Graphene-channel FETs for photonic frequency double-mixing conversion over the sub-THz band

Tetsuya Kawasaki, Kenta Sugawara, Adrian Dobroiu, Takanori Eto, Yuki Kurita, Kazuki Kojima, Yuhei Yabe, Hiroki Sugiyama, Takayuki Watanabe, Tetsuya Suemitsu, Victor Ryzhii, Katsumi Iwatsuki, Youichi Fukada, Jun Ichi Kani, Jun Terada, Naoto Yoshimoto, Kenji Kawahara, Hiroki Ago, Taiichi Otsuji

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


We report on photonic frequency double-mixing conversion utilizing a graphene-channel FET (G-FET). Optoelectronic properties of graphene are exploited to perform single-chip photonic double-mixing functionality, which is greatly advantageous in future broadband technological conversion between optical fiber and sub-terahertz wireless communications. A 1 GHz modulation signal on a 125 GHz carrier is electrically input to the gate, whereas a 1.58 μm dual wavelength CW laser beam having a frequency difference of 112.5 GHz impinges on the G-FET. The G-FET works as a photomixer generating a 112.5 GHz local signal which is then electrically mixed to the 1 GHz modulated 125 GHz carrier signal, resulting in the down-conversion of the 1 GHz signal to a 12.5 GHz intermediate frequency (IF) signal.

Original languageEnglish
Pages (from-to)216-221
Number of pages6
JournalSolid-State Electronics
Publication statusPublished - 2015 Jan


  • FET
  • Graphene
  • Photomixing
  • Photoresponse
  • Terahertz


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