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Near infrared detectors for SNAP

  • Author(s): Schubnell, M.
  • Barron, N.
  • Bebek, C.
  • Brown, M.G.
  • Borysow, M.
  • Cole, D.
  • Figer, D.
  • Lorenzon, W.
  • Mostek, N.
  • Mufson, S.
  • Seshadri, S.
  • Smith, R.
  • Tarle, G.
  • et al.
Abstract

Large format (1k x 1k and 2k x 2k) near infrared detectors manufactured by Rockwell Scientific Center and Raytheon Vision Systems are characterized as part of the near infrared R&D effort for SNAP (the Super-Nova/Acceleration Probe). These are hybridized HgCdTe focal plane arrays with a sharp high wavelength cut-off at 1.7 um. This cut-off provides a sufficiently deep reach in redshift while it allows at the same time low dark current operation of the passively cooled detectors at 140 K. Here the baseline SNAP near infrared system is briefly described and the science driven requirements for the near infrared detectors are summarized. A few results obtained during the testing of engineering grade near infrared devices procured for the SNAP project are highlighted. In particular some recent measurements that target correlated noise between adjacent detector pixels due to capacitive coupling and the response uniformity within individual detector pixels are discussed.

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