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作者： Srivastava, Deepak Makeev, Maxim A. Menon, Madhu Osman, Mohamed Advanced Aerospace Materials and Devices Group UARC NASA Ames Research Center Moffett Field CA 94035-1000 United States Department of Physics Center for Computational Sciences University of Kentucky Lexington KY 40506 United States School of Electrical Engineering and Computer Science Washington State University Pullman WA 99164-2752 United States

Representative results of computer simulation and/or modeling studies of the nanomechanical and thermal transport properties of an individual carbon nanotube, silicon nanowire, and silicon carbide nanowire systems have been reviewed and compared with available experimental observations. The investigated nanomechanical properties include different elastic moduli of carbon nanotubes, silicon nanowires, and silicon carbide nanowires, all obtained within their elastic limits. Moreover, atomistic mechanisms of elastic to plastic transition under external stresses and yielding of carbon nanotubes under experimentally feasible temperature and strain rate conditions are discussed in detail. The simulation and/or modeling results on thermal properties, presented in this work, include vibrational modes, thermal conductivity and heat pulse transport through single carbon nanotubes, and thermal conductivity of silicon nanowires. Copyright © 2008 American Scientific Publishers All rights reserved.

关键词： Carbon nanotubes

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Improvement on the dynamic ID-based remote user authentication scheme

Improvement on the dynamic ID-based remote user authenticati...

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International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Yung-Cheng Lee Geeng-Kwei Chang Wen-Chung Kuo Jung-Lu Chu Department of Electrical Engineering Wu Feng Institute of Technology Chiayi Taiwan Department of Computer Science and Information Engineering National Formosa University Yunlin Taiwan The Institute of Opto-Mechatronics and Materials Wu Feng Institute of Technology Chiayi Taiwan

In 2004, Das et al. proposed a dynamic ID-based remote user authentication scheme. Their scheme allows users to select and update their passwords freely, and the server needs not maintain a verifier table. In this paper, we show that their scheme is not secure. Though there are several improvement schemes proposed to fix the flaws. However, we show that all improvement schemes have deficiency on dynamic merit. Finally, we propose an improvement scheme to enhance the security. The improvement scheme has dynamic merit such that adversary cannot trace the users.

关键词： Authentication Smart cards Servers Security Law Legal factors Resists

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Inorganic/organic hybrid optical upconversion device

Inorganic/organic hybrid optical upconversion device

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Conference on Lasers and Electro-Optics, 2007, CLEO 2007

作者： Ban, Dayan Han, Sijin Lu, Zhenghong Thorpe, Anthony J. Spring 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 hybrid optical upconversion device that emits visible light upon the detection of input near infrared light through direct tandem integration of an inorganic InGaAs/InP photodetector with an organic light ... 详细信息

ISBN: (纸本)9781557528346

关键词： Infrared devices

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Computational advancement in communication circuits and systems: Proceedings of ICCACCS 2014 1

Computational advancement in communication circuits and syst...

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1st International Conference on Computational Advancement in Communication Circuits and Systems, ICCACCS 2014

作者： Maharatna, Koushik Dalapati, Goutam Kumar Banerjee, P.K. Mallick, Amiya Kumar Mukherjee, Moumita School of Electronics and Computer Science University of Southampton Southampton United Kingdom Department of Design and Growth Institute of Materials Research and Engineering Singapore Singapore Electronics and Telecommunication Engineering Jadavpur University Kolkata West Bengal India Electronics and Electrical Communication Indian Institute of Technology Kharagpur Kharagpur West Bengal India Centre for Millimeter Wave Semiconductor Devices and Systems Defence Research and Development Organisation Kolkata West Bengal India

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Mesostructured composite materials with electrically tunable upconversion properties

arXiv

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arXiv 2017年

作者： Mundoor, Haridas Smalyukh, Ivan I. Department of Physics and Department of Electrical Computer and Energy Engineering Liquid Crystal Materials Research Center University of Colorado BoulderCO80309 Singapore Materials Science and Engineering Program Liquid Crystal Materials Research Center University of Colorado BoulderCO80309 Renewable and Sustainable Energy Institute National Renewable Energy Laboratory University of Colorado BoulderCO80309 United States

