Ultrashort Electromagnetic Pulse Radiation from YBCO Thin Films Excited by Femtosecond Optical Pulse.

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  • Tonouchi Masayoshi
    Kansai Advanced Research Center, Communications Research Laboratory, 588–2, Iwaoka, Nishi–ku, Kobe 651–24, Japan
  • Tani Masahiko
    Kansai Advanced Research Center, Communications Research Laboratory, 588–2, Iwaoka, Nishi–ku, Kobe 651–24, Japan
  • Wang Zhen
    Kansai Advanced Research Center, Communications Research Laboratory, 588–2, Iwaoka, Nishi–ku, Kobe 651–24, Japan
  • Sakai Kiyomi
    Kansai Advanced Research Center, Communications Research Laboratory, 588–2, Iwaoka, Nishi–ku, Kobe 651–24, Japan
  • Tomozawa Seiji
    Research Center for Superconducting Materials and Electronics, Osaka University, 2–1, Yamadaoka, Suita, Osaka 565, Japan
  • Hangyo Masanori
    Research Center for Superconducting Materials and Electronics, Osaka University, 2–1, Yamadaoka, Suita, Osaka 565, Japan
  • Murakami Yoshishige
    Research Center for Superconducting Materials and Electronics, Osaka University, 2–1, Yamadaoka, Suita, Osaka 565, Japan
  • Nakashima Shin–ichi
    Department of Applied Physics, Faculty of Engineering, Osaka University, 2–1, Yamadaoka, Suita, Osaka 565, Japan

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  • Ultrashort Electromagnetic Pulse Radiat

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We have observed ultrashort electromagnetic pulse radiation from YBa2Cu3O7-δ thin-film dipole antennas. The supercurrent transient is created by the excitation of the supercarriers into quasiparticles with a femtosecond laser pulse, and freely propagated electromagnetic pulses are measured and characterized. A pulse with 0.5 ps full width at half-maximum was obtained, containing frequency components up to 2.0 THz. A femtosecond time-resolved characterization of the spectra revealed that they strongly depend on the excitation conditions, and the quasiparticle recombination time becomes longer with increase in the excitation intensity. It is also observed that the radiation power increases in proportion to the square of both the bias current and the laser power in the region of weak excitation, which is consistent with the classical theory based on a two-fluid model. In the region of strong excitation, deviation from the classical theory was observed.

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