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Second-harmonic double-resonance cones in dispersive hyperbolic metamaterials

Physical Review B 2014年第7期89卷 075123-075123页

作者： Domenico de Ceglia Maria Antonietta Vincenti Salvatore Campione Filippo Capolino Joseph W. Haus Michael Scalora National Research Council–AMRDEC Charles M. Bowden Research Laboratory Redstone Arsenal Alabama 35898 USA Department of Electrical Engineering and Computer Science University of California Irvine California 92697 USA Electro-Optics Program University of Dayton 300 College Park Dayton Ohio 45469 USA Charles M. Bowden Research Laboratory AMRDEC U.S. Army RDECOM Redstone Arsenal Alabama 35898 USA

We study the formation of second-harmonic double-resonance cones in hyperbolic metamaterials. An electric dipole on the surface of the structure induces second-harmonic light to propagate into two distinct volume plasmon-polariton channels: a signal that propagates within its own peculiar resonance cone and a phase-locked signal that is trapped under the pump's resonance cone. Metamaterial dispersion and birefringence induce a large angular divergence between the two volume plasmon polaritons, making these structures suitable for subwavelength second- and higher-harmonic imaging microscopy.

关键词： HARMONICS (Electric waves) DISPERSION (Atmospheric chemistry) HYPERBOLIC processes PLASMONS (Physics) POLARITONS

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Erratum: 'A Measurement of the Cosmic Microwave Background B-Mode Polarization Power Spectrum at Sub-degree Scales with POLARBEAR' (2014, ApJ, 794, 171)

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The Astrophysical Journal 2017年第1期848卷

作者： The Polarbear Collaboration: P. A. R. Ade Y. Akiba A. E. Anthony K. Arnold M. Atlas D. Barron D. Boettger J. Borrill S. Chapman Y. Chinone M. Dobbs T. Elleflot J. Errard G. Fabbian C. Feng D. Flanigan A. Gilbert W. Grainger N. W. Halverson M. Hasegawa K. Hattori M. Hazumi W. L. Holzapfel Y. Hori J. Howard P. Hyland Y. Inoue G. C. Jaehnig A. H. Jaffe B. Keating Z. Kermish R. Keskitalo T. Kisner M. Le Jeune A. T. Lee E. M. Leitch E. Linder M. Lungu F. Matsuda T. Matsumura X. Meng N. J. Miller H. Morii S. Moyerman M. J. Myers M. Navaroli H. Nishino A. Orlando H. Paar J. Peloton D. Poletti E. Quealy G. Rebeiz C. L. Reichardt P. L. Richards C. Ross I. Schanning D. E. Schenck B. D. Sherwin A. Shimizu C. Shimmin M. Shimon P. Siritanasak G. Smecher H. Spieler N. Stebor B. Steinbach R. Stompor A. Suzuki S. Takakura T. Tomaru B. Wilson A. Yadav O. Zahn School of Physics and Astronomy Cardiff University Cardiff CF10 3XQ UK The Graduate University for Advanced Studies Hayama Miura District Kanagawa 240-0115 Japan Center for Astrophysics and Space Astronomy University of Colorado Boulder CO 80309 USA Department of Astrophysical and Planetary Sciences University of Colorado Boulder CO 80309 USA Department of Physics University of California San Diego CA 92093-0424 USA Computational Cosmology Center Lawrence Berkeley National Laboratory Berkeley CA 94720 USA Space Sciences Laboratory University of California Berkeley CA 94720 USA Department of Physics and Atmospheric Science Dalhousie University Halifax NS B3H 4R2 Canada Department of Physics University of California Berkeley CA 94720 USA High Energy Accelerator Research Organization (KEK) Tsukuba Ibaraki 305-0801 Japan Physics Department McGill University Montreal QC H3A 0G4 Canada AstroParticule et Cosmologie Univ Paris Diderot CNRS/IN2P3 CEA/Irfu Obs de Paris Sorbonne Paris Cité France International School for Advanced Studies (SISSA) Trieste 34014 Italy Department of Physics Columbia University New York NY 10027 USA Rutherford Appleton Laboratory STFC Swindon SN2 1SZ United Kingdom Department of Physics University of Colorado Boulder CO 80309 USA Kavli Institute for the Physics and Mathematics of the Universe (WPI) Todai Institutes for Advanced Study The University of Tokyo Kashiwa Chiba 277-8583 Japan Department of Physics University of Oxford Oxford OX1 2JD UK Physics Department Austin College Sherman TX 75090 USA Department of Physics Imperial College London London SW7 2AZ UK Department of Physics Princeton University Princeton NJ 08544 USA Physics Division Lawrence Berkeley National Laboratory Berkeley CA 94720 USA Department of Astronomy and Astrophysics University of Chicago Chicago IL 60637 USA Kavli Institute for Cosmological Physics University of Chicago Chicago IL 60637 USA Department of Physics and Astronomy

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Time response of bragg gratings in microstructured polymer optical fiber

Time response of bragg gratings in microstructured polymer o...

