Patent ID: 7450306
Filing Date: 2008-11-11
Classification: G02B

Abstract:
1. An optical filter comprising: a substrate; a plurality of contiguous identical lower filter cavities formed on the substrate, each of the lower filter cavities consisting of two high refractive index layers and one low refractive index layer sandwiched between the high refractive index layers, wherein each high refractive index layer of the lower filter cavities has a thickness equal to 0.5 times one eighth of a central wavelength associated therewith, and each low refractive index layer of the lower filter cavities has a thickness equal to 0.5 times one fourth of a central wavelength associated therewith; and a plurality of contiguous upper filter cavities formed on the lower filter cavities, each of the upper filter cavities consisting of two low refractive index layers and one high refractive index layer sandwiched between the low refractive index layers, wherein the plurality of upper filter cavities comprises: