Quantum Well Infrared Photodetector FPA
Final rept. 1 Sep 1991-28 Feb 1993,
ROCKWELL INTERNATIONAL CORP THOUSAND OAKS CA SCIENCE CENTER
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The ATTRockwell team met all the objectives of this collaborative program ATT supplied the QWIP detector arrays and Rockwell subsequently fabricated hybrid focal plane arrays using available high performance CMOS multiplexers, tested the hybrids, performed breadboard imaging demonstrations and delivered several hybrid FPAs. Eighteen hybrids were fabricated and evaluated. The collaboration yielded significant improvements in QWIP FPA performance and reliability and many milestones including first BLIP LWIR FPA sensitivity demonstration at low photon backgrounds 1 x 10 to the 12th photonssq cm-sec with the GaAs-based quantum well infrared photodetector QWIP technology, high LWIR FPA pixel operability. NE Delta Ts as low as 5 mK at LWIR imaging backgrounds at f1.4 and temperatures consistent with mechanical coolers approx. 65K, increased coupling efficiency by over an order of magnitude achieved effective quantum efficiency of approx. 10 with low crosstalk. effective quantum efficiencies of up to 30 under flood illumination, though with high crosstalk, mean D of 1 x 10 to the 14th cm-Hz to the 12w at 3.0 x 10 to the 9th photonssq cm-sec background at 32.5K operating temperature with 98 operability. maximum temperature for 9.5 microns m FPA BLIP sensitivity as high as 62K, excellent hybrid reliability by mechanically thinning the QWIP, responsivity nonuniformity 3 rms, thus enabling 83 dB dynamic range.
- Infrared Detection and Detectors