Ultrafast Optical Response and Terahertz Radiation from High-T_c Superconductor (Special Issue on Basic Properties and Applications of Superconductive Electron Devices)
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概要
- 論文の詳細を見る
New THz radiation devices made of high-T_c superconductors are fabricated and their characteristics are studied in detail. Ultrashort electromagnetic pulses with 〜0.5 ps width have been radiated into free space from current biased devices made of superconducting YBa_2Cu_3O_7 (YBCO) films by exciting with femtosecond laser pulses. The Fourier spectrum of them extends up to 〜3 THz. The radiation mechanism is ascribed to the ultrafast supercurrent modulation by the optical pulses. The THz waveform is analyzed using rate equations describing the relaxation of photoexcited quasiparticles. By the improvement of the device structure and the collecting optics, the radiation power can be increased up to 〜0.5 FLW. A new type THz radiation from YBCO films under an external magnetic field without a transport current is also reported.
- 社団法人電子情報通信学会の論文
- 1997-10-25
著者
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Wada Noboru
The Research Center For Superconducting Materials And Electronics Osaka University
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Sakai Kiyomi
Kansai Advanced Research Center Communications Research Laboratory The Ministry Of Posts And Telecom
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Sakai K
宮崎大
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Hangyo M
Research Center For Superconductor Photonics Osaka University
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Hangyo Masanori
Department Of Applied Physics Osaka University
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Hangyo Masanori
Department Of Physics Faculty Of Science Kyoto University
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TONOUCHI Masayoshi
the Research Center for Superconducting Materials and Electronics, Osaka University
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HANGYO Masanori
the Research Center for Superconducting Materials and Electronics, Osaka University
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TANI Masahiko
the Kansai Advanced Research Center, Communications Research Laboratory
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SAKAI Kiyomi
the Kansai Advanced Research Center, Communications Research Laboratory
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