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Near infrared optical upconverter based on i-In0.53Ga 0.47As/C60 photovoltaic junction

Near infrared optical upconverter based on i-In0.53Ga 0.47As...

2009 Conference on Lasers and Electro-Optics and 2009 Conference on Quantum Electronics and Laser science Conference, CLEO/QELS 2009

作者： Chen, Jun Ban, Dayan Helander, Michael G. Zhenghong, Lu Graf, Marcel SpringThorpe, Anthony J. Liu, H.C. Department of Electrical and Computer Engineering University of Waterloo 200 University Avenue West Waterloo N2L 3G1 Canada Department of Materials Science and Engineering University of Toronto 184 College Street Toronto M5S 3E4 Canada Institute for Microstructural Sciences National Research Council M-50 1200 Montreal Road Ottawa K1A 0R6 Canada

We report a near-infrared to visible-light optical upconverter by the integration of an i-In0.53Ga0.47As/C60 junction and organic light emitting diode. This device shows the photovoltaic effect of i-In0.53Ga0.47As/C60... 详细信息

ISBN: (纸本)9781557528698

关键词： Photovoltaic effects

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Electroactive polymer actuation at the nanoscale

Electroactive polymer actuation at the nanoscale

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2006 6th IEEE Conference on Nanotechnology, IEEE-NANO 2006

作者： Lee, Alexander S. Ly, James V. Peteu, Serban F. Thompson, Mark E. Zhou, Chongwu Requicha, Aristides A. G. Laboratory for Molecular Robotics University of Southern California Los Angeles CA 90089-0781 United States Mork Family Department of Chemical Engineering and Materials Science University of Southern California Los Angeles CA 90089-0781 United States Department of Chemistry University of Southern California Los Angeles CA 90089-0781 United States Department of Electrical Engineering University of Southern California Los Angeles CA 90089-0781 United States Department of Computer Science University of Southern California Los Angeles CA 90089-0781 United States

ISBN: (纸本)1424400783

Nanoscale actuators are required for the development of nanorobots and other nanoelectromechanical systems (NEMS) of the future. Actuators based on electrochemically-induced volumetric changes in electroactive polymers (EAPs) have been demonstrated at the macro and microscales, and have been used for artificial muscles and other applications. Here we experimentally and quantitatively demonstrate for the first time that the fundamental phenomena underlying EAP actuation are still active at spatial scales below 100 nm. This opens new directions in nanorobot and NEMS research. Individual polypyrrole structures are investigated in this paper by using atomic force microscopy (AFM) with electrochemistry capabilities. Polypyrrole-based nanowires (∼ 50 nm diameter, ∼ 6 μm in length) and single-walled carbon nanotubes coated with a polypyrrole film ∼125 nm thick both show actuation behavior. The nanowire dimensions change from ∼ 2% to as much as ∼ 35%. The single-walled nanotube-polypyrrole structures show a considerably lower percentage of dimensional change. © 2006 IEEE.

关键词： Nanorobotics

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Rotationally aligned hexagonal boron nitride on sapphire by high-temperature molecular beam epitaxy

arXiv

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arXiv 2019年

作者： Page, Ryan Cho, Yongjin Casamento, Joseph Rouvimov, Sergei Xing, Huili Grace Jena, Debdeep Department of Materials Science and Engineering Cornell University IthacaNY14853 United States School of Electrical and Computer Engineering Cornell University IthacaNY14853 United States Department of Electrical Engineering University of Notre Dame Notre Dame IN46556 Kavli Institute at Cornell for Nanoscale Science Cornell University IthacaNY14853 United States

Hexagonal boron nitride (hBN) has been grown on sapphire substrates by ultrahigh-temperature molecular beam epitaxy (MBE). A wide range of substrate temperatures and boron fluxes have been explored, revealing that high crystalline quality hBN layers are grown at high substrate temperatures, >1600℃, and low boron fluxes, ∼1 × 10%& Torr beam equivalent pressure. In situ reflection high-energy electron diffraction revealed the growth of hBN layers with 60° rotational symmetry and the [112+0] axis of hBN parallel to the [11+00] axis of the sapphire substrate. Unlike the rough, polycrystalline films previously reported, atomic force microscopy and transmission electron microscopy characterization of these films demonstrate smooth, layered, few-nanometer hBN films on a nitridated sapphire substrate. This demonstration of high-quality hBN growth by MBE is a step toward its integration into existing epitaxial growth platforms, applications, and technologies. Copyright © 2019, The Authors. All rights reserved.

