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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 33 — Nov. 20, 2012
  • pp: 7987–7993

Simulation and experimental characterization of the point spread function, pixel saturation, and blooming of a mercury cadmium telluride focal plane array

Grant Soehnel and Anthony Tanbakuchi  »View Author Affiliations

Applied Optics, Vol. 51, Issue 33, pp. 7987-7993 (2012)

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A custom IR spot scanning experiment was constructed to project subpixel spots on a mercury cadmium telluride focal plane array (FPA). The hardware consists of an FPA in a liquid nitrogen cooled Dewar, high precision motorized stages, a custom aspheric lens, and a 1.55 and 3.39 μm laser source. By controlling the position and intensity of the spot, characterizations of cross talk, saturation, blooming, and (indirectly) the minority carrier lifetime were performed. In addition, a Monte–Carlo-based charge diffusion model was developed to validate experimental data and make predictions. Results show very good agreement between the model and experimental data. Parameters such as wavelength, reverse bias, and operating temperature were found to have little effect on pixel crosstalk in the absorber layer of the detector. Saturation characterizations show that these FPAs, which do not have antiblooming circuitry, exhibit an increase in cross talk due to blooming at 39% beyond the flux required for analog saturation.

© 2012 Optical Society of America

OCIS Codes
(040.1240) Detectors : Arrays
(040.3060) Detectors : Infrared
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology

ToC Category:

Original Manuscript: August 28, 2012
Revised Manuscript: October 17, 2012
Manuscript Accepted: October 18, 2012
Published: November 19, 2012

Grant Soehnel and Anthony Tanbakuchi, "Simulation and experimental characterization of the point spread function, pixel saturation, and blooming of a mercury cadmium telluride focal plane array," Appl. Opt. 51, 7987-7993 (2012)

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