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We have used quantum wells, quantum dots, and strained layer sperlattices for infrared detection and imaging. Quantum well infrared photodetectors (QWIPs) are based on GaAs/AlGaAs material system and the quantum dot infrared detector (QDIPs) are based on InAs/InGaAs/GaAs materials system. Strained layer superlattice (SLS) detectors are based on InAs/GaSb materials system and grown on GaSb substrates.
In the past decade, there has been active research on infrared detectors based on intersubband transitions in self-assembled quantum dots (QDs). In the past two years, at least four research groups have independently demonstrated focal plane arrays based on this technology. In this paper, the progress from the first raster scanned image obtained with a QD detector to the demonstration of a 640 512...
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