The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 23, 2021
Filed:
Jun. 07, 2018
Government of the United States, As Represented BY the Secretary of the Air Force, Wright-Patterson AFB, OH (US);
Dean R Evans, Beavercreek, OH (US);
Ighodalo U Idehenre, Tipp City, OH (US);
Nelson V Tabiryan, Winter Park, FL (US);
Timothy J Bunning, Beavercreek, OH (US);
United States of America as represented by the Secretary of the Air Force, Wright-Patterson AFB, OH (US);
Abstract
A spectrally-selective reflective optical film comprises at least two anisotropic layers, each of the layers having a phase retardation value and an optical axis orientation pattern within the layer; the optical axis orientation patterns exhibiting a discontinuity at the boundary of the at least two layers; and at least one substrate holding the film. At least a part of the anisotropic layers may be chiral. The materials comprising the anisotropic layers may be selected from liquid crystal polymers, azobenzene liquid crystal polymers, liquid crystals, azobenzene liquid crystals, polymer films with stressed birefringence, and combinations thereof. The materials comprising the anisotropic layers may be doped with at least one dopant from the list comprising nanorods, photorefractive nanoparticles, photovoltaic nanoparticles, lasing dyes, and combinations of thereof. The anisotropic layers may be transparent to infrared wavelengths. The anisotropic layers may be arranged in a periodic pattern of retardation values, including zero.