Measurements of the optical performance of prototype TES bolometers for SAFARI

M. D. Audley, G. De Lange, M. Ranjan, J. R. Gao, P. Khosropanah, M. L. Ridder, Philip Mauskopf, D. Morozov, S. Doherty, N. Trappe, S. Withington

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We have measured the optical response of prototype 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 over the wavelength range 34-210 μm. Each horn-coupled bolometer consists of a transition edge sensor (TES), with a transition temperature close to 100 mK, and a thin-film Ta absorber on a thermally-isolated silicon nitride membrane. SAFARI requires extremely sensitive detectors (NEP∼2×10-19 W/√Hz), with correspondingly low saturation powers (∼5 fW), 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 based on a cryogen-free high-capacity dilution refrigerator, paying careful attention to stray-light exclusion, shielding, and vibration isolation. For optical measurements the system contains internal cold (3-30 K) and hot (∼300 K) black-body calibration sources, as well as a light pipe for external illumination. We discuss our measurements of high optical efficiency in prototype SAFARI detectors and describe recent improvements to the test facility that will enable us to test the full SAFARI focal-plane arrays.

Original languageEnglish (US)
Pages (from-to)755-760
Number of pages6
JournalJournal of Low Temperature Physics
Volume176
Issue number5-6
DOIs
StatePublished - 2014

Fingerprint

Bolometers
bolometers
prototypes
Detectors
sensors
detectors
Sensors
test facilities
Test facilities
Spectrometers
Stray light
Focal plane arrays
Refrigerators
infrared spectrometers
imaging spectrometers
refrigerators
Infrared imaging
focal plane devices
exclusion
Silicon nitride

Keywords

  • Infra-red bolometers
  • Low-temperature detectors
  • Optical testing
  • Transition edge sensors

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)

Cite this

Audley, M. D., De Lange, G., Ranjan, M., Gao, J. R., Khosropanah, P., Ridder, M. L., ... Withington, S. (2014). Measurements of the optical performance of prototype TES bolometers for SAFARI. Journal of Low Temperature Physics, 176(5-6), 755-760. https://doi.org/10.1007/s10909-013-0984-5

Measurements of the optical performance of prototype TES bolometers for SAFARI. / Audley, M. D.; De Lange, G.; Ranjan, M.; Gao, J. R.; Khosropanah, P.; Ridder, M. L.; Mauskopf, Philip; Morozov, D.; Doherty, S.; Trappe, N.; Withington, S.

In: Journal of Low Temperature Physics, Vol. 176, No. 5-6, 2014, p. 755-760.

Research output: Contribution to journalArticle

Audley, MD, De Lange, G, Ranjan, M, Gao, JR, Khosropanah, P, Ridder, ML, Mauskopf, P, Morozov, D, Doherty, S, Trappe, N & Withington, S 2014, 'Measurements of the optical performance of prototype TES bolometers for SAFARI', Journal of Low Temperature Physics, vol. 176, no. 5-6, pp. 755-760. https://doi.org/10.1007/s10909-013-0984-5
Audley, M. D. ; De Lange, G. ; Ranjan, M. ; Gao, J. R. ; Khosropanah, P. ; Ridder, M. L. ; Mauskopf, Philip ; Morozov, D. ; Doherty, S. ; Trappe, N. ; Withington, S. / Measurements of the optical performance of prototype TES bolometers for SAFARI. In: Journal of Low Temperature Physics. 2014 ; Vol. 176, No. 5-6. pp. 755-760.
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