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22nd International Conference on Plastical Optical Fibers , POF 2013

作者： Marques, Carlos A.F. Bilro, Lúcia B. Ferreira, Ricardo X. Pohl, Alexandre A.P. Nogueira, Rogério N. Instituto de Telecomunicações Pólo de Aveiro 3810-193 Aveiro Portugal Graduate School of Electrical Engineering and Computer Science Federal University of Technology-Paraná Curitiba Brazil

The time response of Bragg gratings is of great concern in the design of fast photonic devices. In this work the time response of gratings written in microstructured polymer optical fiber (mPOF) is assessed using flexural acoustic waves. The excitation is achieved by means of an acousto-optic modulator (AOM), which is composed by a piezoelectric transducer, a silica horn and the mPOF containing a Bragg grating. A comparison of the time response between gratings with different lengths written in the polymer fiber is performed and discussed, when the same acoustic regime (flexural waves) is applied to the fiber.

关键词： Silica

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Enabling robots to make use of the structure of human actions - A user study employing Acoustic Packaging

Enabling robots to make use of the structure of human action...

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22nd IEEE International Symposium on Robot and Human Interactive Communication: "Living Together, Enjoying Together, and Working Together with Robots!", IEEE RO-MAN 2013

作者： Lohse, Manja Wrede, Britta Schillingmann, Lars Faculty of Electrical Engineering Mathematics and Computer Science University of Twente 7500 AE Enschede Netherlands Faculty of Technology Bielefeld University 33615 Bielefeld Germany Graduate School of Engineering Osaka University 565-0871 Osaka Japan

ISBN: (纸本)9781479905072

Human learning strongly depends on the ability to structure the actions of teachers in order to identify relevant parts. We propose that this is also true for learning in robots. Therefore, we apply a method for multimodal action segmentation called Acoustic Packaging to a corpus of pairs of users teaching object names to a robot. Going beyond previous use cases, we analyze how the structure of human actions changes if the robot is learning quickly or slowly. Our results reveal differences between action structuring in the conditions such as longer utterances and more motion when the robot learns slowly. We also evaluate how the partners in the pair influence each other's action structuring. The results show a strong correlation between the participants in the pairs, even more so in the trials where the robot is learning slowly. We conclude that the action structuring based on Acoustic Packaging allows robots to differentiate how well the interaction with multiple users is going and is, thus, a vehicle for feedback generation. © 2013 IEEE.

关键词： Robots

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A reconfigurable ray-tracing Multi-Processor SoC with hardware replication-aware instruction set extension

A reconfigurable ray-tracing Multi-Processor SoC with hardwa...

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13th International Conference on Algorithms and Architectures for Parallel Processing, ICA3PP 2013

作者： Nery, Alexandre S. Nedjah, Nadia França, Felipe M.G. Jozwiak, Lech Corporaal, Henk LAM - Computer Architecture and Microeletronics Laboratory Systems Engineering and Computer Science Program COPPE Federal University of Rio de Janeiro Brazil Department of Electronics Engineering and Telecommunications Faculty of Engineering State University of Rio de Janeiro Brazil Department of Electrical Engineering - Electronic Systems Eindhoven University of Technology Netherlands

ISBN: (纸本)9783319038582

Application code and processor parallelization, together with instruction set customization, are the most common and effective ways to enhance the performance and efficiency of application-specific processors (ASIPs). Both the effective code parallelization and data/task parallelism exploitation, as well as effective instruction set customization, enable an ASIP to achieve a significant performance improvement using limited extra hardware resources. However, a naive parallelization or instruction set customization may not result in the required performance improvement, leading to a waste of computing and energy resources. Therefore, when performing parallelization or custom instruction selection, complex tradeoffs between processing speed, circuit area and power consumption must be closely observed. In this paper, we propose and discuss an efficient ASIP-based Multi-Processor System-on-a-Chip (MPSoC) design for ray-tracing, exploiting application parallelism and hardware replication-aware instruction set customization. Without hardware sharing among the custom instructions units, the proposed parallel ray-tracer MPSoC design with custom instructions achieves 77% speed up in comparison to a single microprocessor design with the default instruction set. However, with the replication-aware instruction set customization, the speed up increases to 81%. © Springer International Publishing Switzerland 2013.

关键词： Integrated circuit design

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A portable and low cost solution for EMG using ZigBee, GPRS and Internet to Biomedical applications

A portable and low cost solution for EMG using ZigBee, GPRS ...

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19th IMEKO TC4 Symposium - Measurements of electrical Quantities 2013 and 17th International Workshop on ADC and DAC Modelling and Testing

作者： Silva, D.K.N. Sato, R.M.V. Castro, A.L.S. Electrical Engineering Post Graduate Program Av. Augusto Correa 01 66075-110 Belém - Pará Brazil Faculty of Computer and Telecommunication Engineering Av. Augusto Correa 01 66075-110 Belém - Pará Brazil

ISBN: (纸本)9781629931890

This paper presents a prototype of an acquisition board of electromyographic signals (EMG);an embedded portable, wireless and low cost solution. The system is composed of an EMG acquisition board, Zigbee modules and a device named GPRSx. After acquiring the EMG signal, it is sent through ZigBee wireless technology to GPRSx device. The GPRSx device sends the EMG signal to a server on the Internet by using GPRS wireless technology. Thus, the EMG signal is displayed in a graph on a remote computer. The results are very promising and may serve as a reference in studies for the biomedical area.

