Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4855..383m&link_type=abstract
Millimeter and Submillimeter Detectors for Astronomy. Edited by Phillips, Thomas G.; Zmuidzinas, Jonas. Proceedings of the SPI
Astronomy and Astrophysics
Astronomy
Scientific paper
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.
Adam Aurele
Cherednichenko Sergey
Khosropanah Pourya
Kollberg Erik L.
Merkel Harald F.
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