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IEEE International Frequency Control Symposium

作者： T.S. Kalkur Milad Hmeda Almonir Mansour Pamir Alpay Nick Sbockey G.S. Tompa Department of Electrical and Computer Engineering University of Colorado Colorado Springs Colorado Springs CO USA Department of Materials Science and Engineering and Institute of Material Science University of Connecticut Storrs CT USA Structured Material Industries Inc. Piscataway NJ 08854 USA Structured Material Industries Inc. Piscataway NJ USA

A solidly mounted tunable barium strontium GaN/Sapphire substrate using a metalorganic solution deposition (MOSD) technique. An acoustic Bragg reflector was first formed on the GaN/sapphire substrate consisting of alternating layers of silicon dioxide and tantalum oxide deposited using a-spin on technique. Lower and upper electrodes were fabricated using sputter deposited platinum. The resonant frequency of the resonator could be tuned from 5.17 GHz to 5.20 GHz by applying a voltage of 8 V, resulting in tunability of about 0.6%. The quality factor of the resonator was found to depend on the applied voltage, with a maximum quality factor of 216 observed for an applied bias voltage of 8 V. The effective electromechanical coupling coefficient (kt 2 ) of the resonator was found to be 13.1% at 8 V.

关键词： Gallium nitride Resonant frequency Substrates Acoustics Radio frequency Films Switches

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Charge transport and exciton dissociation in organic solar cells consisting of dipolar donors mixed with C70

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Physical Review B 2015年第8期92卷 085404-085404页

作者： Olga L. Griffith Xiao Liu Jojo A. Amonoo Peter I. Djurovich Mark E. Thompson Peter F. Green Stephen R. Forrest Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor Michigan USA Department of Material Science and Engineering University of Michigan Ann Arbor Michigan USA Department of Chemistry University of Southern California Los Angeles California USA Department of Physics University of Michigan Ann Arbor Michigan USA

We investigate dipolar donor materials mixed with a C70 acceptor in an organic photovoltaic (OPV) cell. Dipolar donors that have donor-acceptor-acceptor (d-a-a′) structure result in high conductivity pathways due to close coupling between neighboring molecules in the mixed films. We analyze the charge transfer properties of the dipolar donor:C70 mixtures and corresponding neat donors using a combination of time-resolved electroluminescence from intermolecular polaron pair states and conductive tip atomic force microscopy, from which we infer that dimers of the d-a-a′ donors tend to form a continuous network of nanocrystalline clusters within the blends. Additional insights are provided by quantum-mechanical calculations of hole transfer coupling and hopping rates between donor molecules using nearest-neighbor donor packing motifs taken from crystal structural data. The approximation using only nearest-neighbor interactions leads to good agreement between donor hole hopping rates and the conductive properties of the donor:C70 blends. This represents a significant simplification from requiring details of the nano- and mesoscale morphologies of thin films to estimate their electronic characteristics. Using these dipolar donors, we obtain a maximum power conversion efficiency of 9.6±0.5% under 1 sun, AM1.5G simulated illumination for an OPV comprised of an active layer containing a dipolar donor mixed with C70.

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Switchable band pass BAW filter based on Ba0.7Sr0.3TiO3 for C band RF applications

Switchable band pass BAW filter based on Ba0.7Sr0.3TiO3 for ...

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IEEE International Symposium on Applications of Ferroelectrics (ISAF)

作者： Almonir Mansour Milad Hmeda T.S. Kalkur Pamir Alpay Nick Sbockey G.S. Tompa Departrnent of Electrical and Computer Engineering University of Colorado Colorado Springs Colorado Springs CO USA Department of Materials Science and Engineering University of Connecticut Storrs CT USA Structured Material Industries Inc. Piscataway NJ USA

This paper presents the design and fabrication of a switchable band pass filter based on barium strontium titanate (Ba 0.7 Sr 0.3 TiO 3 ) thin film materials. This filter is designed and fabricated as a solidly mounted resonator (SMR) using spin-on metal organic solution decomposition. It consists of six film bulk acoustic resonators (FBARs), two series and four shunt. Without voltage biasing, there is no frequency switching and the filter has shown capacitive response of return loss S11 at -3 dB and insertion loss of -21 dB. By applying 10.8 dc voltage to the six resonators, the filter has exhibited band pass response at 4.67 GHz with 150 MHz band width and insertion loss of 3.8 dB and shown an agreement between the simulation and measurement results.

