Patent ID: 7838204

Claim:
A method of forming an optical device comprising: selecting a transmissive apertures pattern by generating a plurality of cell mask areas, the cell mask areas disposed in an XY matrix, all of the cell mask areas having a substantially identical pattern of transmissive aperture locations; forming transmissive apertures, corresponding to the transmissive apertures pattern, in a mask; providing a layer of photopolymerizable material on a substrate; illuminating the mask with light to selectively photopolymerize the layer of photopolymerizable material; and removing photopolymerizable material left unpolymerized after the illuminating the mask with light such that the substrate includes device structures corresponding to the transmissive apertures; wherein each of the device structures has a bottom and a top, wherein the bottom is between the top and the substrate, wherein cross-sections adjacent the tops of the device structures have smaller areas than cross-sections adjacent the bottoms of the device structures, wherein the photopolymerizable material is transmissive after polymerization, and wherein the device structures, viewed over the substrate as a whole, appears randomly placed and macroscopically uniform without an apparent grid pattern.