Free-space electrooptic sampling of terahertz radiation from optically excited superconducting YBa2Cu3O7-δ thin films

Po Iem Lin*, Kaung-Hsiung Wu, Jenh-Yih Juang, Jiunn-Yuan Lin, T. M. Uen, Y. S. Gou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

The characteristics of photogenerated terahertz radiation from a current-biased superconducting YBa2Cu3O7-δ (YBCO) bow-tie antenna were investigated using a free-space electrooptic sampling technique. Picosecond electromagnetic pulses about 450 fs wide were obtained. The frequency spectrum derived by Fourier transforming the picosecond pulses spans over 0.1-4 THz. The dynamics of the quasi-particles optically induced by the ultrafast laser pulse primarily determines the performances of the transient terahertz radiation generated under different operating parameters. The results indicate a characteristic quasi-particle relaxation time of about 2.5 ps close to the critical temperature Tc, and a faster time at lower temperatures.

Original languageEnglish
Pages (from-to)20-24
Number of pages5
JournalIEEE Transactions on Applied Superconductivity
Volume13
Issue number1
DOIs
StatePublished - 1 Mar 2003

Keywords

  • Femtosecond laser illumination
  • Free-space electrooptic sampling (FSEOS)
  • Nonequilibrium superconductivity
  • Terahertz radiation
  • YBaCuO (YBCO)

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