关键词： Band-pass filters Resonator filters Insertion loss Film bulk acoustic resonators Switches Loss measurement Microwave filters

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Passive mode-locking of transform-limited hundred-ps long pulses using an integrated nonlinear microring resonator

Passive mode-locking of transform-limited hundred-ps long pu...

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Integrated Photonics Research, Silicon and Nanophotonics, IPRSN 2015

作者： Reimer, Christian Kues, Michael Wetzel, Benjamin Roztocki, Piotr Little, Brent E. Chu, Sai T. Moss, David J. Morandotti, Roberto INRS-EMT 1650 Boulevard Lionel-Boulet VarennesQCJ3X 1S2 Canada Xi'an Institute of Optics Precision Mechanics of CAS Xi'an China City University of Hong Kong Department of Physics and Material Science Tat Chee Avenue Hong Kong Hong Kong School of Electrical and Computer Engineering RMIT University MelbourneVIC3001 Australia

We observe passive mode-locking at ultra-low power levels generating near transformlimited 570ps pulses at a 14.8MHz repetition rate. This is achieved by using high nonlinear enhancement in a CMOS-compatible microring... 详细信息

ISBN: (纸本)9781557520005

关键词： Passive mode locking

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Valence-loss EELS Spectroscopy of Refractory Plasmonic Nanomaterials

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Microscopy and Microanalysis 2015年第S3期21卷 1901-1902页

作者： Andrew A. Herzing Urcan Guler Xiuli Zhou Theodore B. Norris Material Measurement Laboratory National Institute of Standards and Technology Gaithersburg MD USA. School of Electrical & Computer Engineering Purdue University West Lafayette IN USA. Center for Ultrafast Optical Science University of Michigan Ann Arbor MI USA.

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Electrohydrodynamic jet printing of micro-optical devices

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Manufacturing Letters 2014年第1期2卷 4-7页

作者： Sutanto, Erick Tan, Yafang Onses, M. Serdar Cunningham, Brian T. Alleyne, Andrew Mechanical Science and Engineering Department University of Illinois Urbana Champaign United States Electrical and Computer Engineering Department University of Illinois Urbana Champaign United States Material Science and Engineering Department University of Illinois Urbana Champaign United States

The Electrohydrodynamic-jet (E-jet) printing process combines high resolution printing with a large variety of printing materials, making E-jet suitable for applications ranging from flexible electronics to high resolution biosensors. In this article, we explore a novel E-jet printing application fabricating high-resolution micro-optical devices. Examples given are a microlens array, an optical waveguide multiplexer, and a multi-refractive index diffraction grating. Additionally, this work presents the potential use of a multi nozzle printhead to perform low cost and flexible heterogeneous integration of multiple materials with different optical properties. © 2013 Society of Manufacturing Engineers (SME).

关键词： 3D printers

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Experimental Verification of Overlimiting Current by Surface Conduction and Electro-Osmotic Flow in Microchannels

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Physical Review Letters 2015年第11期114卷 114501-114501页

作者： Sungmin Nam Inhee Cho Joonseong Heo Geunbae Lim Martin Z. Bazant Dustin Jaesuk Moon Gun Yong Sung Sung Jae Kim Department of Electrical and Computer Engineering Seoul National University Seoul 151-744 Republic of Korea Department of Mechanical Engineering Pohang University of Science and Technology Pohang 790-784 Republic of Korea Department of Chemical Engineering and Mathematics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA Department of Material Science and Engineering Hallym University Chunchon 200-702 Republic of Korea Big Data Institute and Inter-university Semiconductor Research Center Seoul National University Seoul 151-744 Republic of Korea

Direct evidence is provided for the transition from surface conduction (SC) to electro-osmotic flow (EOF) above a critical channel depth (d) of a nanofluidic device. The dependence of the overlimiting conductance (OLC) on d is consistent with theoretical predictions, scaling as d−1 for SC and d4/5 for EOF with a minimum around d=8 μm. The propagation of transient deionization shocks is also visualized, revealing complex patterns of EOF vortices and unstable convection with increasing d. This unified picture of surface-driven OLC can guide further advances in electrokinetic theory, as well as engineering applications of ion concentration polarization in microfluidics and porous media.

