OPTICAL FILTER, METHOD FOR PRODUCTION OF THE SAME, AND OPTICAL DEVICE EQUIPPED WITH THE SAME

摘要

The object is to provide: an optical filter which has a simple structure, which can be produced at low cost, and which has narrow lot-to-lot variations in its optical properties; a method for producing the optical filter; and an optical device. Disclosed is an optical filter (P) comprising a base material (S) and a multi-layered film (M) which can absorb light and which is formed on the surface of the base material (S), wherein the multi-layered film (M) comprises a dielectric film (F) which is composed of two or more films laminated on each other and an absorption film (A) which is formed in at least one space selected from spaces formed between the two or more films constituting the dielectric film (F) and which can absorb light. The dielectric film (F) comprises at least two films laminated on each other, wherein the at least two films are independently selected from a first film (F1) which comprises an oxide, nitride or oxynitride of a metal element (X) and a second film (F2) which comprises an oxide, nitride or oxynitride of a metal element (Y) or an oxide, nitride or oxynitride of an alloy of the metal element (X) and the metal element (Y). The absorption film (A) contains one or both of the metal element (X) and the metal element (Y).