Ultrafast optical study of amorphous Ge thin films for superconductor/ semiconductor hybrid devices

T. Miyadera, Toshihiko Kiwa, I. Kawayama, H. Murakami, M. Tonouchi

Research output: Contribution to journalArticle

Abstract

We investigated the optical response of amorphous (a-) Ge thin films by a time-resolved reflectivity measurement and the observation of terahertz radiation from a-Ge photoconductive switch coupled with Au/Cr transmission lines. The results show that the lifetime of photocarrier in the a-Ge is about 0.9 ps, and the pulse width of terahertz beam radiated from the photoconductive switch is about 1 ps. These results indicate that a-Ge can be used as an optical-to-electrical converter in sub-terahertz frequency range. However, the peak width of a-Ge photoconductive switches with YBCO transmission lines is about 2 ps and broad compared with the result with Au/Cr transmission lines.

Original languageEnglish
Pages (from-to)1602-1606
Number of pages5
JournalPhysica C: Superconductivity and its Applications
Volume412-414
Issue numberSPEC. ISS.
DOIs
Publication statusPublished - Oct 2004
Externally publishedYes

Fingerprint

Photoconductive switches
Superconducting materials
transmission lines
Electric lines
switches
Semiconductor materials
Thin films
thin films
converters
pulse duration
frequency ranges
reflectance
Radiation
life (durability)
radiation

Keywords

  • Amorphous Ge
  • Optical-to-electrical signal converter
  • Terahertz radiation
  • YBCO

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Ultrafast optical study of amorphous Ge thin films for superconductor/ semiconductor hybrid devices. / Miyadera, T.; Kiwa, Toshihiko; Kawayama, I.; Murakami, H.; Tonouchi, M.

In: Physica C: Superconductivity and its Applications, Vol. 412-414, No. SPEC. ISS., 10.2004, p. 1602-1606.

Research output: Contribution to journalArticle

Miyadera, T. ; Kiwa, Toshihiko ; Kawayama, I. ; Murakami, H. ; Tonouchi, M. / Ultrafast optical study of amorphous Ge thin films for superconductor/ semiconductor hybrid devices. In: Physica C: Superconductivity and its Applications. 2004 ; Vol. 412-414, No. SPEC. ISS. pp. 1602-1606.
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