关键词： Porous materials

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Frequency comb of time-bin entangled photon pairs on a chip

Frequency comb of time-bin entangled photon pairs on a chip

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European Quantum Electronics Conference, EQEC 2015

作者： Kues, Michael Reimer, Christian Roztocki, Piotr Wetzel, Benjamin Grazioso, Fabio Little, Brent E. Chu, Sai T. Moss, David J. Caspani, Lucia Morandotti, Roberto INRS-EMT 1650 Boulevard Lionel-Boulet Varennes QuébecJ3X 1S2 Canada Xi'an Institute of Optics and Precision Mechanics of CAS Xi'an China Department of Physics and Material Science City University of Hong Kong Tat Chee Avenue Hong Kong Hong Kong School of Electrical and Computer Engineering RMIT University MelbourneVIC3001 Australia School of Engineering and Physical Sciences Heriot-Watt University EdinburghEH14 4AS United Kingdom

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Active shape-morphing elastomeric colloids in short-pitch cholesteric liquid crystals

arXiv

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arXiv 2016年

作者： Evans, Julian S. Sun, Yaoran Senyuk, Bohdan Keller, Patrick Pergamenshchik, Victor M. Lee, Taewoo Smalyukh, Ivan I. Department of Physics University of Colorado BoulderCO80309 United States Centre for Optical and Electromagnetic Research Zhejiang University Hangzhou310058 China Institut Curie Centre de Recherche CNRS UMR 168 Université Pierre et Marie Curie Paris cedex 0575248 France Department of Chemistry and Biochemistry and Liquid Crystal Materials Research Center University of Colorado BoulderCO80309 United States Material Science and Engineering Program Department of Electrical Computer & Energy Engineering Liquid Crystal Materials Research Center University of Colorado BoulderCO80309 United States Institute of Physics Prospect Nauky 46 Kyiv03039 Ukraine Renewable and Sustainable Energy Institute National Renewable Energy Laboratory University of Colorado BoulderCO80309 United States

Active elastomeric liquid crystal particles with initial cylindrical shapes are obtained by means of soft lithography and polymerization in a strong magnetic field. Gold nanocrystals infiltrated into these particles mediate energy transfer from laser light to heat, so that the inherent coupling between the temperature-dependent order and shape allows for dynamic morphing of these particles and well-controlled stable shapes. Continuous changes of particle shapes are followed by their spontaneous realignment and transformations of director structures in the surrounding cholesteric host, as well as locomotion in the case of a nonreciprocal shape morphing. These findings bridge the fields of liquid crystal solids and active colloids, may enable shape-controlled self-assembly of adaptive composites and light-driven micromachines, and can be understood by employing simple symmetry considerations along with electrostatic analogies. Copyright © 2016, The Authors. All rights reserved.

关键词： Colloids

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Femto second pulsed laser deposition of nanoparticulate thin film of Gd5(SixGe1−x)4

Femto second pulsed laser deposition of nanoparticulate thin...

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International Conference on Magnetics (INTERMAG)

作者： R. L. Hadimani A. H. Shaw D. L. Schlagel T. A. Lograsso J. H. Da Silva A. M. Pereira J. P. Araujo 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 Material Science and Engineering Iowa State University Ames IA Departamento de Física e Astronomia da Universidade do Porto Porto Portugal School of Physical Electronics University of Electronic Science and Technology of China Chengdu

Pulsed Laser Deposition (PLD) using a femtosecond laser has improved the surface roughness, quality of thin films and deposition time significantly over nanosecond lasers. However characterizing these thin films especially the composition using Energy Dispersive X-ray Spectroscopy (EDS) is challenging. We report the successful growth and characterization of thin films of giant magnetocaloric Gd 5 Si 1.3 Ge 2.7 using femtosecond PLD. We also report that annealing of Gd 5 Si 1.3 Ge 2.7 thin film at 1000 K showed disappearance of particles on the film and the phase transition in the magnetic measurements.

关键词： Heat treatment Films Pulsed laser deposition Magnetostriction Ultrafast electronics Laser theory X-ray lasers

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