1NASA Goddard Space Flight Ctr. (United States) 2Global Science and Technology (United States) 3MEI Technologies, Inc. (United States) 4Catholic Univ. of America (United States)
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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); https://doi.org/10.1117/12.856450