Investigation of bias current and modulation frequency dependences of detectivity of YBCO TES and the effects of coating of Cu-C composite absorber layer
Author(s)
Date
2009Source Title
IEEE Transactions on Applied Superconductivity
Print ISSN
10518223
Volume
19
Issue
4
Pages
3688 - 3693
Language
English
Type
ArticleItem Usage Stats
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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.
Keywords
DetectivityInfrared 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