Open AccessDevelopment of superconducting transition edge sensors based on electron-phonon decoupling
Author(s) -
N. Jethava,
J. A. Chervenak,
Ari-David Brown,
Dominic J. Benford,
G. Kletetschka,
Vilem Mikula,
Kongpop U-yen
Publication year - 2010
Publication title -
proceedings of spie, the international society for optical engineering/proceedings of spie
Language(s) - English
Resource type - Conference proceedings
SCImago Journal Rank - 0.192
H-Index - 176
eISSN - 1996-756X
pISSN - 0277-786X
DOI - 10.1117/12.856450
Subject(s) - transition edge sensor , bolometer , noise equivalent power , superconductivity , niobium , materials science , phonon , terahertz radiation , bismuth , physics , optoelectronics , atomic physics , analytical chemistry (journal) , condensed matter physics , optics , chemistry , responsivity , detector , metallurgy , photodetector , chromatography
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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