Patent ID: 6485894
Filing Date: 2002-11-26
Classification: G03F

Abstract:
A method to self-align a lithographic pattern to a workpiece, the method comprisingobtaining a workpiece having a predetermined pattern of features; modifying at least some of the features so that when a photoresist material is applied to the pattern, there is a substantial difference in reflectivity between two adjacent features, at least one of which has been modified; applying a photoresist material to the pattern in a predetermined thickness according to at least the refractive index of the photoresist and a wavelength of an incident beam that exposes the photoresist material; masklessly exposing the photoresist material with an incident beam of light; developing said photoresist material, said substantial difference in reflectivity of said two adjacent features causing said developed photoresist material to reveal one adjacent feature but not the other.