摘要:
An optical element, which has an antireflection performance offering excellent wavelength band characteristics and incident angle characteristics, includes a substrate and structures that each are formed of a convex portion and that are arranged in plural on a surface of the substrate at a fine pitch equal to or less than a wavelength of light. Each of the structures has a quadrangular pyramid shape or a truncated quadrangular pyramid shape that has a quadrangular bottom surface, and each of four sides that farm the quadrangular bottom surface is curved toward a center of the bottom surface.