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Ultrasensitive TES bolometers for space based FIR astronomy

Morozov, Dmitry L., Mauskopf, Philip Daniel, Ade, Peter A. R., Bruijn, M., de Korte, P. A. J., Hoevers, H., Ridder, M., Khosropanah, P., Dirks, B. and Gao, J.-R. 2010. Ultrasensitive TES bolometers for space based FIR astronomy. Presented at: 13th International Workshop on Low Temperature Detectors, Stanford, CA, USA, 20-24 July 2009. Published in: Young, Betty, Cabrera, Blas and Miller, Aaron eds. Proceedings of the 13th International Workshop on Low Temperature Detectors—LTD13, Stanford, California, 20-24 July 2009. AIP Conference Proceedings , vol. 1185. Melville, NY: American Institute of Physics, pp. 48-51. 10.1063/1.3292385

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Abstract

We present results from the development of a background limited transition edge sensor (TES) bolometer for the wavelength band 30–60 μm. The bolometer consists of a Ti∕Au superconducting thermometer and a Ta radiation absorber deposited on a 200μm×300μm membrane of SixNy suspended on long, narrow legs. This device is voltage biased and the current through the device is measured by a SQUID amplifier. The thermometer has transition temperature Tc  =  108 mK and the device is operated from a 70 mK base plate. FIR radiation is coupled into a multimodc horn with entrance aperture of 450 μm, length 4.5 mm and exit aperture of 45 μm, which feeds a metal integrating cavity containing the detector. The radiation band is defined by a pair of lowpass and highpass mesh filters in front of the horn. Here we present measurements of optical noise equivalent power (NEP), optical efficiency, dynamic range and time constant. The results show that measured TES detectors are close to meeting the requirement of the “Band 3” of SAFARI FTS imaging instrument [1] on the SPICA mission [2].

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: infrared detectors, superconducting cables, bolometers
Publisher: American Institute of Physics
ISBN: 9780735407510
ISSN: 0094243X
Last Modified: 07 Mar 2019 22:17
URI: http://orca.cf.ac.uk/id/eprint/25571

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