Patent ID: 8335029
Filing Date: 2012-12-18
Classification: B29D,B82Y,G02B

Abstract:
1. A method for producing an array of micromirror structures each having a nanostructure on its top comprising: (a) providing a transparent substrate having a cladding layer on top of the substrate and a first hard mask layer on the top of the cladding layer, wherein the cladding layer and first hard mask layers are patterned to have features extending through both layers to the substrate, the pattern having small features and large features, the small features having a lateral dimension that is smaller than the smallest lateral dimension of the large features; (b) masking the small features with either a second hard mask layer or a resist; (c) etching the substrate to produce depressions in regions of the substrate corresponding to the large features while not etching the regions of the substrate corresponding to the small features; (d) undercutting the first hard mask layer; (e) depositing a reflective layer such that the deposited reflective layer has discontinuities corresponding to areas wherein the first hard mask layer has been undercut; and (f) removing the first hard mask layer and the resist or the second hard mask layer, thereby removing the reflective layer over the regions of the substrate comprising the small features, thereby producing micromirror structures, each having a nanostructure on its top.