25 August 2009 Hyperspectral pixels in 2D imaging FPAs?
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Abstract
Dualband infrared focal plane arrays (FPA), developed for multi-spectral imaging applications, have advantages over conventional multi-FPA sensor configurations in compactness and band-to-band pixel registration. These FPAs have also enabled hyperspectral applications that employ gratings used in two orders, allowing high efficiency hyperspectral imaging over very broad wavelength regions. As time progresses, multi-waveband FPAs are expected to provide an increase in spectral information at the pixel level without the need for external, dispersive optical elements. A variation on this approach, described here, uses detector material of fixed composition, with waveband sensitivity achieved as a function of depth, made possible by the spectral dependence of the absorption coefficient. An increase in the number of wavebands provides hyperspectral capability at the pixel level, hereafter denoted hyperspectral pixel. This technology may someday become possible through advanced detector array architectures, with photons of different wavelength continuously absorbed at different depths, and their resulting photocurrents isolated with a vertical grid of contacts or an equivalent mechanism for transporting depth-dependent signal photocurrent to a read-out circuit unit cell.
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Paul D. LeVan, Paul D. LeVan, Brian P. Beecken, Brian P. Beecken, } "Hyperspectral pixels in 2D imaging FPAs?", Proc. SPIE 7467, Nanophotonics and Macrophotonics for Space Environments III, 74670L (25 August 2009); doi: 10.1117/12.827682; https://doi.org/10.1117/12.827682
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