Enhanced Sub-Picosecond Electromagnetic Radiation from YBa2Cu3O7-.DELTA. Thin-Film Bow-Tie Antennas Excited with Femtoseconds Laser Pulses.

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  • Tani Masahiko
    Kansai Advanced Research Center, Communications Research Laboratory, 588–2 Iwaoka, Nishi–ku, Kobe 651–24, Japan
  • Tonouchi Masayoshi
    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
  • Hangyo Masanori
    Research Center for Superconducting Materials and Electronics, Osaka University, 2–1 Yamadaoka, Suita, Osaka 565, Japan
  • Tomozawa Seiji
    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

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Other Title
  • Enhanced Sub-Picosecond Electromagnetic Radiation from YBa2Cu3O7-δ Thin-Film Bow-Tie Antennas Excited with Femtoseconds Laser Pulses
  • Enhanced Sub-Picosecond Electromagnetic
  • Enhanced Sub-Picosecond Electromagnetic Radiation from YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> Thin-Film Bow-Tie Antennas Excited with Femtoseconds Laser Pulses

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Abstract

We demonstrate the emission of sub-picosecond electromagnetic waves from YBa2Cu3O7-δ thin-film bow-tie antennas. Femtosecond laser-pulse irradiation creates a radiative supercurrent transient in the films, and freely propagated radiation is detected and characterized. The low-frequency component of the radiation was greatly enhanced by using bow-tie antennas instead of dipole antennas. We discuss the antenna effects on both the radiation spectra and the radiation power.

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