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IEEE PhotonicsGlobal@Singapore, IPGC

作者： Deng Jun Jia Wei Vanga Sudheer Kumar Ching Eng Png Andrew A. Bettiol Aaron J. Danner Institute of High Performance Computing Agency for Science Technology and Research (ASTAR) Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore Henan Key Laboratory of Laser and O pto-electric Information Technology Zhengzhou University Henan China Department of Physics National University of Singapore Singapore

Photonic crystals realized in LiNbO 3 have a great potential to reduce the size and increase the functionality of integrated optical devices. In order to accomplish these aims, fabrication know-how must be mastered yet it remains relatively uncharted. In this work we report the fabrication and optical characterization of photonic crystal structures in annealed proton exchanged (APE) LiNbO 3 waveguides. In our work, channel waveguides were fabricated by photolithography patterning followed by immersing LiNbO 3 wafers in molten benzoic acid at 235°C for 5 h. The thickness and the composition profiles of the APE waveguides were measured using the secondary ion mass spectroscopy (SIMS) method. The experimental characterization of the photonic crystal waveguides was performed and a photonic stop band with good sharpness can be observed from the transmission spectra.

关键词： Photonics Optical fibers Optical device fabrication Optical imaging Optical polarization

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Integrating a scalable and effcient semi-Lagrangian multi-tracer transport scheme in HOMME

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Procedia computer science 2012年 9卷 994-1003页

作者： Christoph Erath Peter H. Lauritzen Jose H. Garcia Henry M. Tufo The Computational & Information Systems Laboratory National Center for Atmospheric Research P.O. Box 3000 Boulder CO 80307 USA Department of Computer Science University of Colorado at Boulder Engineering Center 430 UCB Boulder CO 80309 USA Climate and Global Dynamics Division National Center for Atmospheric Research P.O. Box 3000 Boulder CO 80307 USA

With the inclusion of a scalable spectral-element-based version of the High-Order Method Modeling Environment (HOMME) in NCAR's Community Atmosphere Model (CAM) and the need for on the order of 100 prognostic tracers in next generation climate modeling efforts, there is an urgent need for a scalable, monotonic, and conservative multitracer advection scheme in HOMME. To address this, we integrate a Conservative Semi-LAgrangian Multi-tracer transport scheme (CSLAM) into HOMME. The algorithm is specifically re-designed for multiple processors and the cubed-sphere grid with the element-wise domain decomposition as employed by HOMME. Based on these spectral elements, we create a finite volume mesh and add a halo zone of cells since a higher-order CSLAM needs a patch of tracer values for a reconstruction that extend the element. Therefore, we extend HOMME to also be capable of communicating cell center data. Our data structures and design allow us to provide a numerical scheme that still conserves mass locally to machine precision and is also monotone on multiple processor systems, but reduces the communication of tracer values by one for each time step. This is based on the idea that we calculate the reconstruction coeffcients redundantly, in a cell of an element and in the corresponding cell in the halo zone. Our algorithm of CSLAM in HOMME is the first one for multiple processor systems and multi-tracers that is highly scalable and effcient.

关键词： transport scheme spherical geometry cubed-sphere grid semi-Lagrangian parallel scalability performance

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Publisher's Note: “Phase locking of a 3.4 THz third-order distributed feedback quantum cascade laser using a room-temperature superlattice harmonic mixer” [Appl. Phys. Lett. 103, 051115 (2013)]

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Applied Physics Letters 2013年第10期103卷

作者： D. J. Hayton A. Khudchenko D. G. Pavelyev J. N. Hovenier A. Baryshev J. R. Gao T. Y. Kao Q. Hu J. L. Reno V. Vaks SRON Netherlands Institute for Space Research 9474 AD Groningen The Netherlands Lobachevskii State University of Nizhny Novgorod Nizhny Novgorod 603950 Russia Kavli Institute of Nanoscience Delft University of Technology Lorentzweg 1 2628 CJ Delft The Netherlands Research Laboratory of Electronics Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology MIT Cambridge Massachusetts 02139 USA CINT Sandia National Laboratories Albuquerque New Mexico 87185-0601 USA Institute for Physics of Microstructures Russian Academy of Sciences Nizhny Novgorod 603950 Russia

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Single-event transient sensitivity to gate bias in InAlSb/InAs/AlGaSb high electron mobility transistors

Single-event transient sensitivity to gate bias in InAlSb/In...

