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Proceedings Paper

Heterodyne receiver for 3-5 THz with hot-electron bolometer mixer
Author(s): Heinz-Wilhelm Hubers; Alexei Semenov; Heiko Richter; Martin Schwarz; Burghardt Gunther; Konstantin Smirnov; Gregory Gol'tsman; Boris Voronov
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Paper Abstract

Heterodyne receivers for applications in astronomy and planetary research need quantum limited sensitivity. In instruments which are currently build for SOFIA and Herschel superconducting hot electron bolometers (HEB) will be used to achieve this goal at frequencies above 1.4 THz. The local oscillator and the mixer are the most critical components for a heterodyne receiver operating at 3-5 THz. The design and performance of an optically pumped THz gas laser optimized for this frequency band will be presented. In order to optimize the performance for this frequency hot electron bolometer mixers with different in-plane dimensions and logarithmic-spiral feed antennas have been investigated. Their noise temperatures and beam patterns were measured. Above 3 THz the best performance was achieved with a superconducting bridge of 2.0 x 0.2 μm2 incorporated in a logarithmic spiral antenna. The DSB noise temperatures were 2700 K, 4700 K and 6400 K at 3.1 THz, 4.3 THz and 5.2 THz, respectively. The results demonstrate that the NbN HEB is very well suited as a mixer for THz heterodyne receivers up to at least 5 THz.

Paper Details

Date Published: 8 October 2004
PDF: 8 pages
Proc. SPIE 5498, Millimeter and Submillimeter Detectors for Astronomy II, (8 October 2004); doi: 10.1117/12.552974
Show Author Affiliations
Heinz-Wilhelm Hubers, Moscow State Pedagogical Univ. (Germany)
Alexei Semenov, Moscow State Pedagogical Univ. (Germany)
Heiko Richter, Moscow State Pedagogical Univ. (Germany)
Martin Schwarz, Moscow State Pedagogical Univ. (Germany)
Burghardt Gunther, Moscow State Pedagogical Univ. (Germany)
Konstantin Smirnov, Moscow State Pedagogical Univ. (Russia)
Gregory Gol'tsman, Moscow State Pedagogical Univ. (Russia)
Boris Voronov, Moscow State Pedagogical Univ. (Russia)

Published in SPIE Proceedings Vol. 5498:
Millimeter and Submillimeter Detectors for Astronomy II
Jonas Zmuidzinas; Wayne S. Holland; Stafford Withington, Editor(s)

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