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Title: Inverted cones grating for flexible metafilter at optical and infrared frequencies

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, a flexible filter showing very broad antireflective properties from the visible to short wavelength infrared region and, simultaneously, a mirror-like behavior in the mid-infrared wavelength region and long-infrared wavelength region has been conceived. Nanoimprint technology has permitted the replication of 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 short wavelength infrared 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.
Authors:
; ;  [1] ; ;  [2] ; ;  [3] ;  [4]
  1. Aix-Marseille Université, IM2NP, CNRS-UMR 7334, Domaine Universitaire de Saint-Jérôme, Service 231, 13397 Marseille Cedex 20 (France)
  2. CEA-LITEN DTNM, 17 Avenue des Martyrs, 38054 Grenoble cedex 9 (France)
  3. LTM CNRS, Laboratoire des Technologies de la Microélectronique 17 Avenue des Martyrs, 38054 Grenoble cedex 9 (France)
  4. Thales Optronique S.A., 2 Avenue Gay Lussac, 78990 Elancourt (France)
Publication Date:
OSTI Identifier:
22293054
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 8; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CAVITY RESONATORS; EMISSIVITY; GRATINGS; INFRARED SPECTRA; POLYMERS; REFRACTIVE INDEX; SOLAR HEATING; THIN FILMS; TUNGSTEN; VISIBLE SPECTRA; WAVELENGTHS