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International Conference on infrared and Millimeter Waves

作者： Satoshi Tsuzuki Tomohiro Nagase Daiki Takeshima Tetsuya Kinoshita Kazuki Horita Christopher T. Que Elmer Estacio Michael I. Bakunov Kodo Kawase Kazuyoshi Kurihara Fumiyoshi Kuwashima Takashi Furuya Kohji Yamamoto Seizi Nishizawa Masahiko Tani Research Center for Development of Far-Infrared Region University of Fukui Fukui Japan University of Nizhni Novgorod Nizhny Novgorod Russia University of Nagoya Nagoya Japan Faculty of Education and Regional Studies University of Fukui Japan Department of Electrical and Electronics Engineering Fukui University of Technology Japan

We have observed a significant enhancement in the electro-optic sampling efficiency for THz radiation by using focusing effect in a metallic tapered parallel plate waveguide and also an optical waveguide in LiNbO3 employed as an EO crystal. The total enhancement factor exceeds an order of magnitude as compared to the case with a bulk LiNbO3 crystal coupled with a Si prism.

关键词： Electrooptical waveguides Crystals Optical sensors Probes Ultrafast optics Optical beams

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Generation of a wide range and stable THz wave using an optical fiber and a laser chaos

Generation of a wide range and stable THz wave using an opti...

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International Conference on infrared and Millimeter Waves

作者： F. Kuwashima T. Shirao M. Tani K. Kurihara K. Yamamoto M. Hangyo T. Nagashima Hiroshi Iwasawa Department of Electrical Electronics and Computer Engineering Fukui University of Technology Fukui Japan Research Center for Development of Far-Infrared Region University of Fukui Fukui Japan Faculty of Education and Regional Studies University of Fukui Fukui Japan Institute of Laser Engineering Osaka University Osaka Japan University of Fukui Fukui Japan

Generation of a wide-range THz wave from a photoconductive antenna excited by a multimode semiconductor chaotic oscillation laser with an optical delayed feedback using an external mirror is investigated. An optical fiber is also used for easy alignment. The properties of the generated THz wave are compared with those of generated THz wave by using a CW steady state laser.

关键词： Fiber lasers Laser excitation Laser feedback Semiconductor lasers Laser stability Laser modes

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Superfocusing effect of V-groove metallic structure for terahertz wave

Superfocusing effect of V-groove metallic structure for tera...

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2011 International Quantum Electronics Conference, IQEC 2011 and Conference on Lasers and Electro-Optics, CLEO Pacific Rim 2011

作者： Tsuzuki, Satoshi Kurihara, Kazuyoshi Kuwashima, Fumiyoshi Furuya, Takashi Yamamoto, Kohji Tani, Masahiko Research Center for Development of Far-Infrared Region University of Fukui Japan Faculty of Education and Regional Studies University of Fukui Japan Department of Electrical and Electronics Engineering Fukui University of Technology Japan

ISBN: (纸本)9780977565771

Focusing THz waves into a sub-wavelength area is a crucial issue for THz spectroscopy of minute samples and also for high-spatial resolution THz-imaging. Recently, super-focusing phenomena of THz waves, or more generally, those of electromagnetic waves are under intense investigation with theoretical and experimental studies using tapered metallic waveguiding structures. In this report we present our experimental study on a super-focusing effect of a V-groove metallic structure for THz pulsed waves with an opening angle about 10 degrees. Without coupling substrate lens, a 17% amplitude transmission of THz broadband waves (0∼2.5 THz) through a 2-μm bottom-width was observed without significant waveform distortion and phase delay. © 2011 IEEE.

关键词： Terahertz waves

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Superfocusing effect of V-groove metallic structure for terahertz wave

Superfocusing effect of V-groove metallic structure for tera...

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International Conference on Quantum Electronics (IQEC)

作者： Satoshi Tsuzuki Kazuyoshi Kurihara Fumiyoshi Kuwashima Takashi Furuya Kohji Yamamoto Masahiko Tani Research Center for Development of Far-Infrared Region University of Fukui Japan Faculty of Education and Regional Studies University of Fukui Japan Department of Electrical and Electronics Engineering Fukui University of Technology Japan

ISBN: (纸本)9780977565771

Focusing THz waves into a sub-wavelength area is a crucial issue for THz spectroscopy of minute samples and also for high-spatial resolution THz-imaging. Recently, super-focusing phenomena of THz waves, or more generally, those of electromagnetic waves are under intense investigation with theoretical and experimental studies using tapered metallic waveguiding structures. In this report we present our experimental study on a super-focusing effect of a V-groove metallic structure for THz pulsed waves with an opening angle about 10 degrees. Without coupling substrate lens, a 17% amplitude transmission of THz broadband waves (0~2.5 THz) through a 2-μm bottom-width was observed without significant waveform distortion and phase delay.

