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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 7 — Mar. 1, 2013
  • pp: C72–C77

Pixel scaling in infrared focal plane arrays

Peter B. Catrysse and Torbjorn Skauli  »View Author Affiliations


Applied Optics, Vol. 52, Issue 7, pp. C72-C77 (2013)
http://dx.doi.org/10.1364/AO.52.000C72


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Abstract

We discuss effects that arise in pixels of IR focal plane arrays (FPAs) when pixel size scales down to approach the wavelength of the incident radiation. To study these effects, we perform first-principles electromagnetic simulations of pixel structures based on a mercury–cadmium–telluride photoconductor for use in FPAs. Specifically, we calculate the pixel quantum efficiency and crosstalk as pixel size scales from 16 μm, which is in the range of current detectors, down to 0.75 μm, corresponding to subwavelength detectors. Our numerical results indicate the possibility of wavelength-size (4μm) and even subwavelength-size (1μm) pixels for IR FPAs. In addition, we explore opportunities that emerge for controlling light with subwavelength structures inside FPA pixels. As an illustration, we find that the low-pass filtering effect of a metal film aperture can exemplify the impact and the possible role that wavelength-scale optics plays in very small pixels.

© 2013 Optical Society of America

OCIS Codes
(040.3060) Detectors : Infrared
(110.0110) Imaging systems : Imaging systems
(110.3080) Imaging systems : Infrared imaging
(050.6624) Diffraction and gratings : Subwavelength structures

History
Original Manuscript: January 2, 2013
Revised Manuscript: January 22, 2013
Manuscript Accepted: January 23, 2013
Published: February 18, 2013

Citation
Peter B. Catrysse and Torbjorn Skauli, "Pixel scaling in infrared focal plane arrays," Appl. Opt. 52, C72-C77 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-7-C72

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