Patent ID: 8221963

Claim:
A method for producing a fine structure, comprising: (a) forming a photosensitive film to cover a plurality of first convex portions formed in at least one surface of a substrate; (b) arranging liquid to cover the photosensitive film; (c) arranging a transparent parallel plate such that the parallel plate is opposite to the substrate via the liquid; (d) generating interference field by a laser beam to irradiate the interference field onto the photosensitive film via the parallel plate and the liquid; (e) removing the liquid and the parallel plate to develop the photosensitive film so as to form a photosensitive film pattern; and (f) etching the substrate using a mask of the photosensitive film pattern to form a plurality of fine convex portions smaller than the first convex portions on the at least one surface of the substrate, wherein the liquid arranged at step (b) has a first refractive index larger than 1 and equal to or smaller than a second refractive index of the photosensitive film.