusOH43210 United States

Wide and ultra-wide band gap semiconductors can provide excellent performance due to their high energy band gap, which leads to breakdown electric fields that are more than an order of magnitude higher than conventional silicon electronics. In materials where p-type doping is not available, achieving this high breakdown field in a vertical diode or transistor is very challenging. We propose and demonstrate the use of dielectric heterojunctions that use extreme permittivity materials to achieve high breakdown field in a unipolar device. We demonstrate the integration of a high permittivity material BaTiO3with n-type β-Ga2O3to enable 5.7 MV/cm average electric field and 7 MV/cm peak electric field at the device edge, while maintaining forward conduction with relatively low on-resistance and voltage loss. The proposed dielectric heterojunction could enable new design strategies to achieve theoretical device performance limits in wide and ultrawide band gap semiconductors where bipolar doping is challenging. Copyright © 2019, The Authors. All rights reserved.

关键词： Dielectric materials

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Collective near-field coupling in infrared-phononic metasurfaces for nano-light canalization

arXiv

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arXiv 2020年

作者： Li, Peining Hu, Guangwei Dolado, Irene Tymchenko, Mykhailo Qiu, Cheng-Wei Alfaro-Mozaz, Francisco Javier Casanova, Felix Hueso, Luis E. Liu, Song Edgar, James H. Vélez, Saül Alu, Andrea Hillenbrand, Rainer Wuhan National Laboratory for Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan430074 China CIC nanoGUNE BRTA Donostia-San Sebastián20018 Spain Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore117583 Singapore Advanced Science Research Center City University of New York New York10031 United States IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Tim Taylor Dept. of Chemical Engineering Kansas State University ManhattanKS66506 United States Department of Materials ETH Zürich Zürich8093 Switzerland CIC NanoGUNE BRTA UPV EHU Donostia-San Sebastián20018 Spain

Polaritons - coupled excitations of photons and dipolar matter excitations - can propagate along anisotropic metasurfaces with either hyperbolic or elliptical dispersion. At the transition from hyperbolic to elliptical dispersion (corresponding to a topological transition), various intriguing phenomena are found, such as an enhancement of the photonic density of states, polariton canalization and hyperlensing. Here we investigate theoretically and experimentally the topological transition and the polaritonic coupling of deeply subwavelength elements (structure sizes ∼ λ/100, λ being the free-space wavelength) in a uniaxial infrared-phononic metasurface, a grating of hexagonal boron nitride (hBN) nanoribbons. By hyperspectral infrared nanoimaging, we observe, for the first time, a synthetic transverse optical phonon resonance (that is, the strong collective near-field coupling of the nanoribbons) in the middle of the hBN Reststrahlen band, yielding a topological transition from hyperbolic to elliptical dispersion. We further visualize and characterize the spatial evolution of a deeply subwavelength canalization mode (a spatial confinement of about 300 nm, ∼ λ/22) near the transition frequency, which is a collimated polariton that is the basis for hyperlensing and diffraction-less propagation. Our results provide fundamental insights into the role of polaritonic near-field coupling in metasurfaces for creating topological transitions and polariton canalization. Copyright © 2020, The Authors. All rights reserved.

关键词： Photons

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Open-source matlab-based graphical user interface (gui) for computer control of microscopes using μmanager

arXiv

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arXiv 2019年

作者： Pham, Quang Long Chege, David Dijamco, Timothy Surblyte, Migle Naik, Akshay Campbell, Kolawole Tong, Nhat-Anh-Nguyen Voronov, Roman Otto H. York Department of Chemical and Materials Engineering Newark College of Engineering New Jersey Institute of Technology NewarkNJ07102 United States Department of Electrical and Computer Engineering Newark College of Engineering New Jersey Institute of Technology NewarkNJ07102 United States Department of Computer Science Ying Wu College of Computing New Jersey Institute of Technology NewarkNJ07102 United States

Live time-lapse microscopy is essential for a wide range of biological applications. Software-based automation is the gold standard for the operation of hardware accessories necessary for image acquisition. Given that current software packages are neither affordable nor open to complex structured programming, we have developed a Matlab-based graphical user interface (GUI) that is fundamentally accessible while providing limitless avenues for further customization. The GUI simultaneously communicates with the open-source, cross-functional platform -ÝManager for controlling hardware for time-lapse image acquisition and with other software for image processing. The use of the GUI is demonstrated through an 18-hour cell migration experiment. The results suggest that the GUI can generate high-quality, high-throughput time-lapse images. The core code behind the GUI is open-source so that it can be modified and upgraded. Therefore, it benefits the researchers worldwide by providing them a fundamental yet functional template to add in advanced features specific to their needs, such as additional non-microscopy hardware parts and software packages supported by the Matlab software. Copyright © 2019, The Authors. All rights reserved.

