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Proceedings Paper

NbN hot-electron bolometer as THz mixer for SOFIA
Author(s): Heinz-Wilhelm Huebers; A. Semenov; Josef Schubert; Gregory N. Gol'tsman; Boris M. Voronov; Eugeni M. Gershenzon; Alfred Krabbe; Hans-Peter Roeser
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Paper Abstract

Heterodyne receivers for applications in astronomy need quantum limited sensitivity. We have investigated phonon- cooled NbN hot electron bolometric mixers in the frequency range from 0.7 THz to 5.2 THz. The devices were 3.5 nm thin films with an in-plane dimension of 1.7 X 0.2 micrometers 2 integrated in a complementary logarithmic spiral antenna. The best measured DSB receiver noise temperatures are 1300 K (0.7 THz), 2000 K (1.4 THz), 2100 K (1.6 THz), 2600 K (2.5 THz), 4000 K (3.1 THz), 5600 K (4.3 THz), and 8800 K (5.2 THz). The sensitivity fluctuation, the long term stability, and the antenna pattern were measured. The results demonstrate that this mixer is very well suited for GREAT, the German heterodyne receiver for SOFIA.

Paper Details

Date Published: 20 June 2000
PDF: 8 pages
Proc. SPIE 4014, Airborne Telescope Systems, (20 June 2000); doi: 10.1117/12.389097
Show Author Affiliations
Heinz-Wilhelm Huebers, DLR (Germany)
A. Semenov, Moscow State Pedagogical Univ. (Russia)
Josef Schubert, DLR (Germany)
Gregory N. Gol'tsman, Moscow State Pedagogical Univ. (Russia)
Boris M. Voronov, Moscow State Pedagogical Univ. (Russia)
Eugeni M. Gershenzon, Moscow State Pedagogical Univ. (Russia)
Alfred Krabbe, DLR (United States)
Hans-Peter Roeser, DLR (Germany)

Published in SPIE Proceedings Vol. 4014:
Airborne Telescope Systems
Ramsey K. Melugin; Hans-Peter Roeser, Editor(s)

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