Patent ID: 8213083
Filing Date: 2012-07-03
Classification: G01N,G02B

Abstract:
1. A wavelength selection filter selectively resonating and reflecting light of a given wavelength contained in incident light, comprising: a substrate having a rectangular waveform concave and convex structure which is formed on a plane on which the incident light falls incident, the concave and convex structure including convex portions and concave portions which are arranged in one axial direction; and a multilayer structure including a first layer and a second layer respectively coating one and the other one of side surfaces, in the one axial direction, of each of convex portions of the concave and convex structure, wherein a refractive index of the first layer and a refractive index of the second layer are both higher than a refractive index of the substrate, wherein the multilayer structure includes a third layer located between the first layer and the second layer in the one axial direction, and a refractive index of the third layer is lower than the refractive index of the substrate, wherein, in the one axial direction, a width of each convex portion of the concave and convex structure, a width of the first layer, a width of the second layer, and a width of the third layer are equal to one another, and wherein the first layer and the second layer are substantially transparent.