Patent ID: 7840057
Filing Date: 2010-11-23
Classification: G03F

Abstract:
1. A non-transitory computer readable medium embedded with a computer program of instructions executable by the computer to perform method steps for performing model-based optical proximity to correct for distortions on a photomask, correction said method steps comprising: providing a region of interest (ROI) having an interaction distance; locating at least one finite geometrical shape within said ROI; generating at least one cut line across at least one lateral edge of said at least one finite geometrical shape; and extending said ROI beyond its interaction distance based on a location of said at least one cut line across said at least one lateral edge of said at least one finite geometrical shape by determining whether said at least one cut line is selected from the group consisting of a horizontal cut line, a vertical cut line and a 45-degree cut line to correct for optical proximity; and correcting for any distortions on a photomask using said corrected optical proximity.