Terahertz emission from YBa2Cu3O7-δ Josephson junctions excited by femtosecond laser

Takahiro Yoshimura, Toshihiko Kiwa, Masayoshi Tonouchi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We examine both power and bias current dependence of terahertz (THz) emission properties from YBa2Cu3O7-δ (YBCO) Josephson junctions. The junctions coupled to bow-tie antennas are fabricated by Ar ion milling from YBCO thin films grown on MgO bicrystals. We observe the radiation at bias currents from 0 to 50 mA, laser powers from 0 to 250 mW. The radiation amplitude increases with increasing laser power, and the frequency at which the radiation has a maximum amplitude decreases with increasing laser power. These trends are observed regardless of junction voltage. The results suggest that the voltage of the Josephson junction plays a less important role in the THz radiation excited by a femtosecond laser.

Original languageEnglish
Pages (from-to)329-332
Number of pages4
JournalPhysica C: Superconductivity and its applications
Issue number1-4
Publication statusPublished - Sept 2001
Externally publishedYes


  • Femtosecond laser pulse
  • Josephson junction
  • Terahertz radiation
  • YBaCuO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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