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640 × 512 pixel narrow-band, four-band, and broad-band quantum well infrared photodetector focal plane arrays |
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| Authors: | S. D. Gunapala S. V. Bandara J. K. Liu S. B. Rafol J. M. Mumolo C. A. Shott R. Jones J. Woolaway II J. M. Fastenau A. K. Liu M. Jhabvala K. K. Choi |
| Affiliation: | a Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA b Indigo Systems Corporation, Santa Barbara, CA 93111, USA c IQE Inc., Bethlehem, PA 18015, USA d NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA e Army Research Laboratory, Adelphi, MD 20783, USA |
| Abstract: | A 9 μm cutoff 640 × 512 pixel hand-held quantum well infrared photodetector (QWIP) camera has been demonstrated with excellent imagery. A noise equivalent differential temperature (NEDT) of 10.6 mK is expected at a 65 K operating temperature with f/2 optics at a 300 K background. This focal plane array has shown background limited performance at a 72 K operating temperature with the same optics and background conditions. In this paper, we discuss the development of this very sensitive long-wavelength infrared camera based on a GaAs/AlGaAs QWIP focal plane array and its performance in quantum efficiency, NEDT, uniformity, and operability. In the second section of this paper, we discuss the first demonstration of a monolithic spatially separated four-band 640 × 512 pixel QWIP focal plane array and its performance. The four spectral bands cover 4–5.5, 8.5–10, 10–12, and 13.5–15 μm spectral regions with 640 × 128 pixels in each band. In the last section, we discuss the array performance of a 640 × 512 pixel broad-band (10–16 μm full-width at half-maximum) QWIP focal plane. |
| Keywords: | Focal plane arrays QWIPs Hyper-spectral Multi-spectral Broad-band Multi-band Long-wavelength Infrared (LWIR) Hand-held infrared camera |
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