title: Compact terahertz passive spectrometer with wideband superconductor-insulator-superconductor mixer.
abstract: We developed a compact terahertz (THz) spectrometer with a superconductor-insulator-superconductor (SIS) mixer, aiming to realize a portable and highly sensitive spectrometer to detect dangerous gases at disaster sites. The receiver cryostat which incorporates the SIS mixer and a small cryocooler except for a helium compressor has a weight of 27 kg and dimensions of 200 mm × 270 mm × 690 mm. In spite of the small cooling capacity of the cryocooler, the SIS mixer is successfully cooled lower than 4 K, and the temperature variation is suppressed for the sensitive measurement. By adopting a frequency sweeping system using photonic local oscillator, we demonstrated a spectroscopic measurement of CH(3)CN gas in 0.2-0.5 THz range.
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Ibaraki 305-8568, Japan. kikuchi.kenichi@nict.go.jp
authors.forename: K
authors.initials: K
authors.lastname: Kikuchi
authors.forename: S
authors.initials: S
authors.lastname: Kohjiro
authors.forename: T
authors.initials: T
authors.lastname: Yamada
authors.forename: N
authors.initials: N
authors.lastname: Shimizu
authors.forename: A
authors.initials: A
authors.lastname: Wakatsuki