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Valence-loss EELS Spectroscopy of Refractory Plasmonic Nanomaterials

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： SURFACE conductivity ELECTRO-osmostic pressure MICROCHANNEL flow NANOFLUIDIC devices DEIONIZATION of water ELECTROKINETICS

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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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Temperature Control for Nano-Scale Films by Spatially-Separated Atomic Layer Deposition Based on Generalized Predictive Control

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IEEE Transactions on Nanotechnology 2015年第6期14卷 1094-1103页

作者： He, Wen-Jie Zhang, Hai-Tao Chen, Zhiyong Lin, Ji-Long Tian, Kan Shan, Bin Chen, Rong State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Key Laboratory of Image Processing and Intelligent Control School of Automation State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan430074 China School of Electrical Engineering and Computer Science University of Newcastle CallaghanNSW2308 Australia China-EU Institute for Clean and Renewable Energy Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Material Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China

This paper established a closed-loop temperature control system for a spatially-separated atomic layer deposition (S-ALD) reactor using generalized predictive control (GPC) algorithm. The GPC-based closed-loop control system rapidly and precisely stabilized the reactor temperature in the presence of thermal field disturbances. Compared with the proportion-integration differentiation (PID) control commonly used for S-ALD, the closed-loop GPC system attenuated reaction temperature oscillations when producing two-element nano-scale thin films. Furthermore, the proposed GPC system demonstrated the superiority in multi-element nano-laminates depositing efficiency by reducing the settling time with a substrate moving between different reactors. electrical and optical properties of films verified the feasibility of the proposed GPC system. Finally, experimental results presented that the microstructure of the deposited ALD nanometer thin film was improved with the developed GPC system, compared with the PID strategy. © 2002-2012 IEEE.

关键词： Atomic layer deposition

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Quantum entanglement distillation using an optical metamaterial

Quantum entanglement distillation using an optical metamater...

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Conference on Lasers and Electro-Optics (CLEO)

作者： M. Bechu M. Asano M. Tame S. K. Ozdemir R. Ikuta T. Yamamoto D. O. Guney L. Yang M. Wegener N. Imoto Institute of Applied Physics Karlsruhe Institute of Technology (KIT). Karlsruhe Germany Department of Material Engineering Science Osaka University Toyonaka Osaka Japan National Institute for Theoretical Physics University of KwaZulu-Natal Durban South Africa Department of Electrical and Systems Engineering Washington University St. Louis MO USA Department of Electrical and Computer Engineering Michigan Technological University Houghton MI USA Institute of Nanotechnology Karlsruhe Institute of Technology (KIT) Karlsruhe Germany

We perform an entanglement distillation protocol on pure and mixed states using optical metamaterials composed of gold nano-antennas and measure the density matrices by quantum-state tomography. The fidelity is improv... 详细信息

关键词： Quantum entanglement Photonics Metamaterials Gold Antenna arrays Quantum computing Optical filters

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Exciton valley relaxation in a single layer of WS2 measured by ultrafast spectroscopy

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Physical Review B 2014年第4期90卷 041414(R)-041414(R)页

作者： Cong Mai Yuriy G. Semenov Andrew Barrette Yifei Yu Zhenghe Jin Linyou Cao Ki Wook Kim Kenan Gundogdu Department of Physics North Carolina State University Raleigh North Carolina 27695 USA Department of Electrical and Computer Engineering North Carolina State University Raleigh North Carolina 27695 USA Department of Material Science and Engineering North Carolina State University Raleigh North Carolina 27695 USA

We measured the lifetime of optically created valley polarization in single-layer WS2 using transient absorption spectroscopy. The electron valley relaxation is very short (<1 ps). However, the hole valley lifetime is at least two orders of magnitude longer and exhibits a temperature dependence that cannot be explained by single-carrier spin/valley relaxation mechanisms. Our theoretical analysis suggests that a collective contribution of two potential processes may explain the valley relaxation in single-layer WS2. One process involves direct scattering of excitons from K to K′ valleys with a spin flip-flop interaction. The other mechanism involves scattering through the spin-degenerate Γ valley. This second process is thermally activated with an Arrhenius behavior due to the energy barrier between the Γ and K valleys.

关键词： SPECTRUM analysis SPIN polarization ACTIVATION energy EXCITON theory ABSORPTION spectra

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Integrated bi-chromatically pumped optical parametric oscillator for orthogonally polarized photon pair generation

Integrated bi-chromatically pumped optical parametric oscill...

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Integrated Photonics Research, Silicon and Nanophotonics, IPRSN 2015

作者： Reimer, Christian Kues, Michael Caspani, Lucia Wetzel, Benjamin Roztocki, Piotr Clerici, Matteo Jestin, Yoann Ferrera, Marcello Peccianti, Marco Pasquazi, Alessia Little, Brent E. Chu, Sai T. Moss, David J. Morandotti, Roberto INRS-EMT 1650 Boulevard Lionel-Boulet VarennesQCJ3X 1S2 Canada School of Engineering and Physical Sciences Heriot-Watt University SUPA EdinburghEH14 4AS United Kingdom Department of Physics and Astronomy University of Sussex Falmer BrightonBN1 9QH United Kingdom Xi'an Institute of Optics and 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

ISBN: (纸本)9781557520005

We demonstrate a novel bi-chromatically pumped OPO operating on orthogonal polarizations in a CMOS compatible micro-ring resonator. Below threshold the device operates in the quantum regime and cross-polarized heralded photons are directly generated. OCIS codes: (270.0270) Quantum optics;(130.3120) Integrated optics devices;(190.4380) Nonlinear optics, four-wave mixing;(190.4970) Parametric oscillators and amplifiers. © 2015 OSA.

关键词： Four wave mixing

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