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Proceedings Paper

Bolometric receivers for terahertz applications
Author(s): Harald F. Merkel; Sergey Cherednichenko; Pourya Khosropanah; Aurele Adam; Therese Ottoson; Erik L. Kollberg
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Paper Abstract

Bolometric receivers serve as direct detectors, photon counters and as heterodyne receivers in astronomical instruments. Heterodyne hot-electron bolometric mixers show record sensitivity for observation frequencies above a Terahertz. In this paper NbN phonon-cooled mixers, conversion gain, noise and stability are discussed based on device models including Andreev reflection and critical current effects. The geometry (4 μm wide, 0.4 μm long on a 35 Å thick film), critical current (as high as possible) and critical temperature (about 8.5K) of an optimum phonon-cooled bolometric receiver operated at 2 to 4 K is discussed. Smaller devices than the optimum show worse noise performance. Larger devices require too high local oscillator power.

Paper Details

Date Published: 17 February 2003
PDF: 12 pages
Proc. SPIE 4855, Millimeter and Submillimeter Detectors for Astronomy, (17 February 2003); doi: 10.1117/12.459709
Show Author Affiliations
Harald F. Merkel, Chalmers Univ. of Technology (United States)
Sergey Cherednichenko, Chalmers Univ. of Technology (United States)
Pourya Khosropanah, Chalmers Univ. of Technology (Sweden)
Aurele Adam, Chalmers Univ. of Technology (Sweden)
Therese Ottoson, Chalmers Univ. of Technology (Sweden)
Erik L. Kollberg, Chalmers Univ. of Technology (Sweden)

Published in SPIE Proceedings Vol. 4855:
Millimeter and Submillimeter Detectors for Astronomy
Thomas G. Phillips; Jonas Zmuidzinas, Editor(s)

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