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

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      Author(s)
      Moftakharzadeh, A.
      Kokabi, A.
      Bozbey, A.
      Ghodselahi, T.
      Vesaghi, M.A.
      Khorasani, S.
      Banzet, M.
      Schubert J.
      Fardmanesh, M.
      Date
      2009
      Source Title
      IEEE Transactions on Applied Superconductivity
      Print ISSN
      10518223
      Volume
      19
      Issue
      4
      Pages
      3688 - 3693
      Language
      English
      Type
      Article
      Item Usage Stats
      151
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      287
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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
      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
      Permalink
      http://hdl.handle.net/11693/22670
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/TASC.2009.2020866
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      • Department of Electrical and Electronics Engineering 3868
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