关键词： Metals Focusing Spectroscopy Laser beams Optical waveguides Measurement by laser beam Phase distortion

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Superfocusing of terahertz waves in V-groove metallic structure

Superfocusing of terahertz waves in V-groove metallic struct...

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International Conference on infrared and Millimeter Waves

作者： Satoshi Tsuzuki Kazuyoshi Kurihara Fumiyoshi Kuwashima Takashi Furuya Kohji Yamamoto Masahiko Tani Research Center of Development of Far-Infrared Region University of Fukui Fukui Japan Faculty of Education and Regional Studies University of Fukui Fukui Japan Department of Electrical and Electronics Engineering Fukui University of Technology Fukui Japan

In this report we present our experimental study on a super-focusing effect of a V-groove metallic structure for THz pulsed waves. Without using coupling lens, a 17% amplitude transmission of THz broadband waves (0~2.... 详细信息

关键词： Laser beams Metals Optical waveguides Measurement by laser beam Antennas Optical surface waves Educational institutions

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New category of the frustrated quantum magnets composed of spin-1/2 triple-chains

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Journal of Physics: Conference Series 2011年第1期320卷

作者： Masashi Fujisawa Hikomitsu Kikuchi Yutaka Fujii Seitaro Mitsudo Akira Matsuo Koichi Kindo Headquarters for the Advancement of High Priority Research University of Fukui Fukui 910-8507 Japan Present address: Research Center for Low Temperature Physics Tokyo Institute of Technology Tokyo Department of Applied Physics University of Fukui Fukui 910-8507 Japan Research Center for Development of Far-Infrared Region University of Fukui Fukui 910-8507 Japan Institute for Solid State Physics University of Tokyo Kashiwa Chiba 277-8581 Japan

Cu3(OH)4MO4, which is a natural mineral szenicsite, has been studied by the magnetic susceptibility, the specific heat, and the high field magnetization measurement. This compound consists of S = 1/2 triple-chain of the edge-sharing octahedra CuO6. On the basis of the crystal structure in szenicsite, spin frustration can strongly affect the ground state. The magnetic susceptibility has a broad maximum around 80 K, which is characteristic of the quasi-one-dimensional antiferromagnet. There are no sign of magnetic phase transitions from 300 K down to 2 K in our measurements. The magnetization curve measurement up to 48 T at 1.3 K indicates that neither magnetic order nor spin gap is present. Assuming the triple-chains as the isolated uniform chains, we estimated the dominant exchange interaction J/kB = −66 K.

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Theoretical investigation of a high efficiency and broadband sub-terahertz gyrotron

Theoretical investigation of a high efficiency and broadband...

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International Conference on infrared and Millimeter Waves

作者： Nai-Ching Chen Tsun-Hsu Chang Ching-Pin Yuan Toshitaka Idehara Isamu Ogawa Department of Physics National Tsing Hua University Hsinchu Taiwan Research Center for Development of for Infrared Region Fukui University of Technology Fukui Japan

This study investigates the electron dynamics of gyrotron interaction in a tapered waveguide and proposes an interaction structure for a 0.2-THz TE 02 reflective gyrotron backward-wave oscillator (gyro-BWO). The design shows the advantages of high power, continuous and broadband frequency tuning, mode converter free, and inherently possesses mode-selective ability to suppress the potentially competing TE 22 mode. Calculated results indicate that the reflective TE 02 gyro-BWO is capable of generating a peak power of 3.3 kW corresponding to 26.3% interacting efficiency with a broad 3dB-tuning-bandwidth of 6.9 GHz at beam current I b = 0.5 A and beam voltage V b = 25 kV.

关键词： Gyrotrons Tuning Cavity resonators Broadband communication Radio frequency Magnetic fields Resonant frequency

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Emission of terahertz radiation from dipole photoconductive antennas with several geometrical parameters

Emission of terahertz radiation from dipole photoconductive ...

