Patent ID: 8593728
Filing Date: 2013-11-26
Classification: G02B

Abstract:
1. A multilayer photonic structure comprising a plurality of coating layers of high index dielectric material having an index of refraction n H and a plurality of coating layers of low index dielectric material having an index of refraction n L , wherein: the plurality of coating layers of high index dielectric material and the plurality of coating layers of low index dielectric material are alternately arranged and a first coating layer and a last coating layer of the multilayer photonic structure comprise low index material; an index-thickness of each coating layer of low index dielectric material is different than the index-thickness of each other coating layer of low index dielectric material; an index-thickness of each coating layer of high index dielectric material is different than the index-thickness of each other coating layer of high index dielectric material; the index-thickness of each coating layer of low index dielectric material is different than the index-thickness of each coating layer of high index dielectric material; and the multilayer photonic structure has a first high reflectivity bandwidth, a second high reflectivity bandwidth and a low reflectivity bandwidth for electromagnetic radiation incident on a surface of the multilayer photonic structure in a range from 0 degrees to 45 degrees relative to a normal to the surface of the multilayer photonic structure, wherein the low reflectivity bandwidth is positioned between the first high reflectivity bandwidth and the second high reflectivity bandwidth.