Patent ID: 6767682
Filing Date: 2004-07-27
Classification: G03F

Abstract:
A method of forming a quadratic hole on a surface comprising:coating the surface with a photoresist layer; exposing the photoresist layer to a light source, the light source having passed through a photomask, wherein the photomask comprises a first window corresponding to the desired quadratic feature, whereby light from the light source passing through the first window exposes a first portion of the desired quadratic feature on the surface; and a plurality of adjacent windows, whereby light passing through the adjacent windows forms diffraction patterns, which diffraction patterns constructively interfere to expose a second portion of the desired quadratic feature on the surface; selectively dissolving the photoresist layer to remove exposed portions of the photoresist layer; and etching the surface underlying the portions of the photoresist layer that were removed to form quadratic holes.