15 July 2010 Development of superconducting transition edge sensors based on electron-phonon decoupling
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Abstract
We have successfully fabricated a superconducting transition edge sensor (TES), bolometer that centers on the use of electron-phonon decoupling (EPD) for thermal isolation. We have selected a design approach that separates the two functions of far-infrared and THz radiative power absorption and temperature measurement, allowing separate optimization of the performance of each element. We have integrated molybdenum/gold (Mo/Au) bilayer TES and ion assisted thermally evaporated (IAE) bismuth (Bi) films as radiation absorber coupled to a low-loss microstripline from niobium (Nb) ground plane to a twin-slot antenna structure. The thermal conductance (G) and the time constant for the different geometry device have been measured. For one such device, the measured G is 1.16×10-10 W/K (± 0.61×10- 10 W/K) at 60 mK, which corresponds to noise equivalent power (NEP) = 1.65×10-18W/ √Hz and time constant of ~5 μs.
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Nikhil Jethava, James Chervenak, Ari-David Brown, Dominic Benford, Gunther Kletetschka, Vilem Mikula, Kongpop U-yen, "Development of superconducting transition edge sensors based on electron-phonon decoupling", Proc. SPIE 7741, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy V, 774120 (15 July 2010); doi: 10.1117/12.856450; https://doi.org/10.1117/12.856450
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