PT Journal
AU Kroug, M
   Cherednichenko, S
   Merkel, H
   Kollberg, E
   Voronov, B
   Gol'tsman, G
   Hübers, HW
   Richter, H
TI NbN hot electron bolometric mixers for terahertz receivers
SO IEEE Trans. Appl. Supercond.
JI IEEE Trans. Appl. Supercond.
PY 2001
BP 962
EP 965
VL 11
IS 1
DI 10.1109/77.919508
DE NbN HEB mixers
AB Sensitivity and gain bandwidth measurements of phonon-cooled NbN superconducting hot-electron bolometer mixers are presented. The best receiver noise temperatures are: 700 K at 1.6 THz and 1100 K at 2.5 THz. Parylene as an antireflection coating on silicon has been investigated and used in the optics of the receiver. The dependence of the mixer gain bandwidth (GBW) on the bias voltage has been measured. Starting from low bias voltages, close to operating conditions yielding the lowest noise temperature, the GBW increases towards higher bias voltages, up to three times the initial value. The highest measured GBW is 9 GHz within the same bias range the noise temperature increases by a factor of two.
ER