A speckle-based approach to compressive hyperspectral imaging

French, Rebecca, Gigan, Sylvain and Muskens, Otto L. (2018) A speckle-based approach to compressive hyperspectral imaging. In Next-Generation Spectroscopic Technologies XI. vol. 10657, SPIE. pp. 1-8 . (doi:10.1117/12.2303993).

Record type: Conference or Workshop Item (Paper)

Abstract

Incorporating wavelength information into a monochrome image is of great interest for imaging spectroscopy. Here, we show that by exploiting the properties of multiple scattering materials, we can encode spectral information in a CMOS image, where the spectral resolution obtained is only limited by the scattering strength of the material. As a proof-of-concept, we demonstrate this technique using a thin multiple scattering layer of gallium phosphide nanowires and a microlens array. We achieve a spectral resolution of approximately 4 nm and a reconstructed image containing 64 pixels. We demonstrate that a computational technique which is commonly used in compressive sensing can be used to reconstruct both sparse and dense spectra, when undersampling and oversampling a signal, respectively. This method provides an ultra-compact solution to obtaining both spatial and spectral information in one measurement, for potential use in portable spectroscopy.

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