Active and passive infrared imager based on short-wave and mid-wave type-II superlattice dual-band detectors.
Opt Lett
; 38(1): 22-4, 2013 Jan 01.
Article
en En
| MEDLINE
| ID: mdl-23282825
ABSTRACT
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/cm(2) 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.
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1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Opt Lett
Año:
2013
Tipo del documento:
Article
País de afiliación:
Estados Unidos