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Indium Phosphide and Related Materials Conference

作者： V. Ramachandran R. D. Schrimpf R. A. Reed E. Zhang X. Shen S. T. Pantelides D. McMorrow J. Brad Boos Department of Electrical Engineering and Computer Science Vanderbilt University Nashville TN Institute for Space and Defense Electronics Vanderbilt University Nashville TN Department of Physics and Astronomy Vanderbilt University Nashville TN Vanderbilt University Law School Nashville TN US Naval Research Laboratory Washington D.C.

We have characterized the single-event transient sensitivity to gate bias of InAlSb/InAs/AlGaSb high electron mobility transistors through experiments and simulations. These depletion-mode transistors exhibit increased charge collection as the gate bias moves from depletion toward threshold, similar to the response observed in floating body silicon-on-insulator devices. Maximum charge collection occurs near threshold, decreasing as the gate bias moves toward accumulation. The interplay between the longitudinal electric field in the channel and the vertical electric field underneath the gate affects the net radiation-generated charge in the InAs channel, which is responsible for the observed experimental trends.

关键词： HEMTs MODFETs Logic gates Transient analysis Integrated circuit modeling Electric fields Electric potential

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Optics and photonics: Key enabling technologies

Optics and photonics: Key enabling technologies

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作者： Willner, Alan E. Byer, Robert L. Chang-Hasnain, Constance J. Forrest, Stephen R. Kressel, Henry Kogelnik, Herwig Tearney, Guillermo J. Townes, Charles H. Zervas, Michalis N. Department of Electrical Engineering University of Southern California Los Angeles CA 90089-2565 United States E.L. Ginzton Laboratory Stanford University Stanford CA 94305-4088 United States Electrical Engineering and Computer Science Department University of California Berkeley Berkeley CA 94720-1770 United States Vice President for Research Ann Arbor MI 48109-1340 United States Warburg Pincus LLC New York NY 10017 United States Bell Labs Alcatel-Lucent Holmdel NJ 07733-0400 United States Harvard Medical School Boston MA 02114 United States Graduate School University of California Berkeley Berkeley CA 94720 United States Optoelectronics Research Centre University of Southampton Highfield Hampshire SO17 1BJ United Kingdom

The fields of optics and photonics have experienced dramatic technical advances over the past several decades and have cemented themselves as key enabling technologies across many different industries. This paper explores past milestones, present state of the art, and future perspectives of several different topics, including: lasers, materials, devices, communications, bioimaging, displays, manufacturing, and industry evolution. © 2012 IEEE.

关键词： Photonics

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Prolog to the section on optics and photonics

Prolog to the section on optics and photonics

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A section of the Centennial Special Issue of the proceedings of the IEEE, entitled 'Optics and Photonics', contains an article in which different topics are included. Many technical advances are measured in terms of orders of magnitude and an ever-growing list exists of industries that are critically enabled by these dramatic advances. Over the past several decades, optics and photonics have cemented themselves as key enabling technologies for a myriad of industries. The paper in this section tries to capture some of the excitement of this field, and it is divided into several different subsections, including: lasers, materials and devices, communications, bioimaging, displays, manufacturing, and the evolution of the photonics industry. Each subsection is divided further into subsections, introduction: context and importance of the topic, past: key past milestones and perspectives, present: state of the art and current thinking, and future: speculative vision into the future.

关键词： Display devices

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Yield enhancement for 3D-stacked ICs: Recent advances and challenges

Yield enhancement for 3D-stacked ICs: Recent advances and ch...

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Asia and South Pacific Design Automation Conference

作者： Qiang Xu Li Jiang Huiyun Li Bill Eklow CUhk REliable Computing Laboratory (CURE) Department of Computer Science & Engineering Chinese University of Hong Kong Hong Kong China Automotive Electronics Research Center Shenzhen Institutes of Advanced Technologies Chinese Academy of Sciences China Cisco Systems Inc. San Jose CA USA

Three-dimensional (3D) integrated circuits (ICs) that stack multiple dies vertically using through-silicon vias (TSVs) have gained wide interests of the semiconductor industry. The shift towards volume production of 3D-stacked ICs, however, requires their manufacturing yield to be commercially viable. Various techniques have been presented in the literature to address this important problem, including pre-bond testing techniques to tackle the “known good die” problem, TSV redundancy designs to provide defect-tolerance, and wafter/die matching solutions to improve the overall stack yield. In this paper, we survey recent advances in this filed and point out challenges to be resolved in the future.

