Sensitivity Measurements of a Transition-Edge Hot-Electron Microbolometer for Millimeter-Wave Astrophysical Observations |
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| Authors: | E M Barrentine P T Timbie T R Stevenson S Ali J A Chervenak E Wollack S H Moseley C A Allen W T Hseih T M Miller D J Benford A D Brown |
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| Affiliation: | (1) University of Wisconsin-Madison, Madison, WI 53706, USA;(2) NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA;(3) Lawrence Livermore National Laboratory, Livermore, CA 94550, USA |
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| Abstract: | Future experiments to probe the Cosmic Microwave Background (CMB) polarization will need arrays of 1000s of sensitive bolometers.
We are developing a Transition-edge Hot-electron Microbolometer (THM) to fill this need. This small-volume bolometer consists
of a superconducting bilayer Transition-Edge Sensor (TES) with a thin-film absorber. Unlike traditional monolithic bolometers
which make use of micromachined structures, the THM employs the decoupling between electrons and phonons at milliKelvin temperatures
to provide thermal isolation. The devices are fabricated photolithographically and are easily integrated with antennas via
microstrip transmission lines, and with SQUID readouts. We present the results of noise, responsivity, and thermal conductance
measurements in which electrical power is dissipated in the absorber, and confirm a thermal model for a test THM with a Mo/Au
TES and Bi/Au absorber.
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| Keywords: | Microbolometers Transition-edge sensors Cosmic microwave background Millimeter waves Hot-electron effect Transition-edge hot-electron microbolometer |
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