PT Unknown
AU Gousev, YP
   Olsson, HK
   Gol'tsman, GN
   Voronov, BM
   Gershenzon, EM
TI NbN hot-electron mixer at radiation frequencies between 0.9 THz and 1.2 THz
SE Proc. 9[super:th] Int. Symp. Space Terahertz Technol.
PY 1998
BP 121
EP 129
DE NbN HEB mixers
AB We report on noise temperature measurements for a NbN phonon-cooled hot-electron mixer at radiation frequencies between 0.9 THz and 1.2 THz. Radiation was coupled to the mixer, placed in a vacuum chamber of He cryostat, by means of a planar spiral antenna and a Si immersion lens. A backward-wave oscillator, tunable throughout the spectral range, delivered an output power of few 1.1W that was enough for optimum operation of the mixer. At 4.2 K ambient temperature and 1.025 THz radiation frequency, we obtained a receiver noise temperature of 1550 K despite of using a relatively noisy room-temperature amplifier at the intermediate frequency port. The noise temperature was fairly constant throughout the entire operation range and for intermediate frequencies from 1 GHz to 2 GHz.
ER