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19 February 2014 Flexible optical-infrared metafilter
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By combining the antireflective properties from gradual changes in the effective refractive index and cavity coupling from cone gratings, and the efficient optical behavior of a tungsten film, we have conceived a flexible filter showing very broad antireflective (AR) properties from the visible to short wavelength infrared region (SWIR: 0.7-1.5 μm) and simultaneously a mirror-like behavior in the mid-infrared wavelength region (MWIR: 3-5 μm) and long-infrared wavelength region (LWIR: 8 to 15 μm). Nanoimprint technology has permitted us to replicate inverted cone patterns on a large scale on a flexible polymer, afterwards coated with a thin tungsten film. This optical metafilter is of great interest in the stealth domain where optical signature reduction from the optical to SWIR region is an important matter. As it also acts as selective thermal emitter offering a good solar-absorption/ infrared-emissivity ratio, interests are found as well for solar heating applications.
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Jean-Baptiste Brückner, Vincent Brissonneau, Judikaël Le Rouzo, Abdelkerim Ferchichi, Cécile Gourgon, Christophe Dubarry, Gérard Berginc, and Ludovic Escoubas "Flexible optical-infrared metafilter", Proc. SPIE 8994, Photonic and Phononic Properties of Engineered Nanostructures IV, 89941L (19 February 2014);

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