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Noise Bolometer for Terahertz Waves

Semenov, Alexey and Richter, Heiko and Hübers, Heinz-Wilhelm and Il'in, Konstantin and Siegel, Michael (2006) Noise Bolometer for Terahertz Waves. In: Conference Proceedings 16th International Symposium on Space Terahertz Technology, pp. 505-506. Chalmers University of Technology, Göteborg, Sweden. 16th International Symposium on Space Terahertz Technology, 2005-05-02 - 2005-05-04, Göteborg (Sweden). ISSN 1652-0769

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An advantage of superconducting detectors is a much lower noise in comparison to their semiconductor counterparts. We have studied the magnitude and spectrum of electric noise in thin superconducting NbN nanostrips carrying a subcritical current. Analysis of the experimental data suggests that the noise appears due to fluctuations in the two-dimensional vortex gas below the Kosterlitz-Thouless phase transition. Implementing this approach to the noise mechanism, we proposed a novel detector. The novelty is the use of the noise, which generally hampers the performance of conventional detectors, as the physical quantity that itself senses radiation. Our detector patterned from a thin NbN superconducting film and integrated in a planar log-periodic antenna. The detector operates at 4.2 K in the current-carrying superconducting state. Optically measured noise-equivalent power amounted at 10^-13 W / Hz^1/2 and is likely to improve at lower temperatures.

Document Type:Conference or Workshop Item (Speech)
Title:Noise Bolometer for Terahertz Waves
AuthorsInstitution or Email of Authors
Semenov, AlexeyUNSPECIFIED
Hübers, Heinz-WilhelmUNSPECIFIED
Il'in, KonstantinUniversity of Karlsruhe
Siegel, MichaelUniversity of Karlsruhe
Date:1 June 2006
Journal or Publication Title:Conference Proceedings 16th International Symposium on Space Terahertz Technology
Refereed publication:Yes
In ISI Web of Science:No
Page Range:pp. 505-506
Ingvarson, MattiasUNSPECIFIED
Publisher:Chalmers University of Technology, Göteborg, Sweden
Keywords:Noise in superconductors, nonequilibrium superconductivity, Superconducting terahertz and submillimeter wave detectors
Event Title:16th International Symposium on Space Terahertz Technology
Event Location:Göteborg (Sweden)
Event Type:international Conference
Event Dates:2005-05-02 - 2005-05-04
Organizer:Chalmers University of Technology
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):W - Projekt SOFIA (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Terahertz and Infrared Sensors
Deposited By: Prof.Dr. Alexey Semenov
Deposited On:26 Jun 2006
Last Modified:27 Apr 2009 12:56

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