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Dye and pigment-free structural colors and angle-insensitive spectrum filters

United States Patent

9,547,107
January 17, 2017
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
Optical spectrum filtering devices displaying minimal angle dependence or angle insensitivity are provided. The filter comprises a localized plasmonic nanoresonator assembly having a metal material layer defining at least one nanogroove and a dielectric material disposed adjacent to the metal material layer. The dielectric material is disposed within the nanogroove(s). The localized plasmonic nanoresonator assembly is configured to funnel and absorb a portion of an electromagnetic spectrum in the at least one nanogroove via localized plasmonic resonance to generate a filtered output having a predetermined range of wavelengths that displays angle insensitivity. Thus, flexible, high efficiency angle independent color filters having very small diffraction limits are provided that are particularly suitable for use as pixels for various display devices or for use in anti-counterfeiting and cryptography applications. The structures can also be used for colored print applications and the elements can be rendered as pigment-like particles.
Guo; Lingjie Jay (Ann Arbor, MI), Hollowell; Andrew E. (Albuquerque, NM), Wu; Yi-Kuei (Bloomington, MN)
The Regents Of The University Of Michigan (Ann Arbor, MI)
14/ 210,742
March 14, 2014
GOVERNMENT RIGHTS This invention was made with government support under ECCS1202046 awarded by the National Science Foundation. This invention was developed under Contract DE-AC04-94AL85000 between Sandia Corporation and the U.S. Department of Energy. The U.S. Government has certain rights in this invention.