Radiometric characterization of long-wavelength infrared type II strained layer superlattice focal plane array under low-photon irradiance conditions

John E. Hubbs, Vaidya Nathan, Meimei Tidrow, Manijeh Razeghi

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We present the results of the radiometric characterization of an "M" structure long wavelength infrared Type-II strained layer superlattice (SLS) infrared focal plane array (IRFPA) developed by Northwestern University (NWU). The performance of the M-structure SLS IRFPA was radiometrically characterized as a function of photon irradiance, integration time, operating temperature, and detector bias. Its performance is described using standard figures of merit: responsivity, noise, and noise equivalent irradiance. Assuming background limited performance operation at higher irradiances, the detector quantum efficiency for the SLS detector array is approximately 57%. The detector dark density at 80 K is 142 μA/cm 2, which represents a factor of seven reduction from previously measured devices.

Original languageEnglish (US)
Article number064002
JournalOptical Engineering
Volume51
Issue number6
DOIs
StatePublished - Jun 1 2012

Keywords

  • Infrared detectors
  • Infrared focal plane array
  • Low photon irradiance
  • Strained layer superlattice detectors

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering(all)

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