Patent ID: 9513415
Filing Date: 2016-12-06
CPC Classification: G02B

Claim Text:
1. An optical filter that transmits light of a predetermined wavelength, the optical filter comprising: a substrate; a first conductive thin film in direct contact with the substrate and including a plurality of apertures arranged with a period of less than the predetermined wavelength; and a second conductive thin film at least a portion of which faces the apertures and is separated from the apertures; wherein a material of a film between the first and the second conductive thin films, a material filling the apertures, and a material filling a plurality of patterned gaps of the second conductive thin film are an identical material and contain a material selected from a group consisting of silicon oxide, silicon nitride, titanium oxide, and aluminum oxide, the second conductive thin film includes a coordination geometry pattern having a same period of arrangement as a pattern of the first conductive thin film, and the second conductive thin film includes a pattern that is reversed and differently sized than the pattern of the first conductive thin film.