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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 1 — Jan. 1, 2013
  • pp: 22–24

Active and passive infrared imager based on short-wave and mid-wave type-II superlattice dual-band detectors

Edward Kwei-wei Huang, Abbas Haddadi, Guanxi Chen, Anh-Minh Hoang, and Manijeh Razeghi  »View Author Affiliations

Optics Letters, Vol. 38, Issue 1, pp. 22-24 (2013)

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A versatile dual-band detector capable of active and passive use is demonstrated using short-wave (SW) and mid-wave (MW) IR type-II superlattice photodiodes. A bilayer etch-stop scheme is introduced for back-side-illuminated detectors, which enhanced the external quantum efficiency both in the SWIR and MWIR spectral regions. Temperature-dependent dark current measurements of pixel-sized 27 μm detectors found the dark current density to be ~1 × 10-5 A/cm2 for the 4.2 μm cutoff MWIR channel at 140 K. This corresponded to a reasonable imager noise equivalent difference in temperature of 49 mK using F / 2.3 optics and a 10 ms integration time ( t int ), which lowered to 13 mK at 110 K using t int = 30 ms , illustrating the potential for high-temperature operation. The SWIR channel was found to be limited by readout noise below 150 K. Excellent imagery from the dual-band imager exemplifying pixel coincidence is shown.

© 2012 Optical Society of America

OCIS Codes
(040.2480) Detectors : FLIR, forward-looking infrared
(040.5160) Detectors : Photodetectors
(110.3080) Imaging systems : Infrared imaging
(230.0250) Optical devices : Optoelectronics

ToC Category:

Original Manuscript: October 30, 2012
Revised Manuscript: November 30, 2012
Manuscript Accepted: November 30, 2012
Published: December 20, 2012

Virtual Issues
March 26, 2013 Spotlight on Optics

Edward Kwei-wei Huang, Abbas Haddadi, Guanxi Chen, Anh-Minh Hoang, and Manijeh Razeghi, "Active and passive infrared imager based on short-wave and mid-wave type-II superlattice dual-band detectors," Opt. Lett. 38, 22-24 (2013)

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