Patent ID: 8778195

Claim:
A method to fabricate an imprint mould in three dimensions comprising at least: a) forming at least one trench, of width W and depth h, in a substrate, thereby forming three surfaces including, a bottom of the at least one trench, sidewalls of the at least one trench, and a remaining surface of the substrate, called top of the substrate, b) forming alternate layers in the at least one trench, each having at least one portion perpendicular to the substrate, in a first material and in a second material which can be selectively etched relative to the first material, the at least one trench also including a third material limiting or inhibiting deposit of alternate layers formed on the top of the substrate, the alternate layers then being deposited solely in the at least one trench, thinning being performed subsequently so as to expose a field of the substrate, and c) selectively etching said portions of the layers perpendicular to the substrate, thereby forming a topology including at least, first patterns whose top lies at a first level relative to a surface of the substrate, located either side of said topology, these first patterns being in a first material, and second patterns having at least a second level relative to said surface of the substrate, different from and lower than the first level, these second patterns being in a second material.