Patent ID: 7349612
Filing Date: 2008-03-25
Classification: B82Y,G02B

Abstract:
1. An optical element comprising a structure having at least one convex portion and at least one concave portion formed so as to be adjacent to either one of the convex portions in a core layer, the core layer being interposed between an upper cladding layer which covers one surface of the structure and a lower cladding layer and the core layer having a refractive index higher than those of the upper cladding layer and the lower cladding layer, and the optical element having a hollow portion, wherein an aspect ratio of the concave portion is set to be 2 or more, the aspect ratio being a depth/width ratio of the concave portion, wherein the upper cladding layer is formed by a deposition process such that the height of the hollow portion is the same as the depth of the concave portion, wherein the structure is placed on a substrate or on a solid layer stacked above the substrate, and wherein the structure is a diffraction grating for first-order diffracting incident light.