Optical measurements of TES bolometers for SAFARI

Michael D. Audley, Axel Detrain, Lorenza Ferrari, Jian Rong Gao, Darren Hayton, Gert De Lange, Philip Mauskopf, Dmitry Morozov, Manisha Ranjan Neil A Trappe, Willem Jan Vreeling

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


We have measured the optical response of detectors for SAFARI, the far-infrared imaging spectrometer for the SPICA satellite. SAFARI's three bolometer arrays, coupled with a Fourier transform spectrometer, will provide images of a 2′×2′ field of view with spectral information in three bands covering the wavelength range 34 - 210 μm. Each bolometer consists of a transition edge sensor (TES) with a transition temperature close to 100 mK and a resistive absorber on a thermally-isolated silicon nitride membrane. Each detector sits behind a concentrating horn and in front of a hemispherical backshort. SAFARI requires extremely sensitive detectors (NEP∼2×1019 W/√Hz) to take advantage of SPICA's cooled optics. To meet the challenge of testing such sensitive detectors we have constructed an ultra-low background test facility with a cryogen-free high-capacity dilution refrigerator, paying careful attention to stray-light exclusion. The SAFARI Detector System Test Facility provides a high degree of electrical, magnetic, and mechanical isolation for the detectors, allowing us to use a pulse-tube cooler to pre-cool the dilution refrigerator. We have verified the test facility's performance in terms of background power loading and carried out cross-calibrations with other test systems. The SAFARI Detector Test Facility is now being used for routine dark and optical measurements of ultra-sensitive TES bolometers. We report on optical measurements of prototype SAFARI detectors.

Original languageEnglish (US)
Title of host publication23rd International Symposium on Space Terahertz Technology 2012, ISSTT 2012
Number of pages9
StatePublished - Dec 1 2012
Event23rd International Symposium on Space Terahertz Technology 2012, ISSTT 2012 - Tokyo, Japan
Duration: Apr 2 2012Apr 4 2012

Publication series

Name23rd International Symposium on Space Terahertz Technology 2012, ISSTT 2012


Other23rd International Symposium on Space Terahertz Technology 2012, ISSTT 2012


  • Bolometers
  • Calibration
  • Immunity testing
  • Infrared detectors
  • Superconducting devices

ASJC Scopus subject areas

  • Computer Networks and Communications


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