Arguably one of the simplest device realizations of the classic particle-in-a-box problem of basic quantum mechanics is the Quantum Well Infrared Photodetector (QWIP). Optimization of the detector design and material growth and processing has culminated in the realization of a portable infrared camera with a large (256 x 256 pixel ) focal plane array of QWIPs which can see at 8.5 um, holding forth great promise for a variety of applications in the 8-14 um wavelength range. In this paper we discuss the physics and technology of the QWIP and report on the performance of the world's first hand-held infrared camera at these long wavelengths.
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