关键词： Boron nitride

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Relationship of basal plane and prismatic stacking faults in GaN to low temperature photoluminescence peaks at ∼3.4 eV and ∼3.2 eV

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MRS Online Proceedings Library (OPL) 2011年第1期831卷 E11.37-E11.37页

作者： J. Bai M. Dudley L. Chen B. J. Skromme P. J. Hartlieb E. Michaels J. W. Kolis B. Wagner R. F. Davis U. Chowdhury Department of Materials Science & Engineering Stony Brook University Stony Brook New York 11794–2275 U.S.A. Department of Electrical Engineering and Center for Solid State Electronics Research Arizona State University Tempe Arizona 85287–5706 U.S.A. Department of Chemistry Clemson University Clemson South Carolina 29634 U.S.A. Department of Materials Science and Engineering North Carolina State University Raleigh NC 27695–7907 U.S.A. School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332–0250 U.S.A.

The relationship between the optical properties and microstructure of GaN is of great interest due to the important optical and electronic applications of this material. Several different studies have been reported attempting to link the low temperature photoluminescence (PL) peak at ∼3.4 eV to the presence of various microstructural defects. However, no clear systematic studies have been reported establishing such a link for the PL peak observed at ∼3.2 eV. In this paper, we present evidence linking the ∼3.4 eV PL peak to the presence of a thin layer of cubic phase associated with basal plane stacking faults (BSF). This relationship is mainly established by studying a series of ammonothermally-grown GaN bulk crystals. The existence and strength of the ∼3.4 eV peak are found to be related to the I2 type BSF (RI2=1/3<1>) observed in these samples. To investigate the relationship between the ∼3.2 eV peak and structural defects, a series of GaN epilayers grown on either SiC or sapphire (of various off-cut angles) was investigated by TEM and PL spectroscopy. Samples grown on 3.5° off-cut SiC and 5° and 9° off-cut sapphire substrates exhibit PL peaks near ∼3.2 and ∼3.4 eV, which are absent in the on-axis SiC and sapphire cases. TEM shows that the former group of samples has defect configurations consisting of prismatic stacking faults (PSFs) folding back and forth between two different {1120} planes connected by stair rod dislocations, which in turn fold onto to I1 type BSFs again with stair rod dislocations at the fault intersections. The ∼3.2 eV PL peaks are proposed to possibly arise from transitions involving the PSFs and the stair rods associated with their mutual intersections and their intersections with the BSFs. The ∼3.4 eV peak is again attributed to the thin layer of cubic phase associated with the I1 type BSF (three bilayers as opposed to four bilayers for the I2 type BSF).

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Organic/inorganic hybrid optical amplifier with wavelength conversion

Organic/inorganic hybrid optical amplifier with wavelength c...

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CLEO: science and Innovations

作者： Chen, Jun Ban, Dayan Helander, Michael G. Lu, Zhenghong Poole, Philip Department of Electrical and Computer Engineering University of Waterloo 200 University Avenue West Waterloo N2L 3G1 Canada Department of Materials Science and Engineering University of Toronto 184 College Street Toronto M5S 3E4 Canada Institute for Microstructural Sciences National Research Council 1200 Montreal Road Ottawa K1A 0R6 Canada

We report an organic/inorganic hybrid optical amplifier with a function of converting infrared light to visible light. This device integrates an InGaAs/InP heterojunction phototransistor (HPT) and an organic light emi... 详细信息

ISBN: (纸本)9781557529107

关键词： Heterojunctions

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Landau Polaritons in a Full-Dielectric Three-Dimensional Photonic-Crystal Cavity

Landau Polaritons in a Full-Dielectric Three-Dimensional Pho...

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CLEO: science and Innovations, S and I 2022

作者： Tay, Fuyang Mojibpour, Ali Liang, Shuang Baydin, Andrey Ahmadivand, Arash Peraca, Nicolas Marquez Xu, Hongjing Gardner, Geoff C. Manfra, Michael J. Hagenmüller, David Kono, Junichiro Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics and Astronomy Purdue University West LafayetteIN47907 United States Birck Nanotechnology Center Purdue University West LafayetteIN47907 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Microsoft Quantum Purdue Purdue University West LafayetteIN47907 United States School of Electrical and Computer Engineering Purdue University West LafayetteIN47907 United States School of Materials Engineering Purdue University West LafayetteIN47907 United States Université de Strasbourg CNRS Strasbourg67000 France Department of Materials Science and NanoEngineering Rice University HoustonTX77005 United States

ISBN: (纸本)9781557528209

We fabricated a full-dielectric three-dimensional photonic-crystal cavity containing an ultrahigh-mobility two-dimensional electron gas. By applying a strong perpendicular magnetic field, we created Landau polaritons originating from the ultrastrong coupling of electrons with cavity modes. © Optica Publishing Group 2022, © 2022 The Author(s)

