Patent ID: 8580135

Claim:
A method of fabricating a mold that has an inverted motheye structure in its surface, the inverted motheye structure having a plurality of recessed portions whose two-dimensional size viewed in a direction normal to the surface is not less than 10 nm and less than 500 nm, the method comprising the steps of: (a) providing a mold base which includes a base made of glass or plastic, an inorganic underlayer provided on a surface of the base, a buffer layer provided on the inorganic underlayer, the buffer layer containing aluminum, and an aluminum layer provided on a surface of the buffer layer; (b) partially anodizing the aluminum layer to form a porous alumina layer which has a plurality of very small recessed portions; (c) after step (b), allowing the porous alumina layer to be in contact with an etching solution, thereby enlarging the plurality of very small recessed portions of the porous alumina layer; and (d) after step (c), further anodizing the porous alumina layer to grow the plurality of very small recessed portions.