Patent ID: 7422842

Claim:
A method for creating a diffractive structure, comprising: designing a base diffractive structure providing a desired function at a design wavelength; designing an anti-reflective diffractive structure having a period that is smaller than the design wavelength, wherein a depth of the anti-reflective structure is on an order of a depth of the base diffractive structure; adding designs for the base diffractive structure and the anti-reflective diffractive structure to form a combined design; optimizing the combined design for acceptable performance of the desired function and minimized reflection, the optimizing including altering at least one of a depth of the base diffractive structure, a depth of the anti-reflective diffractive structure, and a period of the anti-reflective diffractive structure, to determine an optimized design, the optimized design deviating from the combined design; and creating the optimized design on a surface.