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 μm. Each FPA has 256 × 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-μm FPA, background-limited performance (BLIP) was observed at 60 K with f/3 optics. For the 16.2-μm FPA, BLIP was observed at 38 K. Besides the reduction of dark current in C-QWIP structures, the measured internal quantum efficiency (η) remains to be high. The values for responsivity and quantum efficiency obtained from the FPA results agree well with those measured for single devices.
It would seem that the use of word "corrugate" is used simply to describe the surface of these devices. Can anyone explain more precisely what it is (or how it's different from a simple quantum well) and perhaps point me in the direction to find out more (I've tried nonhub.org)?