Study on Sub-THz Signal Input for Superconducting Electronic Devices(<Special Section>Innovative Superconducting Devices and Their Applications)

Iwao Kawayama, Yasushi Doda, Ryuhei Kinjo, Toshihiko Kiwa, Hironaru Murakami, Masayoshi Tonouchi

Research output: Contribution to journalArticle

Abstract

Development of ultrafast optical interfaces that can operate in sub-terahertz region is important to apply superconducting electronic devices to the high-end systems. We have performed several fundamental researches to realize the ultrafast optical input interface for superconducting electronic devices. Firstly, we observed optical response of amorphous Ge thin films, and the results indicated that an amorphous Ge photoconductive switch could stably operate in a terahertz frequency range as an optical-to-electrical signal converter in the low-temperature region below T_c of YBCO. Next, we have fabricated optical-to-electrical signal conversion system with photomixing technique, and we have demonstrated the generation and the detection of high frequency signals over 50GHz. Finally, we have observed optical responses of a Josephson vortex flow transistor under irradiation of femtosecond laser pulses, and the results suggeste that the device has high potential as an optical interface.
Original languageEnglish
Pages (from-to)588-594
Number of pages7
JournalIEICE Transactions on Electronics
Volume90
Issue number3
Publication statusPublished - Mar 1 2007
Externally publishedYes

Keywords

  • ultrafast optical interface
  • amorphous Ge
  • photomixing
  • Josephson vortex flow transistor

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