Hübers, H.-W. and Semenov, A. and Richter, H. and Birk, Manfred and Krocka, Michail and Mair, Ulrich and Smirnov, K. and Gol'tsman, Gregory and Voronov, B. (2003) Superconducting hot electron bolometer as mixer for far-infrared heterodyne receivers. In: Millimeter and Submillimeter Detectors for Astronomy, 4855, pp. 395-401. SPIE. Millimeter and Submillimeter Detectors for Astronomy, Waikoloa, Hawaii/USA, 25.-28.8.2002. ISBN 0277-786X.
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Heterodyne receivers for applications in astronomy need quantum limited sensitivity. In instruments which are currently under development for SOFIA or Herschel superconducting hot electron bolometers (HEB) will be used to achieve this goal at frequencies above 1.4 THz. We present results of the development of a phonon-cooled NbN HEB mixer for GREAT, the German Receiver for Astronomy at Terahertz Frequencies, which will be flown aboard SOFIA. The mixer is a small superconducting bridge incorporated in a planar feed antenna and a hyperhemispherical lens. 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 2.5 THz a double sideband noise temperature of 2200 K was achieved. The conversion loss was 17 dB. The response of the mixer was linear up to 400 K load temperature. The performance was verified by measuring an emission line of methanol at 2.5 THz. The measured linewidth is in good agreement with the linewidth deduced from pressure broadening measurements at millimeter wavelength. The results demonstrate that the NbN HEB is very well suited as a mixer for far-infrared heterodyne receivers.
|Document Type:||Conference or Workshop Item (Paper)|
|Title:||Superconducting hot electron bolometer as mixer for far-infrared heterodyne receivers|
|Journal or Publication Title:||Millimeter and Submillimeter Detectors for Astronomy|
|Page Range:||pp. 395-401|
|Series Name:||Proceedings of SPIE|
|Keywords:||Supraleitung, Terahertz, SOFIA, Bolometer, Hot electron, Heterosynempfänger, Ferninfrarot, Mischer|
|Event Title:||Millimeter and Submillimeter Detectors for Astronomy, Waikoloa, Hawaii/USA, 25.-28.8.2002|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Space (old)|
|HGF - Program Themes:||W EW - Erforschung des Weltraums|
|DLR - Research area:||Space|
|DLR - Program:||W EW - Erforschung des Weltraums|
|DLR - Research theme (Project):||UNSPECIFIED|
|Institutes and Institutions:||Remote Sensing Technology Institute|
Institut für Weltraumsensorik und Planetenerkundung
|Deposited By:||Susanne Pieth|
|Deposited On:||17 Feb 2006|
|Last Modified:||14 Jan 2010 18:25|
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