A promising approach of designing mesostructured materials with novel physical behavior is to combine unique optical and electronic properties of solid nanoparticles with long-range ordering and facile response of soft matter to weak external stimuli. Here we design, practically realize, and characterize orientationally ordered nematic liquid crystalline dispersions of rod-like upconversion nanoparticles. Boundary conditions on particle surfaces, defined through surface functionalization, promote spontaneous unidirectional self-alignment of the dispersed rod-like nanoparticles, mechanically coupled to the molecular ordering direction of the thermotropic nematic liquid crystal host. As host is electrically switched at low voltages . 1V, nanorods rotate, yielding tunable upconversion and polarized luminescence properties of the composite. We characterize spectral and polarization dependencies, explain them through invoking models of electrical switching and upconversion dependence on crystalline matrices of nanorods, and discuss potential practical uses. Copyright © 2017, The Authors. All rights reserved.

关键词： Nanorods

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FeNi-based Nanocomposite Soft Magnetic Alloy Magnetic and Mechanical Property Tailoring Through Flash Annealing

FeNi-based Nanocomposite Soft Magnetic Alloy Magnetic and Me...

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Magnetic Conference - Short Papers (INTERMAG Short Papers), IEEE International

作者： Lauren Wewer Kevin Byerly Samuel Kernion Paul Ohodnicki Mechanical Engineering and Materials Science University of Pittsburgh PA USA CorePower Magnetics Pittsburgh PA USA Electrical and Computer Engineering University of Pittsburgh PA USA Department of Physics & Astronomy University of Pittsburgh PA USA

Tailoring details of thermal processing, including controlled heating rates and annealing time, plays a key role in the enhancement of soft magnetic properties of amorphous and nanocrystalline soft magnetic materials. In particular, rapid thermal processing also known as flash annealing has shown potential for grain size refinement, tailoring of phase identity, and tuning of magnetic properties. This work explores the differences between conventional furnace annealing and isothermal annealing with flash annealing techniques for a range of detailed thermal processing conditions (temperature, time, cooling method) in an FeNi-based alloy. As compared to conventional annealing, flash annealing results in dominant FCC γ FeNi phase with refined grains. Microstructural refinement due to flash annealing showed improved soft magnetic properties with reduced coercivity and improved ductility for improved core manufacturing at scale.

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Analysis and Design of Vector Holographic Metasurfaces

Analysis and Design of Vector Holographic Metasurfaces

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Progress in Electromagnetic Research Symposium (PIERS)

作者： A. Pitilakis O. Tsilipakos A. C. Tasolamprou A. Tsioliaridou N. V. Kantartzis S. Ioannidis C. Liaskos M. Kafesaki Foundation for Research and Technology Hellas Institute of Electronic Structure and Laser Greece School of Electrical and Computer Engineering Aristotle University of Thessaloniki Greece National Hellenic Research Foundation Theoretical and Physical Chemistry Institute Greece Department of Physics National and Kapodistrian University of Athens Greece Foundation for Research and Technology Hellas Institute of Computer Science Greece School of Electrical & Computer Engineering Technical University of Crete Greece Department of Computer Science and Engineering University of Ioannina Greece Department of Materials Science and Technology University of Crete Greece

ISBN: (数字)9798350375909

ISBN: (纸本)9798350375916

In this work we present a comprehensive framework for the analysis and design of vector holographic metasurfaces (VHMS). The term vector refers to the metasurface ability to manipulate the polarization of the scattered wave, while holographic refers to the configuration of the metasurface aperture, which can have any arbitrary complex profile in its equivalent surface impedance (phase and/or magnitude). We start from the presentation of the analysis of such VHMS, i.e., the calculation of its scattering under given equivalent surface impedance configuration and illumination; the analysis relies on physical optics and can, in theory, model the scattering and diffraction by a finite-aperture metasurface of arbitrary convex shape under arbitrary spatially coherent wavefront illumination. We then present the VHMS design and synthesis procedure, i.e., we compute its equivalent and physical configuration, when given the illuminating wavefront and the desired scattering response or functionality, e.g., beam steering or focusing. For the synthesis, we use a simple scalable unit cell topology incorporating square conductor patches interconnected with lumped complex loads; these can locally and continuously tune the VHMS phase and amplitude response, with independent control over both polarizations, thus allowing arbitrary incident-to-scattered wavefront transformations. These versatile devices, especially when fused with wavefront sensing capabilities, can be used in applications spanning wireless communications (e.g., beamforming, integrated/joint sensing and communication, or programmable wireless environments), radar scattering (e.g., stealth), and holography/imaging.

