Patent ID: 9557461
Date: 2017-01-31
CPC Classifications: G02B

Claim:
1. A two-dimensionally periodic, color-filtering grating, comprising a contiguous high-refractive metallic ground layer defining a grating plane and above the ground layer a two-dimensionally regular pattern of individual high-refractive including metallic areal elements that respectively extend parallel to the grating plane and respectively are spaced apart from the ground layer through an intermediate dielectric by a distance greater than the thickness of the ground and of the areal elements, wherein the ground layer has an opening below each areal element, wherein the regular pattern has in at least two directions, which run parallel to the grating plane, a periodicity between 100 nm and 800 nm, wherein the metallic ground layer and metallic areal elements include trilayers having two semitransparent metal layers and an interjacent dielectric spacer layer.