Wavelength selection filter, filter unit, light source device, optical apparatus, and refractive index sensor

摘要

A wavelength selection filter (101) selectively resonating and reflecting light of a given wavelength contained in incident light, includes a substrate (101 a) 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 (X); and a multilayer structure (101b) including a first layer (101b1) and a second layer (101b2) 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. 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.