关键词： Wireless communication Surface impedance Surface waves Scattering Physical optics Lighting Metasurfaces

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Infrared optical anisotropy of diluted magnetic Ga1−xMnxN∕c-sapphire epilayers grown with a GaN buffer layer by metalorganic chemical vapor deposition

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Physical Review B 2007年第20期75卷 205320-205320页

作者： Z. G. Hu A. B. Weerasekara N. Dietz A. G. U. Perera M. Strassburg M. H. Kane A. Asghar I. T. Ferguson Department of Physics and Astronomy Georgia State University Atlanta Georgia 30303 USA School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta Georgia 30332 USA School of Materials Science and Engineering Georgia Institute of Technology Atlanta Georgia 30332 USA

Optical anisotropy of hexagonal Ga1−xMnxN (x from 0.0% to 1.5%) epitaxial films grown on c-plane sapphire substrates has been investigated using far- and mid-infrared s- and p-polarized reflectance spectra at oblique incidence (at 10°, 22°, and 32°, respectively). The experimental data at room temperature can be well reproduced simultaneously in the measured frequency region of 200–2000cm−1 (5–50μm), which was based on a four-phase layered system using a 4×4 matrix method [M. Schubert, Phys. Rev. B 53, 4265 (1996)]. The lattice vibrations perpendicular and parallel to the optic c axis (E1 and A1 modes) were expressed by Lorentz oscillator dielectric function model. There was a striking absorption dip at the A1 phonon frequency in p-polarized reflectance spectra due to the optical anisotropy. These infrared-active phonon parameters were obtained with uniaxial dielectric tensor. It was found that the A1 longitudinal-optical phonon frequency linearly increases with the Mn composition for the diluted magnetic semiconductor epilayers. The broadening values of the A1 phonon changed from 3.6 (±1.3) to 9.0 (±1.6)cm−1, showing the high film crystal quality. Moreover, the ordinary and extraordinary dielectric functions ε⊥ and ε‖ of the epilayers were determined. It indicated that ε‖ was larger than ε⊥ for the Ga1−xMnxN films in the reststrahlen region, which can be ascribed to slight structural degradation of the wurtzite lattice.

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Femtosecond Laser Damage Comparison Between Silica/Hafnia Nanolaminates vs. Mixed Material Coatings for High Power Laser Optics

Femtosecond Laser Damage Comparison Between Silica/Hafnia Na...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Emma DaAngelis Mohamed Yaseen Noor Maxwell Weiss Carmen Menoni Enam Chowdhury Department of Materials Science and Engineering The Ohio State University Columbus Ohio USA Electrical and Computer Engineering Department Colorado State University Fort Collins CO USA XUV Lasers Inc. Fort Collins CO USA

Two layer anti-reflection coatings (Air/SiO 2 /HfSiO/substrate. vs Air/SiO 2 /Hf-SiO 2 nanolaminates/substrate) were tested with p-polarized 77 fs 1030 nm laser pulses. Damage threshold fluence of the sample with nan... 详细信息

ISBN: (纸本)9798350369311

关键词： Power lasers Coatings Ultrafast optics Laser pulses Electro-optical waveguides

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Infrared organic/inorganic optical upconverting devices

Infrared organic/inorganic optical upconverting devices

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International Symposium on Photoelectronic Detection and Imaging 2009: Advances in Infrared Imaging and Applications

作者： Ban, Dayan Chen, Jun Helander, Michael G. Lu, Zhenghong Graf, Marcel Springthorpe, Anthony J. Poole, P. Liu, H.C. Department of Electrical and Computer Engineering University of Waterloo 200 University Avenue West Waterloo ON 2L 3G1 Canada Department of Materials Science and Engineering University of Toronto 184 College Street Toronto ON M5S 3E4 Canada Institute for Microstructural Sciences National Research Council 1200 Montreal Road Ottawa ON K1A 0R6 Canada

ISBN: (纸本)9780819476647

This paper presents our research and development efforts in realizing and perfecting organic/inorganic photon upconversion devices for wavelengths from near infrared (1.5 μm) region to visible light (green). The basic idea is to integrate an InGaAs/InP photodetector with an organic light emitting diode (OLED), connected in series. The detected photocurrent drives the OLED to emit visible light, thereby achieving the upconversion. A few approaches of integration methods and device designs have been tested. © 2009 SPIE.

关键词： Photodetectors

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