TY  - ABST
AU  - Hübers, Heinz-Wilhelm
AU  - Semenov, A.
AU  - Richter, H.
AU  - Smirnov, K.
AU  - Gol'tsman, G.
AU  - Voronov, B.
A2  - Far-IR, Sub-mm & MM Detector Technology Workshop, 1-3 April 2002
PY  - 2002
DA  - 2002//
TI  - Phonon cooled far-infrared hot electron bolometer mixer
T2  - NASA/ADS
BT  - NASA/ADS
KW  - NbN HEB mixers
AB  - Heterodyne receivers for applications in astronomy need quantum-limited sensitivity. At frequencies above 1.4 THz superconducting hot electron bolometers (HEB) can be used to achieve this goal. We present results of the development of a quasi-optical phonon-cooled NbN HEB mixer for GREAT, the German heterodyne receiver for SOFIA. Different mixers with logarithmic spiral and double slot feed antennas have been investigated with respect to their noise temperature, conversion loss, linearity and beam pattern at several frequencies between 0.7 THz and 5.2 THz. At 2.5 THz a double sideband noise temperature of 2200 K was achieved. The conversion loss was 16 dB. The response of the mixer was linear up to 400 K load temperature. This performance was verified by measuring an emission line of methanol at 2.5 THz. The results demonstrate that the NbN HEB is very well suited as a mixer for FIR heterodyne receivers.
UR  - https://ui.adsabs.harvard.edu/abs/2002fism.workE..37H
N1  - id.37
ID  - Huebers_etal2002
ER  -