关键词： MATLAB

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Broadband Scanning Microwave Microscopy of a Biological Cell with Unprecedented Image Quality and Signal-to-Noise Ratio

Broadband Scanning Microwave Microscopy of a Biological Cell...

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Microwave, MTT-S International Symposium

作者： Xin Jin Marco Farina Xiaopeng Wang Gianluca Fabi Xuanhong Cheng James C. M. Hwang Department of Electrical and Computer Engineering Lehigh University Bethlehem PA USA Dipartimento di Ingegneria dell’Informazione Università Politecnica delle Marche Ancona Italy Dept. of Materials Science and Engineering and Dept. of Bioengineering Lehigh University PA USA

A broadband scanning microwave microscope (SMM) was developed by modifying both the hardware and software of a narrowband commercial SMM. Using the broadband SMM, images of a Jurkat human lymphocyte cell were acquired over 128 × 128 pixels at 201 frequencies from 1 GHz to 9 GHz, all in 20 min. The acquired broadband signals allowed Fourier transformation for time-gated postprocessing of the SMM data with unprecedented image quality and signal-to-noise ratio. The broadband SMM can enable microwave spectroscopy and 3D tomography of intracellular structures in a live cell.

关键词： Broadband communication Signal to noise ratio Narrowband Probes Microwave imaging Microwave circuits

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First-principles studies of dopant and radiation defect effects on optical fiber sensors 11

First-principles studies of dopant and radiation defect effe...

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11th Nuclear Plant Instrumentation, Control, and Human-Machine Interface Technologies, NPIC and HMIT 2019

作者： Da Silver, Thiago H. Butler, Drew Biaggne, Austin Kandadai, Nirmala Subbaraman, Harish Daw, Joshua Li, Lan Micron School of Materials Science and Engineering Boise State University 1910 University Drive BoiseID83725 United States Department of Electrical and Computer Engineering Boise State University 1910 University Drive BoiseID83725 United States High Temperature Test Laboratory Idaho National Laboratory 2525 Fremont Avenue Idaho FallsID83415 United States Center for Advanced Energy Studies 995 University Blvd Idaho FallsID83401 United States

ISBN: (纸本)9780894487835

Density functional theory-based calculations and ab-initio molecular dynamics have been performed in order to study the effects of dopants and radiation defects on the structures and optical properties of amorphous silica in comparison to sapphire - another high-temperature and radiation-resistant material. Out studies focused on oxygen deficient centers ODCs (a typical point defect due to radiation damage) and fluorine F dopants. Optical properties depend on dielectric function, calculated from the charge density of the material. With real- and imaginary-part dielectric functions, all the other optical properties, such as refractive index, energy loss function, and absorption coefficient, could be derived. Optical properties of amorphous silica and sapphire become anisotropic with either ODC or F dopants. They contribute characteristic peaks to the optical spectra and induce minor peaks in the low photon energy ranges. Static optical coefficients significantly increase with F dopants, but they might remain or slightly increase with ODC. Our results suggest that adding dopants can improve the optical properties of the materials and potentially inhabit the formation of high-temperature and radiation defects, resulting in an enhancement of the light signal in their transmitted spectra. Controlling dopant concentration also plays a crucial role, because a high dopant concentration could cause a structural distortion and degrade the optical performance of the material. © 2018 Westinghouse Electric Company LLC All Rights Reserved

关键词： Sapphire

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Evaluation of the vortex core size in gate-tunable Josephson junctions in Corbino geometry

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Physical Review B 2020年第4期102卷 045301-045301页

作者： Sadashige Matsuo Mizuki Tateno Yosuke Sato Kento Ueda Yuusuke Takeshige Hiroshi Kamata Joon Sue Lee Borzoyeh Shojaei Christopher J. Palmstrøm Seigo Tarucha Department of Applied Physics The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan JST PRESTO 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan Center for Emergent Matter Science RIKEN 2-1 Hirosawa Wako-shi Saitama 351-0198 Japan California NanoSystems Institute University of California Santa Barbara California 93106 USA Materials Department University of California Santa Barbara California 93106 USA Electrical and Computer Engineering University of California Santa Barbara California 93106 USA

We report on electron transport in gate-tunable Corbino-geometry Josephson junctions (CJJs) fabricated from an epitaxially grown Aluminum (Al) superconductor on an InAs quantum well. We observed that a supercurrent can be tuned by the gate voltage and sweeping an out-of-plane magnetic field initiates a sudden rise in the electrical resistance. From the analysis using a theoretical model for flow resistance due to Josephson vortices in CJJs, we evaluate the vortex core size, which substantially depends on the carrier density and temperature. These results will be subsequently utilized for future operations of the Josephson vortices in CJJs.

关键词： Transport phenomena Vortices in superconductors Josephson junctions Quantum wells

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