PT Unknown
AU Yagoubov, P
   Kroug, M
   Merkel, H
   Kollberg, E
   Hübers, H
   Schubert, J
   Schwaab, G
   Gol'tsman, G
   Gershenzon, E
TI NbN hot electron bolometric mixers at frequencies between 0.7 and 3.1 THz
SE Proc. 10[super:th] Int. Symp. Space Terahertz Technol.
PY 1999
BP 238
EP 246
DE NbN HEB mixers
AB The performance of NbN based phonon-cooled Hot Electron Bolometric (HEB) quasioptical mixers is investigated in the 0.7-3.1 THz frequency range. The devices are made from a 3.5-4 nm thick NbN film on high resistivity Si and integrated with a planar spiral antenna on the same substrate. The length of the bolometer microbridge is 0.1- 0.2 gm, the width is 1-2 gm. The best results of the DSB receiver noise temperature measured at 1.5 GHz intermediate frequency are: 800 K at 0.7 THz, 1100 K at 1.6 THz, 2000 K at 2.5 THz and 4200 K at 3.1 THz. The measurements were performed with a far infrared laser as the local oscillator (LO) source. The estimated LO power required is less than 500 nW at the receiver input. First results on the spiral antenna polarization measurements are reported.
ER