Patent ID: 7608194

Claim:
A method for making a photonic periodic structure, the method comprising the steps of: a) providing a substrate; b) depositing at least one planar layer comprising two or more sublayers having different sublayer refractive indices; c) depositing a chemical-mechanical-polishing (CMP) stop layer; d) depositing a resist layer; e) patterning the resist layer by nano-imprint lithography to impress recesses into the resist layer in accordance with a desired periodicity; f) directionally etching to remove resist from the recesses in the resist layer, whereby first openings are formed in the resist layer; g) depositing a hard mask material over the resist layer and into the first openings; h) removing the resist, while leaving a periodic pattern of hard mask material only where previously deposited in the first openings; i) selectively etching through the at least one planar layer in accordance with the periodic pattern of hard mask material to form second openings, whereby the photonic periodic structure is formed.