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International Conference on infrared and Millimeter Waves

作者： F. Miyamaru K. Yamamoto T. Furuya S. Nishizawa M. Tani Department of Physics Faculty of Science Shinshu University Matsumoto Nagano Japan PRESTO Japan Science and Technology Agency Sendai Japan Research Center for Development of Far-Infrared Region University of Fukui Bunkyo Fukui Japan Advanced Infrared Spectroscopy Company Limited Hachioji Tokyo Japan

The dependence of the emission spectrum of terahertz (THz) radiation on the geometrical parameters of the dipole antenna, and the relationship between these parameters and the temporal characteristics of the transient input field is reported. The emission intensity and the peak frequency strongly depend on these geometrical parameters.

关键词： Dipole antennas Electric fields Transient analysis Lasers Resonant frequency Physics

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development of THz gyrotron FU CW III using a 20 T superconducting magnet

Development of THz gyrotron FU CW III using a 20 T supercond...

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International Conference on infrared and Millimeter Waves

作者： K. Kosuga T. Idehara R. Ikeda Y. Tatematsu I. Ogawa S. Mitsudo T. Saito La Agusu J. C. Mudiganti M. Thumm Research Center for Development of Far-Infrared Region University of Fukui Fukui-shi Japan Department of Physics Haluoleo University Kendari Indonesia Association EURATOM KIT Institute für hochfrequenztecnik und Elektronik Institut für Hochfrequenztechnik und Hlektronik Kaiserstr Karlsruhe Institute of Technology Karlsruhe Germany Karlsruhe Institute of Thchnology Association EURATOM-KIT Institute fiir hochfrequenztecnik und Elektronik Institut fiir Hochfrequenztechnik and Hlektronik Karlsruhe Germany

A Gytrotron FU CW III using a 20 T superconducting magnet has been developed as a radiation source in the THz region. At the first experiment, several radiation by fundamental operation were observed and measured freq... 详细信息

关键词： Gyrotrons Frequency measurement Magnetic field measurement Power harmonic filters Harmonic analysis Magnetic fields Power generation

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Proceedings of The 28th Annual Meeting of the Japan Human Cell Society 23 August 2009 Tsukuba, Ibaraki, Japan Abstracts

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HUMAN CELL 2010年第3期23卷 A1-A8页

作者： [Anonymous] Division of Gastroenterology University of Tsukuba Graduate School of Comprehensive Human Sciences Japan Laboratory of Rare Disease Biospecimen Department of Disease Bioresources Research National Institute of Biomedical Innovation Japan Cell Engineering Division RIKEN BioResource Center Japan Department of Cell Modulation Institute of Molecular Embryology and Genetics (IMEG) Kumamoto University Japan National Institute of Biomedical Innovation Department of Disease Bioresource Research Office of Policy and Ethics Research Laboratory of Rare Disease Biospecimen Japan Frontier Research Center Tokyo Institute of Technology Japan Department of Reproductive Biology National Research Institute for Child Health and Development Japan Stem Cell Bank Section Center for Stem Cell Biology and Regenerative Medicine The Institute of Medical Science The University of Tokyo Tokyo Japan Institute of Cell Biology Ishiwata Hospital Japan Ishiwata Obstet. and Gynecol Hospital Japan Department of Developmental of Regenerative Dentistry School of Life Dentistry at Tokyo The Nippon Dental University Japan Department of Developmental of Regenerative Dentistry Japan School of medicine The Jikei University Japan Central Clinic Japan Kuroda Hospital Japan ALOKA Co. Ltd. Japan Laboratory of Regenerative Medical Sciences School of Life Dentistry at Tokyo The Nippon Dental University Japan Department of Pathology Section of Oncopathology and Regenerative Biology Japan Laboratory of Regenerative Medical Sciences Japan Section of Neurosurgery Department of Clinical Neuroscience Faculty of medicine University of Miyazaki Japan The Institute for Advanced Reproductive Medical Technology Japan Department of Urology Yokohama City University Graduate School of Medicine Japan The Jkei University Japan Research Center for Odontology The Nippon Dental University School of Life Dentistry at Tokyo Japan Cytopathology and Gynecology Osaka Cancer Prevention and Detection Center Osaka Central Laboratory O

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