Patent ID: 7755835
Filing Date: 2010-07-13
Classification: B29C,B42D,B82Y,G02B,G03H

Abstract:
1. A zero order diffractive filter for polarised or unpolarised polychromatic light, comprising a medium having a low index of refraction n low and a waveguiding layer with high index of refraction n high and having gradient regions, said medium and said waveguiding layer being arranged so as to form grating lines of a microstructure, said grating lines having a period length ranging from 200 nm to 1500 nm; wherein at least one interface between said medium with low refraction index and said waveguiding layer is nanostructured by a plurality of single nanostructures being at least one of organic and dielectric nanostructures; wherein said plurality of single nanostructures have lateral dimensions that are smaller than the grating period length; wherein said plurality of single nanostructures are embedded in said gradient region of said waveguiding layer; and wherein said plurality of single nanostructures have the effect of a virtual layer at said at least one interface between said medium and said waveguiding layer with an effective index of refraction n