Patent ID: 8970955
Filing Date: 2015-03-03
Classification: B42D,G02B

Abstract:
1. A zero-order diffractive filter comprising: a first low-index matter; a second low-index matter; a high-index material comprising diffractive microstructures and having an upper surface and a lower surface, wherein the high-index material is positioned between the first low-index matter and the second low-index matter; wherein the lower surface of the high-index material is adjacent to the first low-index matter and wherein the upper surface is adjacent to the second low-index matter; wherein the high-index material has an index of refraction that is higher than a respective index of refraction of the first low-index matter and the second low-index matter, the high-index material acting as a waveguiding layer for guiding light between the first and second low-index matters; wherein the high-index material is laterally patterned on the low-index matter, such that at least one high-index-free area is present where the first low-index matter and the second low-index matter engage with each other and form a merged area and at least one non-merged area of high-index material is present forming with the first and second low index matter a zero-order diffractive structure, wherein the high-index material comprises a first portion of high-index material having diffractive microstructures and a first thickness laterally contiguous with a second portion of high-index material having diffractive microstructures and a second thickness different than the first thickness, and wherein the zero-order diffractive structure exhibits at the first and the second portions of the high-index material respective color effects.