关键词： Through-silicon vias Three dimensional displays Testing Bonding Redundancy Semiconductor device modeling Maintenance engineering

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Ultrafast Photocurrent Measurement of the Escape Time of Electrons and Holes from Carbon Nanotube p−i−n Photodiodes

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Physical Review Letters 2012年第8期108卷 087404-087404页

作者： Nathaniel M. Gabor Zhaohui Zhong Ken Bosnick Paul L. McEuen Laboratory of Atomic and Solid State Physics Cornell University Ithaca New York 14853 USA Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor Michigan 48109 USA National Institute of Nanotechnology National Research Council of Canada Edmonton AB T6G 2M9 Canada Kavli Institute at Cornell for Nanoscale Science Cornell University Ithaca New York 14853 USA

Ultrafast photocurrent measurements are performed on individual carbon nanotube p−i−n photodiodes. The photocurrent response to subpicosecond pulses separated by a variable time delay Δt shows strong photocurrent suppression when two pulses overlap (Δt=0). The picosecond-scale decay time of photocurrent suppression scales inversely with the applied bias VSD, and is twice as long for photon energy above the second subband E22 as compared to lower energy. The observed photocurrent behavior is well described by an escape time model that accounts for carrier effective mass.

关键词： ELECTRIC measurements PHOTOCURRENTS HOLES (Electron deficiencies) CARBON nanotubes PIN diodes NUCLEAR energy EFFECTIVE mass (Physics)

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Reports of the AAAI 2012 conference workshops

Reports of the AAAI 2012 conference workshops

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作者： Agrawal, Vikas Baier, Jorge Bekris, Kostas Chen, Yiling D'Avila Garcez, Artur S. Hitzler, Pascal Haslum, Patrik Jannach, Dietmar Law, Edith Lecue, Freddy Lamb, Luis C. Matuszek, Cynthia Palacios, Hector Srivastava, Biplav Shastri, Lokendra Sturtevant, Nathan Stern, Roni Tellex, Stefanie Vassos, Stavros Center for Knowledge Driven Intelligent Systems Enterprise Technology Research Labs Infosys Limited India Pontificia Universidad Católica de Chile Chile Rutgers University NJ United States Harvard University United States City University London United Kingdom Wright State University Dayton OH United States Australian National University Australia TU Dortmund Germany Machine Learning Department Carnegie Mellon University United States IBM Research - Smarter Cities Technology Centre Dublin Ireland Federal University of Rio Grande do Sul Porto Alegre Brazil Computer Science and Engineering Department University of Washington United States Universidad Carlos III de Madrid Spain IBM Research - India India University of Denver United States Ben Gurion University Negev Israel Computer Science and Artificial Intelligence Laboratory Massachusetts Institute of Technology United States Department of Informatics and Telecommunications National and Kapodistrian University of Athens Athens Greece

The AAAI-12 Workshop program was held Sunday and Monday, July 22-23, 2012, at the Sheraton Centre Toronto Hotel in Toronto, Ontario, Canada. The AAAI-12 workshop program included nine workshops covering a wide range of topics in artificial intelligence. The titles of the workshops were Activity Context Representation: Techniques and Languages, Cognitive Robotics, Grounding Language for Physical systems, Human Computation, Intelligent Techniques for Web Personalization and Recommendation systems, Multiagent Pathfinding, Neural-Symbolic Learning and Reasoning, Problem Solving Using Classical Planners, and Semantic Cities. This article presents short summaries of those events. Copyright © 2012, Association for the Advancement of Artificial Intelligence.

关键词： Problem solving

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Experimental generation of propagating Bessel beams with a low-profile leaky radial waveguide

Experimental generation of propagating Bessel beams with a l...

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European Conference on Antennas and Propagation, EuCAP

作者： Mauro Ettorre Scott M. Rudolph Anthony Grbic Institut dElectronique et de Télécommunications de Rennes UMR CNRS 6164 Université de Rennes Rennes France Naval Research Laboratory Inc. Washington DC DC USA Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

The generation of Bessel beams using a leaky radial waveguide is presented. The radial waveguide consists of a capacitive sheet over a ground plane. It supports an azimuthally invariant leaky-wave mode whose normal electric-field component is a truncated, zeroth-order Bessel function. A vector field approach is employed to derive design relations for the radial waveguide, in contrast to previous works on Bessel beams based on scalar wave theory. A prototype is presented. Electric field measurements and their respective Fourier transforms validate the operation of the prototype as a Bessel-beam launcher. The proposed structure can be used for generating arbitrary zeroth-order propagating Bessel beams at microwave or millimeter-wave frequencies.

关键词： Prototypes Electric variables measurement Impedance Fourier transforms Optical waveguides Vectors Equations

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