Novel Terahertz Radiation from Flux-Trapped YBa2Cu3O7-.DELTA. Thin Films Excited by Femtosecond Laser Pulses.

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  • Tonouchi Masayoshi
    Kansai Advanced Research Center, Communications Research Laboratory, Iwaoka, Nishi–ku, Kobe 651–24, Japan
  • Tani Masahiko
    Kansai Advanced Research Center, Communications Research Laboratory, Iwaoka, Nishi–ku, Kobe 651–24, Japan
  • Wang Zhen
    Kansai Advanced Research Center, Communications Research Laboratory, Iwaoka, Nishi–ku, Kobe 651–24, Japan
  • Sakai Kiyomi
    Kansai Advanced Research Center, Communications Research Laboratory, Iwaoka, Nishi–ku, Kobe 651–24, Japan
  • Wada Noboru
    Research Center for Superconducting Materials and Electronics, Osaka University, Yamadaoka, Suita, Osaka 565, Japan
  • Hangyo Masanori
    Research Center for Superconducting Materials and Electronics, Osaka University, Yamadaoka, Suita, Osaka 565, Japan

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  • Novel Terahertz Radiation from Flux-Trapped YBa2Cu3O7-δ Thin Films Excited by Femtosecond Laser Pulses
  • Novel Terahertz Radiation from Flux-Tra
  • Novel Terahertz Radiation from Flux-Trapped YBa<sub> 2</sub>Cu<sub> 3</sub>O<sub> 7-</sub> <sub>δ</sub> Thin Films Excited by Femtosecond Laser Pulses

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Abstract

We discovered a new type of terahertz (THz) radiation from YBa2Cu3O7-δ thin films. Ultrashort electromagnetic pulses, which are referred to as THz radiation, were emitted into free space by irradiating the superconductive films with femtosecond laser pulses. The THz radiation, with a spectrum extending from 0.1 to 3 THz, was excited in both the films applied with a magnetic field and the flux-trapped films. The results suggest that the screening current for the external magnetic field and circulating current around the trapped flux play an important role in the emission mechanism.

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