Optical member having textured structure and method of producing same

摘要

An optical member has an antireflection coating (10) disposed on a substrate surface (8). The outermost layer of the antireflection coating (10) is a crystalline layer (2) having a textured structure containing aluminum oxide crystals. Part or the entire of the crystalline layer (2) contains a carboxylic acid compound (3). A method of producing an optical member includes a step (a) of forming an aluminum oxide layer (5) containing aluminum oxide on a substrate (1), a step (b) of forming crystalline layer (2) having a textured structure by bringing the aluminum oxide layer (5) into contact with hot water of 60°C or more and 100°C or less or water vapor, a step (c) of applying a coating liquid containing a carboxylic acid compound (3) and a solvent onto the crystalline layer (2), and a step (d) of removing the solvent of the coating liquid.