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Current-noise superconducting bolometer for terahertz waves

Semenov, Alexey and Richter, Heiko and Hübers, Heinz-Wilhelm and Il´in, Konstantin and Siegel, Michael and Engel, Andreas (2005) Current-noise superconducting bolometer for terahertz waves. In: Proceedings of the 9th World Multi-Conference on Systemics, Cybernetics and Informatics, IX, pp. 176-177. WMSCI 2005, 2005-07-10 - 2005-07-13, Orlando, Florida (USA). ISBN 980-6560-61-2.

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Abstract

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<sup>-14</sup> W Hz<sup>-1</sup> and is likely to improve at lower temperatures.

Document Type:Conference or Workshop Item (Speech)
Title:Current-noise superconducting bolometer for terahertz waves
Authors:
AuthorsInstitution or Email of Authors
Semenov, AlexeyUNSPECIFIED
Richter, HeikoUNSPECIFIED
Hübers, Heinz-WilhelmUNSPECIFIED
Il´in, KonstantinUniversity of Karlsruhe, Institute of Micro- and Nanoelectronic Systems
Siegel, MichaelUniversity of Karlsruhe, Institute of Micro- and Nanoelectronic Systems
Engel, AndreasUniversity of Zürich, Physics Institute
Date:2005
Journal or Publication Title:Proceedings of the 9th World Multi-Conference on Systemics, Cybernetics and Informatics
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Volume:IX
Page Range:pp. 176-177
Editors:
EditorsEmail
Tremante, A. et al.UNSPECIFIED
ISBN:980-6560-61-2
Status:Published
Keywords:Noise in superconductors, nonequilibrium superconductivity, Superconducting terahertz and submillimeter wave detectors
Event Title:WMSCI 2005
Event Location:Orlando, Florida (USA)
Event Type:international Conference
Event Dates:2005-07-10 - 2005-07-13
Organizer:Institute of Informatics and Systemics
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:11 Dec 2005
Last Modified:27 Apr 2009 04:45

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