Records |
Author |
Semenov, A.; Hübers, H.-W.; Engel, A.; Gol’tsman, G. |
Title |
Superconducting quantum detector for far infrared astronomy |
Type |
Conference Article |
Year |
2002 |
Publication |
Far-IR, Sub-mm & MM Detector Technology Workshop |
Abbreviated Journal |
Far-IR, Sub-mm & MM Detector Technology Workshop |
Volume |
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Issue |
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Pages |
3-49 |
Keywords |
SQD |
Abstract |
We present the concept of the superconducting quantum detector for astronomy. Response to a single absorbed photon appears due to successive formation of a normal spot and phase-slip-centres in a narrow strip carrying sub-critical supercurrent. The detector simultaneously has a moderate energy resolution and a variable cut-off wavelength depending on both the material used and operation conditions. We simulated performance of the background-limited direct detector having the 100-micrometer cut-off wavelength. Low dark count rate will allow to realise 10-21 W Hz-1/2 noise equivalent power at 4 K background radiation. The detection mechanism provides a moderate 1/20 energy resolution at 50-micrometer wavelength. |
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Corporate Author |
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Thesis |
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Publisher |
NASA |
Place of Publication |
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Editor |
Wolf, J.; Farhoomand, J.; McCreight, C.R. |
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Summary Language |
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Original Title |
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Series Editor |
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Series Title |
NASA CP |
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Series Volume |
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Edition |
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ISSN |
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Conference |
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Notes |
Volume: 211408 |
Approved |
no |
Call Number |
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Serial |
1538 |
Permanent link to this record |
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Author |
Huebers, H.-W.; Semenov, A.; Richter, H.; Birk, M.; Krocka, M.; Mair, U.; Smirnov, K.; Gol’tsman, G. N.; Voronov, B. M. |
Title |
Superconducting hot electron bolometer as mixer for far-infrared heterodyne receivers |
Type |
Conference Article |
Year |
2003 |
Publication |
Proc. SPIE |
Abbreviated Journal |
Proc. SPIE |
Volume |
4855 |
Issue |
|
Pages |
395-401 |
Keywords |
NbN HEB mixers |
Abstract |
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. |
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Corporate Author |
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Thesis |
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Publisher |
SPIE |
Place of Publication |
Tucson, USA |
Editor |
Phillips, T. G.; Zmuidzinas, J. |
Language |
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Summary Language |
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Original Title |
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Series Editor |
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Series Title |
Presented at the Society of Photo-Optical Instrumentation Engineers (SPIE) Conference |
Abbreviated Series Title |
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Series Volume |
4855 |
Series Issue |
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Edition |
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ISSN |
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ISBN |
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Medium |
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Area |
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Expedition |
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Conference |
Millimeter and Submillimeter Detectors for Astronomy |
Notes |
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Approved |
no |
Call Number |
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Serial |
335 |
Permanent link to this record |