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REPORT DOCUMENTATION PAGEForm maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information ind udings uggestons for reducin g Ws burden to Department of Defense. Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington W 22202-4302 Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if ,t does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. 05-05-2000 REPORT DATE (DD-MM-YYYY) REPORT TYPE Journal Article TITLE AND SUBTITLE640x486 Long-Wavelength Two-Color GaAs/AlGaAs Quantum Well Infrared Photodetector (QWIP) Focal Plane Array Camera AUTHOR(S)Gunapala SD, Bandara SV, Singh A, Liu JK, Rafol SB, Luong EM, Mumolo JM, Tran NQ, Ting DZY, Vincent JD, Shott CA, Long J, LeVan PD PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)Air Force Research Laboratory 3 55 0 Aberdeen Ave. SE Kirtland AFB, NM 87117-5776 SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) DISTRIBUTION /AVAILABILITYSTATEMENTApproved for Public Release; Distribution is Unlimited. SUPPLEMENTARY NOTES DATES COVERED (From SPONSOR/MONITOR'S ACRONYM(S) SPONSOR/MONITOR'S REPORT NUMBER(S) 20021212 120We have designed and fabricated an optimized long-wavelength/very-long-wavelength two-color quantum well infrared photodetector (QWIP) device structure. The device structure was grown on a 3-in semiinsulating GaAs substrate by molecular beam epitaxy (MBE). The wafer was processed into several 640 x 486 format monolithically integrated 8-9 and 14-15 ßm two-color (or dual wavelength) QWIP focal plane arrays (FPA's). These FPA's were then hybridized to 640 x 486 silicon CMOS readout multiplexers. A thinned (i.e., substrate removed) FPA hybrid was integrated into liquid helium cooled dewar for electrical and optical characterization and to demonstrate simultaneous two-color imagery. The 8-9 /im detectors in the FPA have shown background limited performance (BLIP) at 70 K operating temperature for 300 K background with f/2 cold stop. The 14-15 /mi detectors of the FPA reach BLIP at 40 K operating temperature under the same background conditions. In this paper we discuss the performance of this long-wavelength dualband QWIP FPA in terms of quantum efficiency, detectivity, noise equivalent temperature difference (NE A T), uniformity, and operability. Abstract-We have designed and fabricated an optimized long-wavelength/very-long-wavelength two-color quantum well infrared photodetector (QWIP) device structure. The device structure was grown on a 3-in semi-insulating GaAs substrate by molecular beam epitaxy (MBE). The wafer was processed into several 640 x 486 format monolithically integrated 8-9 and 14-15 /im two-color (or dual wavelength) QWIP focal plane arrays (FPA's). Th...

Mid-wavelength infrared (MWIR) and long-wavelength infrared (LWIR) 1024 × 1024 pixel quantum well infrared photodetector (QWIP) focal planes have been demonstrated with excellent imaging performance. The MWIR QWIP detector array has demonstrated a noise equivalent differential temperature (NE T) of 17 mK at a 95 K operating temperature with f/2.5 optics at 300 K background and the LWIR detector array has demonstrated a NE T of 13 mK at a 70 K operating temperature with the same optical and background conditions as the MWIR detector array after the subtraction of system noise. Both MWIR and LWIR focal planes have shown background limited performance (BLIP) at 90 K and 70 K operating temperatures respectively, with similar optical and background conditions. In this paper, we will discuss the performance in terms of quantum efficiency, NE T , uniformity, operability and modulation transfer functions.

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We present dual-band infrared image data collected as part of the Multidomain Smart Sensors effort at the U. S. Army Research Laboratory (ARL). The goal of this effort is to produce large-format, staring focal plane arrays (FPAs) that are able to see the battlefield in both the 3 to 5-µm (mid-wave infrared or MWIR) and 8 to 12-µm (long-wave infrared or LWIR) atmospheric transmission windows. The data was collected under laboratory and field test conditions using a simultaneously integrating, pixel-registered, 256 x 256, dual-band focal plane array produced by Lockheed Martin using quantum-well infrared photodetector (QWIP) technology. The dual-band FPA was installed in a camera that was taken in the field to gather image data on military targets. The pixel-registered dual-band FPA is well suited for the application of image fusion algorithms. We also applied some of these image fusion techniques to the imagery to enhance the visibility of targets.