Faculty Profiles - KIWA Toshihiko

MISC - KIWA Toshihiko

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水素ガスセンサの感応膜の特性評価

山口富治, 紀和利彦, 塚田啓二, 中野定樹, 右高園子, 横沢宏一

電気学会全国大会講演論文集 2005 ( 3 ) 2005

導波路結合型サブテラヘルツ電磁波発生・検出システムの開発

金城隆平, 宮寺達也, 川山巌, 村上博成, 紀和利彦, 塚田啓二, 斗内政吉

応用物理学関係連合講演会講演予稿集 52nd ( 1 ) 2005

テラヘルツ波を用いた水素センサー評価システムの構築

紀和利彦, 塚田啓二, 鈴木正人, 斗内政吉, 右高園子, 横沢宏一

応用物理学関係連合講演会講演予稿集 52nd ( 3 ) 2005

空間結合型サブテラヘルツ電磁波発生・検出システムの開発

川山厳, 宮寺達也, 村上博成, 紀和利彦, 塚田啓二, 斗内政吉

応用物理学関係連合講演会講演予稿集 52nd ( 1 ) 2005

テラヘルツ電磁波による水素センサー特性評価

紀和利彦, 塚田啓二, 鈴木正人, 斗内政吉, 右高園子, 横沢宏一

電気学会全国大会講演論文集 2005 ( 3 ) 2005

磁気センサーを用いた金属検出器の開発

河田知明, 紀和利彦, 塚田啓二

電気学会全国大会講演論文集 2005 ( 2 ) 2005

生体内誘導電流の磁気的計測方法

塚田啓二, 紀和利彦

日本ME学会大会論文集 44th 2005

磁気センサを用いた生体内誘導電流の計測

塚田啓二, 紀和利彦

電気学会全国大会講演論文集 2005 ( 2 ) 2005

低周波磁場照射による生体内の誘導電流の磁気的計測

塚田啓二, 紀和利彦

応用物理学関係連合講演会講演予稿集 52nd ( 1 ) 2005

THz time domain spectroscopy of pulsed laser deposited BaTiO <inf>3</inf> thin films

M. Misra, K. Kotani, T. Kiwa, I. Kawayama, H. Murakami, M. Tonouchi

Applied Surface Science 237 ( 1-4 ) 421 - 426 2004.10

Language：English Publisher：ELSEVIER SCIENCE BV

We have measured the dielectric properties of pulsed laser deposited 1.1μm thick BaTiO 3 (BTO) thin films on MgO substrate in the MHz and THz frequency region. The properties of two BTO thin films deposited at substrate temperature 790 and 840°C have been studied. X-ray diffraction pattern and AFM measurement of the films shows that the BTO film grown at temperature 840°C has better epitaxial growth and smooth surface compared to the film grown at 790°C. The dielectric properties of thin films have been measured by THz time domain spectroscopy (THz-TDS) in the frequency range from 0.3 to 2.5THz and by interdigital electrode measurement in the region from 10kHz to 10MHz. The BTO thin film deposited at higher temperature has a higher dielectric constant and tunability in the MHz frequency range whereas at THz frequencies the real and imaginary part of the refractive index and dielectric constant of both films show almost similar behavior. © 2004 Elsevier B.V. All rights reserved.

DOI： 10.1016/S0169-4332(04)01012-8

Ultrafast optical study of amorphous Ge thin films for superconductor/ semiconductor hybrid devices

T. Miyadera, T. Kiwa, I. Kawayama, H. Murakami, M. Tonouchi

Physica C: Superconductivity and its Applications 412-414 ( SPEC. ISS. ) 1602 - 1606 2004.10

Language：English Publisher：ELSEVIER SCIENCE BV

We investigated the optical response of amorphous (a-) Ge thin films by a time-resolved reflectivity measurement and the observation of terahertz radiation from a-Ge photoconductive switch coupled with Au/Cr transmission lines. The results show that the lifetime of photocarrier in the a-Ge is about 0.9 ps, and the pulse width of terahertz beam radiated from the photoconductive switch is about 1 ps. These results indicate that a-Ge can be used as an optical-to-electrical converter in sub-terahertz frequency range. However, the peak width of a-Ge photoconductive switches with YBCO transmission lines is about 2 ps and broad compared with the result with Au/Cr transmission lines. © 2004 Published by Elsevier B.V.

