Patent ID: 9417366
Filing Date: 2016-08-16
CPC Classification: G02B

Claim Text:
1. An optical device comprising: a substrate having a top surface; a periodic pattern formed in the top surface of the substrate in a first direction; a plurality of dielectric layers deposited on the top surface of the substrate and having a shape that conforms to the periodic pattern; a top dielectric layer deposited on the plurality of dielectric layers so that the top dielectric layer has the shape of the periodic pattern, said top dielectric layer having a top surface and a thickness greater than the thickness of any of the plurality of dielectric layers; and a periodic grating formed through the top surface and into the top dielectric layer, said periodic grating having channels that extend along a second direction substantially orthogonal to the first direction where the periodic pattern is formed into the periodic grating so that the pattern crosses the channels.