Free-standing subwavelength metallic gratings for snapshot multispectral imaging

Haïdar, Riad; Vincent, Grégory; Collin, Stéphane; Bardou, Nathalie; Guérineau, Nicolas; Deschamps, Joël; Pelouard, Jean-Luc
May 2010
Applied Physics Letters;5/31/2010, Vol. 96 Issue 22, p221104
Academic Journal
A mosaic of ten spectral filters has been fabricated in a single 20 mm2 membrane drilled by nanoslits and coated by a gold layer. The nanostructured core-shell gratings exhibit 70% average maximum transmission efficiency in 15% aperture area, which represents a fivefold enhancement compared to the geometrical transmission. This mosaic of bandpass filters regularly spaced in the 3–5 μm wavelength range is used to demonstrate real-time spectral imaging in a multichannel camera.


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