Patent ID: 7251806
Filing Date: 2007-07-31
Classification: G03F

Abstract:
1. A method of generating an interpreted pattern of a mask layout feature, the mask layout including edges dissected into a plurality of segments, each segment having an evaluation point, the method comprising: identifying a two-dimensional segment; measuring an aerial image gradient at the evaluation point of the two-dimensional segment; determining a normal target shift for the two-dimensional segment based on the aerial image gradient at the evaluation point, wherein determining the normal target shift for the two-dimensional segment includes determining a measured aerial image magnitude and at least one of a measured angle of the aerial image gradient, a plurality of empirically-derived fit constants, a base angle where no shift is applied, and a base magnitude where no shift is applied; modifying a target position of the segment using the normal target shift; and saving the modified target position as part of the interpreted pattern, wherein the modified target position provides a more realistic optical proximity correction target.