DOI： 10.1016/j.physc.2003.12.089

Real-time monitoring of a photomixing signal using a high-T<inf>C</inf> Josephson junction

Toshihiko Kiwa, Masayoshi Tonouchi

Superconductor Science and Technology 17 ( 8 ) 998 - 1002 2004.8

Language：English Publisher：IOP PUBLISHING LTD

An optical-microwave conversion system has been proposed as a high-stability oscillator in the microwave and millimetre-wave frequency region. A photomixer with heterodyne mixing of two lasers was applied to generate electromagnetic waves and a high-TC grain boundary Josephson junction detector was used to monitor the frequency of the electromagnetic waves in real time. We described the system in detail; it employed a sealed optical connector to introduce the optical signal directly into the cryostat.

DOI： 10.1088/0953-2048/17/8/008

Terahertz radiation from InAs/Al<inf>x</inf>Ga<inf>1-x</inf>Sb (x = 0.5) heterostructures

Masato Suzuki, Toshihiko Kiwa, Masayoshi Tonouchi, Yoji Nakajima, Shigehiko Sasa, Masataka Inoue

Physica E: Low-Dimensional Systems and Nanostructures 22 ( 1-3 ) 574 - 577 2004.4

Language：English Publisher：ELSEVIER SCIENCE BV

We observed terahertz radiation from InAs/Al0.5Ga 0.5Sb heterostructures excited by femtosecond pulses of mode-locked Ti:sapphire laser in the temperature range of 20-300 K. The radiation pseudo-reflected is monitored in time domain by a low temperature grown GaAs photoswitch. Although the waveforms are almost identical irrespective of temperatures, their maximum amplitude is strongly temperature dependent and peaks at around 100 K. Laser power dependence of the amplitude indicates that the excitation at power densities above 57 W/cm2 induce saturation presumably due to screening effect. © 2003 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.physe.2003.12.073

An imaging and quantitative analysis technique for diagnosis of electro-pysiological excitation abnormality of heart

K. Tsukada, K. Ogata, T. Miyashita, S. Yamada, H. Horigome, J. Shiono, T. Kiwa, A. Kandori, I. Yamaguchi

Proceedings of the 14th International Conference on Biomagnetism 2004

A DEVELOPMENT OF MEASURING SYSTEM OF INDUCED CURRENT IN HUMAN BODY DUE TO LOW FREQUENCY ELECTROMAGNETIC IRRADIATION

Keiji Tsukada, Toshihiko Kiwa

Proceedings of Biological Effects of EMFs, 3rd International Workshop 2004

LSI故障解析用レーザーテラヘルツエミッション顕微鏡の開発レーザーテラヘルツエミッション顕微鏡による集積回路観察

山下将嗣, 紀和利彦, 斗内政吉, 二川清, 大谷知行, 川瀬晃道

マイクロファブリケーション研究の最新動向 15 2004

ジョセフソン接合を用いたフォトミキシング電磁波周波数検出・安定化システム

紀和利彦, 斗内政吉

応用物理学関係連合講演会講演予稿集 51st ( 3 ) 2004

運動負荷による心臓磁場変化の解析

塩田隆雄, 紀和利彦, 塚田啓二, 緒方邦臣, 宮下豪, 神鳥明彦

日本ME学会秋季大会論文集 18th 2004

光ファイバ結合型コンパクトテラヘルツ分光ヘッドの開発

大野恭裕, 紀和利彦, 斗内政吉

応用物理学関係連合講演会講演予稿集 51st ( 3 ) 2004

光ファイバ結合型コンパクトテラヘルツ分光システムの構築

大野恭裕, 井上亮太郎, 紀和利彦, 塚田啓二, 斗内政吉

応用物理学会学術講演会講演予稿集 65th ( 3 ) 2004

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