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Design and Fabrication of a Free-membrane Type High-Tc Superconducting Wide Band Detector for THz Detection

Mohajeri, Roya | 2017

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 50299 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Fardmanesh, Mehdi
  7. Abstract:
  8. A free-membrane superconducting transition edge detector was designed and fabricared for IR and THz detection. YBCO superconducting thin films was grown on SrTiO3 (STO) and Yttria Stabilized Zirconia (YSZ) crystalline substrates using RF magnetron sputtering technique and Metal Organic Deposition method. The electrical and optical characterization of the fabricated transition-edge detectors was carried out in a liquid nitrogen based cooling system. The voltage response of the detector was studied in relation to the thermal parameters and the biasing parameters of the device for optimal design of the transition edge detector. Analytical simulations conducted by applying a one-dimensional thermosphysical model were also perfomed for further accurate response analysis of the samples, of which the results was in good agreement with the experimental results. In order to improve the detectivity of the fabricated detector, absorber layers were implemented on the backside of the device. A metamaterial based absorber was designed and simulated for THz range of frequencies with spectral bandwidth as high as 1.5 THz. A detectivity above 1010 cmHz0.5/W could be achieved for the fabricated free-membrane superconducting detector. Finally, the thermal images of some objects as well as human body were captured using the fabricated superconducting detector
  9. Keywords:
  10. Infrared Detector ; High Temperature Superconductor ; Terahertz Band ; Transition Detector ; Free Membrance Detector ; Wide Band Detection

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