Development of a 4–15 μm infrared GaAs hyperspectral QWIP imager

Multi-band and broad-band infrared detectors based on III–V materials for spectral imaging instruments

“…A 640 · 512 format spatially separated fourband QWIP (FPA) based on a InGaAs/GaAs/AlGaAs material system has been developed for a hyperspectral imaging instrument sensitive in selected wavelength bands within a wavelength range from 4 to 15.5 lm [8,9,11]. Fig.…”

“…However, if the required wavelength coverage is wider than that of a broad-band QWIP spectrum, the only option available is to utilize a multi-broad-band FPA. Recently we have delivered both types of QWIP FPAs: (a) a 640 · 512 four-band QWIP FPA for hyperspectral imager [8,9,11] and (b) a 640 · 512 dual-broad-band QWIP FPA for a miniature interferometer [4,10]. This article focuses on design issues of multi-band QWIP layer structures and the tailorability and tunability of the broad-band QWIPÕs spectral responsivity.…”

Development of a 1K×1K, 8–12μm QWIP array

“…It was only in the late 1980s that single element, angle lapped QWIPs were developed and used [1]. In the 1990s rapid development from single element QWIPs to 512 · 640 arrays [2][3][4] occurred across a broad spectrum of the near to far infrared. With the concurrent development of large format silicon readout ICs it has been a relatively simple task for QWIP technology to keep pace.…”

“…Unfortunately narrow band detectors, which QWIPs tend to be, pretty much preclude multi-wavelength spectroscopy. To this end, we have developed a broad band, large format QWIP array as part of NASA's Earth Science Technology program for Advanced Component Technology development [6].…”

Advanced characterization of the radiometric performances of quantum well infrared photodetectors

“…Indeed, QWIP focal plane arrays emerge as rather good candidates for several applications [2,3] (such as multispectral or hyperspectral imagers [4] for example), thanks to their very good uniformity and to the possibility of tailoring the spectral response by band-gap engineering. However, the need to use a light coupling scheme to overcome the polarization selection rule [5] may affect the QWIPsÕ performances.…”