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Superconducting noise bolometer with microwave bias and readout for array applications

Kuzmin, A. A. and Semenov, A. D. and Schitov, S. V. and Merker, M and Wuensch, S. H. and Ustinov, A. V. and Siegel, Michael (2017) Superconducting noise bolometer with microwave bias and readout for array applications. Applied Physics Letters. American Institute of Physics (AIP). doi: 10.1063/1.4995981. ISSN 0003-6951.

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We present a superconducting noise bolometer for terahertz radiation, which is suitable for large-format arrays. It is based on an antenna-coupled superconducting micro-bridge embedded in a high-quality factor superconducting resonator for a microwave bias and readout with frequencydivision multiplexing in the GHz range. The micro-bridge is kept below its critical temperature and biased with a microwave current of slightly lower amplitude than the critical current of the microbridge. The response of the detector is the rate of superconducting fluctuations, which depends exponentially on the concentration of quasiparticles in the micro-bridge. Excess quasiparticles are generated by an incident THz signal. Since the quasiparticle lifetime increases exponentially at lower operation temperature, the noise equivalent power rapidly decreases. This approach allows for large arrays of noise bolometers operating above 1K with sensitivity, limited by 300-K background noise. Moreover, the response of the bolometer always dominates the noise of the readout due to relatively large amplitude of the bias current. We performed a feasibility study on a proofof- concept device with a 1.0�0.5 lm2 micro-bridge from a 9-nm thin Nb film on a sapphire substrate. Having a critical temperature of 5.8 K, it operates at 4.2K and is biased at the frequency 5.6 GHz. For the quasioptical input at 0.65 THz, we measured the noise equivalent power �3�10�12W/Hz1/2, which is close to expectations for this particular device in the noise-response regime.

Item URL in elib:https://elib.dlr.de/113879/
Document Type:Article
Title:Superconducting noise bolometer with microwave bias and readout for array applications
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Merker, MInstitute of Micro and Nanoelectronic systemsUNSPECIFIEDUNSPECIFIED
Wuensch, S. H.Institute of Micro and Nanoelectronic systemsUNSPECIFIEDUNSPECIFIED
Ustinov, A. V.University of KarlsruheUNSPECIFIEDUNSPECIFIED
Siegel, Michaelinstitut für mikro- und nanoelektronische systeme, universität karlsruheUNSPECIFIEDUNSPECIFIED
Date:24 July 2017
Journal or Publication Title:Applied Physics Letters
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:American Institute of Physics (AIP)
Keywords:dark Counts, noise Bolometer, microwave readout, arrays
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):Vorhaben Quantensensorik (old), R - Systems Engineering Optische Systeme (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Semenov, Prof.Dr. Alexey
Deposited On:05 Sep 2017 14:35
Last Modified:19 Jun 2023 10:26

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