Characteristics of photogenerated bipolar terahertz radiation in biased photoconductive switches

Po Lem Lin*, Shyh Feng Chen, Kaung-Hsiung Wu, Jenh-Yih Juang, Tseng Ming Uen, Yih Shung Gou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The characteristics of the optically induced bipolar terahertz (THz) radiation from biased semi-insulating GaAs photoconductive switches were investigated using a free-space electrooptic sampling technique. The emitted radiation shows a nearly symmetrical waveform with a broad-band frequency spectrum spanning over 0.1-3 THz, which displays essentially no dependence on the optical excitation fluence or strength of biased field. However, it does slightly depend on the emitter gap spacing. The dynamics of the emitted THz transient is in agreement with the optically induced ultrafast charge transport process driven by the biased field.

Original languageEnglish
Pages (from-to)L1158-L1160
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume41
Issue number10 B
DOIs
StatePublished - 15 Oct 2002

Keywords

  • Bipolar
  • Free-space electrooptic sampling
  • Photoconductive switches
  • THz radiation
  • Ultrafast laser pulse illumination

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