Low-noise 1.5 THz waveguide-type hot-electron bolometer mixers using relatively thick NbTiN superconducting film

Tatsuya Shiino, Ryuta Furuya, Tatsuya Soma, Yoshimasa Watanabe, Takeshi Sakai, Ling Jiang, Hiroyuki Maezawa, Tetsuya Yamakura, Nami Sakai, Satoshi Yamamoto

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We have developed waveguide-type low-noise superconducting hot-electron bolometer (HEB) mixers for astronomical observations in the 1.3-1.5 THz region by using a relatively thick NbTiN superconducting film (10.8 nm). We have achieved a receiver noise temperature of 490K (DSB: double side band) at 1.475 THz. This noise temperature corresponds to seven times the quantum noise. According to gain bandwidth measurements, the contribution of diffusion cooling is found to be responsible for such a good noise performance.

Original languageEnglish
Article number033101
JournalJapanese Journal of Applied Physics
Volume54
Issue number3
DOIs
Publication statusPublished - 2015 Mar 1
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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