PT Unknown
AU Kawamura, J
   Blundell, R
   Tong, CE
   Golts'man, G
   Gershenzon, E
   Voronov B.
TI Superconductive NbN hot-electron bolometric mixer performance at 250 GHz
SE Proc. 7[super:th] Int. Symp. Space Terahertz Technol.
PY 1996
BP 331
EP 336
DE NbN HEB mixers
AB Thin film NbN (<40 A) strips are used as waveguide mixer elements. The electron cooling mechanism for the geometry is the electron-phonon interaction. We report a receiver noise temperature of 750 K at 244 GHz, with / IF = 1.5 GHz, Af= 500 MHz, and Tphysical = 4 K. The instantaneous bandwidth for this mixer is 1.6 GHz. The local oscillator (LO) power is 0.5 1.tW with 3 dB-uncertainty. The mixer is linear to 1 dB up to an input power level 6 dB below the LO power. We report the first detection of a molecular line emission using this class of mixer, and that the receiver noise temperature determined from Y-factor measurements reflects the true heterodyne sensitivity.
ER