Abstract
We report the fabrication and characterization of a simple and compact hyperspectral imaging setup based on a stretchable diffraction grating made with a metal-polymer nanocomposite. The nanocomposite is produced by implanting Ag clusters in a poly(dimethylsiloxane) film by supersonic cluster beam implantation. The deformable grating has curved grooves and is imposed on a concave cylindrical surface, thus obtaining optical power in two orthogonal directions. Both diffractive and optical powers are obtained by reflection, thus realizing a diffractive-catoptric optical device. This makes it easier to minimize aberrations. We prove that, despite the extended spectral range and the simplified optical scheme, it is actually possible to work with a traditional CCD sensor and achieve a good spectral and spatial resolution.
Highlights
Hyperspectral imaging (HSI) is a technology where traditional optical or infrared imaging is combined with spectroscopic analysis of any particular object or landscape
We report the fabrication and characterization of a simple and compact hyperspectral imaging setup based on a stretchable diffraction grating made with a metal-polymer nanocomposite
The deformable grating has curved grooves and is imposed on a concave cylindrical surface, obtaining optical power in two orthogonal directions. Both diffractive and optical powers are obtained by reflection, realizing a diffractive-catoptric optical device
Summary
Hyperspectral imaging (HSI) is a technology where traditional optical or infrared imaging is combined with spectroscopic analysis of any particular object or landscape This is often obtained by using diffraction optics that disperse different wavelengths of light, together with sensors able to capture and to build a wavelength–intensity map of a scene with a very high spatial resolution.. Alternative fabrication methods are based on the interference fringe field in a photoresist to create a holographic grating or subtractive technologies such as electron beam lithography, ion beam etching, and laser ablation Such methods are very effective, expensive and requiring complex hardware.. By sticking gratings with proper circular grooves on concave cylindrical surfaces, it is possible to impose optical power in the direction perpendicular to the axis of symmetry of the cylinder, achieving focalization in this direction In such a way, astigmatic wavefronts can be obtained at will, the stigmatic case being just the particular case exploited here. Compared to rigid curved gratings, our solution achieves a smaller spectral resolution; on the other hand, it is much less demanding in terms of fabrication complexity and costs
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