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Optical Engineering

Radiometric characterization of long-wavelength infrared type II strained layer superlattice focal plane array under low-photon irradiance conditions
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Paper 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/cm2, which represents a factor of seven reduction from previously measured devices.

Paper Details

Date Published: 8 June 2012
PDF: 9 pages
Opt. Eng. 51(6) 064002 doi: 10.1117/1.OE.51.6.064002
Published in: Optical Engineering Volume 51, Issue 6
Show Author Affiliations
John E. Hubbs, Air Force Research Lab. (United States)
Vaidya Nathan, Air Force Research Lab. (United States)
Meimei Z. Tidrow, U.S. Army Night Vision & Electronic Sensors Directorate (United States)
Manijeh Razeghi, Northwestern Univ. (United States)

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