关键词： Polariton

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A novel physics-regularized interpretable machine learning model for grain growth

arXiv

引用

arXiv 2022年

作者： Yan, Weishi Melville, Joseph Yadav, Vishal Everett, Kristien Yang, Lin Kesler, Michael S. Krause, Amanda R. Tonks, Michael R. Harley, Joel B. Department of Electrical and Computer Engineering University of Florida GainesvilleFL United States Department of Materials Science and Engineering University of Florida GainesvilleFL United States Oak Ridge National Laboratory Oak RidgeTN United States

Experimental grain growth observations often deviate from grain growth simulations, revealing that the governing rules for grain boundary motion are not fully understood. A novel deep learning model was developed to capture grain growth behavior from training data without making assumptions about the underlying physics. The Physics-Regularized Interpretable Machine Learning Microstructure Evolution (PRIMME) model consists of a multi-layer neural network that predicts the likelihood of a point changing to a neighboring grain. Here, we demonstrate PRIMME's ability to replicate two-dimensional normal grain growth by training it with Monte Carlo Potts simulations. The trained PRIMME model's grain growth predictions in several test cases show good agreement with analytical models, phase-field simulations, Monte Carlo Potts simulations, and results from the literature. Additionally, PRIMME's adaptability to investigate irregular grain growth behavior is shown. Important aspects of PRIMME like interpretability, regularization, extrapolation, and overfitting are also discussed. © 2022, CC BY-NC-ND.

关键词： Grain growth

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引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Chi-Huang Chen Sheau-Ling Hsieh Yung-Ching Weng Wen-Yung Chang Feipei Lai Department of Electrical Engineering National Taiwan University Taipei Taiwan EECS International Graduate Program Institute IT Center National Chiao Tung University Hsinchu Taiwan Department of Computer Science and Engineering National Taiwan University Taiwan Institute of Computer Science and Engineering College of Computer Science National Chiao Tung University Taiwan Graduate Institute of Biomedical Electronics and Bioinformatics National Taiwan University Taiwan

Semantic similarity measure plays an essential role in Information Retrieval and Natural Language Processing. In this paper we propose a page-count-based semantic similarity measure and apply it in biomedical domains. Previous researches in semantic web related applications have deployed various semantic similarity measures. Despite the usefulness of the measurements in those applications, measuring semantic similarity between two terms remains a challenge task. The proposed method exploits page counts returned by the Web Search Engine. We define various similarity scores for two given terms P and Q, using the page counts for querying P, Q and P AND Q. Moreover, we propose a novel approach to compute semantic similarity using lexico-syntactic patterns with page counts. These different similarity scores are integrated adapting support vector machines, to leverage the robustness of semantic similarity measures. Experimental results on two datasets achieve correlation coefficients of 0.798 on the dataset provided by A. Hliaoutakis, 0.705 on the dataset provide by T. Pedersen with physician scores and 0.496 on the dataset provided by T. Pedersen et al. with expert scores.

关键词： Semantics Biomedical measurements Correlation Kernel Training Medical services Support vector machine classification

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Room temperature ferromagnetic nanoparticles of Gd5Si4

Room temperature ferromagnetic nanoparticles of Gd5Si4

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International Conference on Magnetics (INTERMAG)

作者： R. L. Hadimani S. M. Harstad S. Gupta V. K. Pecharsky E. A. Balfou H. Fu D. Jiles Department of Electrical and Computer Engineering Iowa State University Ames IA US Department of Energy Ames Laboratory Ames IA Department of Materials Science and Engineering Iowa State University Ames IA School of Physical Electronics University of Electronic Science and Technology of China Chengdu

Gd 5 (Si x Ge 1-x ) 4 compounds undergo first order phase transitions close to room temperature when x @ 0.5, which are accompanied by extreme changes of properties. We report the fabrication of nanoparticles of one of the parent compounds - Gd 5 Si 4 - using high energy ball milling. Crystal structure, microstructure and magnetic properties have been investigated. Particles agglomerate at long milling times and the particles that are milled longer than 20 min lose crystallinity and no longer undergo magnetic phase transition close to 340 K, which is present in a bulk material. Samples milled for more than 20 min exhibit a slightly increased coercivity.

关键词： Milling Nanoparticles Iron Powders Compounds Fabrication Ball milling

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Novel organic materials and technological advances for photonics

Novel organic materials and technological advances for photo...

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Novel Organic Material and Technological Advances for Photonic E-MRS 2001

作者： Ledoux-Rak, Isabelle Dodabalapur, Ananth Blom, Paul Lab. De Photo. Quantique Et Mole. Ecole Normale Super. De Cachan 61 Ave. du President Wilson 94235 Cachan France Department of Electrical and Computer Engineering Microelectronics Research Center University of Texas of Austin Austin TX United States Materials Science Centre Groningen Netherlands

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