Corrugated Quantum Well Infrared Photodetector Focal Plane Array Test Results
ARMY RESEARCH LAB ADELPHI MD
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The corrugated quantum-well infrared photodetector C-QWIP uses total internal reflection to couple normal incident light into the optically active quantum wells. The coupling efficiency has been shown to be relatively independent of the pixel size and wavelength thus making the C-QWIP a candidate for detectors over the entire infrared spectrum. The broadband coupling efficiency of the C-QWIP makes it an ideal candidate for multiwavelength detectors. We fabricated and tested C-QWIP focal plane arrays FPAs with cutoff wavelengths of 11.2 and 16.2 micrometers. Each FPA has 256 x 256 pixels that are bump-bonded to a direct injection readout circuit. Both FPAs provided infrared imagery with good aesthetic attributes. For the 11.2-micrometers FPA, background-limited performance BLIP was observed at 60 K with f3 optics. For the 16.2-micrometers FPA, BLIP was observed at 38 K. Besides the reduction of dark current in C-QWIP structures, the measured internal quantum efficiency eta remains to be high. The values for responsivity and quantum efficiency obtained from the FPA results agree well with those measured for single devices.
- Electrooptical and Optoelectronic Devices
- Quantum Theory and Relativity