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Hyperspectral and Pixelated Filter Array for Long-Wave IR Focal Plane Array Integration

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We present the design, fabrication, and characterization of a pixelated, hyperspectral arrayed component for Focal Plane Array (FPA) integration in the Long-Wave IR. This device contains tens of pixels within a single super-pixel which is tiled across the extent of the FPA. Each spectral pixel maps to a single FPA pixel with a spectral FWHM of 200 nm. With this arrayed approach, remote sensing data may be accumulated with a non-scanning, "snapshot" imaging system. To maximize the signal-to-noise ratio, the pixelated filter array must be placed very close to the detecting FPA so that diffraction effects are mitigated. We quantify the diffraction effects in the design and layout of this pixelated filter component where pixel dimensions are only a few wavelengths. The technology allows for flexible location of individual pixel center wavelengths and of pixel positions within the array. Finally, an entire pixel area has a single wavelength response, not the integrated linear response of a graded cavity thickness design.
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Keywords: DIFFRACTION; FABRY-PEROT; FILTER ARRAY; FOCAL PLANE ARRAY; HYPERSPECTRAL; LONG-WAVE IR; MULTISPECTRAL; OPTICAL INTEGRATION; PIXELATED; SNAPSHOT IMAGING; SUPER-PIXEL

Document Type: Short Communication

Publication date: June 1, 2010

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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