Patent ID: 8398871
Filing Date: 2013-03-19
Classification: G02B

Abstract:
1. A method for designing a set of at least two multi-layer optical filters for fabrication on a substrate including (i) a first optical filter that exhibits a first filter performance that satisfies a first preset criterion and (ii) a second optical filter that exhibits a second filter performance that satisfies a second preset criterion and is different from said first filter performance, said method comprising: (a) providing an initial first filter design for the first optical filter, as a first ordered stack of layers on the substrate, and an initial second filter design for the second optical filter, as a second ordered stack of layers on the substrate; (b) selecting a pair of layers, including a first layer of a material, characterized by a first thickness, from said first ordered stack of layers, and a second layer of the material, characterized by a second thickness, from said second ordered stack of layers; (c) constraining the first thickness to a first constrained thickness that is a positive integer multiple of the second thickness so as to yield a constrained first filter design; (d) evaluating a predicted performance of the constrained first filter design; and (e) comparing the predicted performance of the constrained first filter design with the first preset criterion as at least one input for one of accepting and rejecting the constrained first filter design.