关键词： Costs

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Bandwidth enhancement of circular polarization generated from circular waveguide and L-shaped probe

Bandwidth enhancement of circular polarization generated fro...

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IEEE International Workshop on Electromagnetics, Applications and Student Innovation (iWEM)

作者： Takeshi Fukusako Naoya Noguchi Shingo Yamaura Graduate School of Computer Science and Electrical Engineering Kumamoto University Kumamoto Japan

A combination of an L-shaped probe and square waveguide generates circular polarization. In this paper, the authors reports a generation by a L-shaped probe and a circular waveguide. Furthermore, a reduction of the higher-order TM mode limiting the bandwidth in axial ratio and impedance characteristics is discussed. Finally, validity as a CP-UWB antenna is also discussed.

关键词： Probes ISO standards Broadband communication Broadband antennas

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Isolated large bipolar pulse (ILBP) produced by lightning discharge in winter thunderstorm

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IEEJ Transactions on Fundamentals and Materials 2013年第9期133卷 451-457页

作者： Wu, Ting Takayanagi, Yuji Funaki, Tsuyoshi Yoshida, Satoru Ushio, Tomoo Kawasaki, Zen-Ichiro Morimoto, Takeshi Nakamura, Yoshitaka Division of Electrical Electronic and Information Engineering Graduate School of Engineering Osaka University 2-1 Yamada-oka Suita 565-0871 Japan Communications and Computer Engineering Egypt- Japan University of Science and Technology P.O.Box 179 New Borg El-Arab City 21934 Alexandria Egypt Department of Electric and Electronic Engineering Faculty of Science and Engineering Kinki University 3-4-1 Kowakae Higashiosaka Osaka 577-8502 Japan Department of Electrical Engineering Kobe City College of Technology 8-3 Gakuen Higashi Nishi-ku Kobe 651-2194 Japan

We present the first analysis of a type of special lightning discharge event, called "isolated large bipolar pulse" (ILBP), produced in winter thunderstorm. ILBP produces single bipolar electric field change waveforms with pulse widths mainly in the range of 7 to 19 μs. The initial positive half cycle and the negative cycle of the bipolar pulse are symmetrical with each other to some extent. ILBP is also a very energetic discharge process, producing very large electric field changes even larger than that produced by positive return strokes. Most of ILBPs are found to be isolated with other discharge processes on a time scale of 1 second, but a few ILBPs also seem to be the initiation of other discharge processes. Based on the similarities and differences between ILBP, narrow bipolar pulse (NBP) and negative return stroke (RS) in winter thunderstorm, we discuss the possibility of ILBP as a special version of NBP in winter thunderstorm and as a special type of negative RS. © 2013 The Institute of electrical Engineers of Japan.

关键词： Thunderstorms

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CMOS-BASED TACTILE SENSORS USING OXIDE AS SACRIFICIAL LAYER

CMOS-BASED TACTILE SENSORS USING OXIDE AS SACRIFICIAL LAYER

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International Conference on Solid-State Sensors, Actuators and Microsystems

作者： Y.-C. Lin C.-J. Hsieh C.-T. Sun J.-C. Liou W.-C. Tian Graduate Institute of Electronics Engineering College of Electrical Engineering and Computer Science National Taiwan University

ISBN: (纸本)9781467359825

In this work, CMOS-based tactile sensors using oxide as the sacrificial layer was demonstrated. The multiple metal layers and dielectric layers in the backend of CMOS processes were used to fabricate the moveable membrane of capacitive-based tactile sensors. The sensor was fabricated by the commercial 0.35 μm CMOS process and our self-developed post CMOS oxide etching. Three different via designs were proposed to adjust mechanical strength of the membrane electrode. A multivibrator circuit was utilized to decrease the parasitic effect of the capacitive sensors. The tactile sensors with point-type vias showed the best sensitivity of 2.65 Hz/mmHg with the dynamic range 0-388 mmHg.

关键词： CMOS MEMS tactile sensor pressure sensor oxide etching multivibrator circuit

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FFT based automatic species identification improvement with 4-layer neural network

FFT based automatic species identification improvement with ...

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International Symposium on Communications and Information Technologies (ISCIT)

作者： Rong Sun Yihenew Wondie Marye Hua-An Zhao Graduate School of Science and Technology Computer Science and Electrical Engineering Department Kumamoto University Japan

In this paper, an automatic species identification system has been developed. Recoded data was segmented, processed, features taken out, and identified by an automatic operation. A feature quantity method based on FFT with derivative of frequency band power making use of 4-layer neural network is proposed. Comparison of the results with the 4-layer neural network has been performed on wild bird species identification based on sound data which has proved promising.

关键词： Birds Neural networks Frequency modulation Frequency conversion Frequency-domain analysis Feature extraction

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