Ultrasensitive TES bolometers for space based FIR astronomy

Details Ultrasensitive TES bolometers for space based FIR astronomy Ultrasensitive TES bolometers for space based FIR astronomy

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1185...48m&link_type=abstract

THE THIRTEENTH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE DETECTORS-LTD13. AIP Conference Proceedings, Volume 1185, pp. 48-51 (2

Physics

3

Infrared Detectors, Superconducting Cables, Bolometers, Bolometers, Infrared, Submillimeter Wave, Microwave, And Radiowave Receivers And Detectors, Superconducting Optical, X-Ray, And Gamma-Ray Detectors, Photoconductors And Bolometers

Scientific paper

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].

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