Investigation of bias current and modulation frequency dependences of detectivity of YBCO TES and the effects of coating of Cu-C composite absorber layer

Date
2009
Authors
Moftakharzadeh, A.
Kokabi, A.
Bozbey, A.
Ghodselahi, T.
Vesaghi, M.A.
Khorasani, S.
Banzet, M.
Schubert J.
Fardmanesh, M.
Advisor
Supervisor
Co-Advisor
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Instructor
Source Title
IEEE Transactions on Applied Superconductivity
Print ISSN
10518223
Electronic ISSN
Publisher
Volume
19
Issue
4
Pages
3688 - 3693
Language
English
Type
Article
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Volume Title
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Abstract

Bolometric response and noise characteristics of YBCO superconductor transition edge IR detectors with relatively sharp transition and its resulting detectivity are investigated both theoretically and experimentally. The magnitude of response of a fabricated device was obtained for different bias currents and modulation frequencies. Using the measured and calculated bolometric response and noise characteristics, we found and analyzed the device detectivity versus frequency for different bias currents. The detectivity versus chopping frequency of the device did not decrease following the response strongly, due to the decrease of the noise at higher frequencies up to 1 kHz, resulting in maximum detectivity around the modulation frequency of 100 Hz. We also improved the responsivity of the device through the increase of the surface absorption by using a novel infrared absorber, which is made of a copper-carbon composite, coated in a low-temperature process. Within the modulation frequency range studied in this paper, comparison of device detectivity before and after coating is also presented. © 2009 IEEE.

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Keywords
Detectivity, Infrared absorber, Transition edge sensor (TES), Absorber layers, Before and after, Bolometric response, Carbon composites, Chopping frequency, Detectivity, Fabricated device, Higher frequencies, Infrared absorber, IR detector, Low-temperature process, Modulation frequencies, Noise characteristic, Responsivity, Sharp transition, Surface absorption, Transition edge sensor (TES), YBCO superconductor, Carbon carbon composites, Infrared absorption, Nanosensors, Yttrium barium copper oxides, Modulation
Citation
Published Version (Please cite this version)