Article

Journal of Low Temperature Physics

, Volume 167, Issue 3, pp 188-194

Open Access This content is freely available online to anyone, anywhere at any time.

Distributed TES Model for Designing Low Noise Bolometers Approaching SAFARI Instrument Requirements

  • P. KhosropanahAffiliated withSRON Netherlands Institute for Space Research Email author 
  • , R. A. HijmeringAffiliated withSRON Netherlands Institute for Space Research
  • , M. RidderAffiliated withSRON Netherlands Institute for Space Research
  • , M. A. LindemanAffiliated withSRON Netherlands Institute for Space Research
  • , L. GottardiAffiliated withSRON Netherlands Institute for Space Research
  • , M. BruijnAffiliated withSRON Netherlands Institute for Space Research
  • , J. van der KuurAffiliated withSRON Netherlands Institute for Space Research
  • , P. A. J. de KorteAffiliated withSRON Netherlands Institute for Space Research
  • , J. R. GaoAffiliated withSRON Netherlands Institute for Space ResearchKavli Institute of NanoScience, Delft University of Technology
    • , H. HoeversAffiliated withSRON Netherlands Institute for Space Research

Abstract

Transition edge sensors (TES) are the chosen detector technology for the SAFARI imaging spectrometer on the SPICA telescope. The TES are required to have an NEP of \(2\mbox{--}3\times 10^{-19}~\mbox{W/}\sqrt{\mathrm{Hz}}\) to take full advantage of the cooled mirror. SRON has developed TiAu TES bolometers for the short wavelength band (30–60 μm). The TES are on SiN membranes, in which long and narrow legs act as thermal links between the TES and the bath. We present a distributed model that accounts for the heat conductance and the heat capacity in the long legs that provides a guideline for designing low noise detectors. We report our latest results that include a measured dark NEP of \(4.2\times 10^{-19}~\mbox{W/}\sqrt{\mathrm{Hz}}\) and a saturation power of about 10 fW.

Keywords

Transition edge sensor TES Far infrared spectrometer Submm spectrometer SiN membrane Cryogenic detectors THz detectors