Patent ID: 8163448

Claim:
A storage medium storing a program for causing a computer to execute a method of determining a structure of an antireflection coating formed on a substrate as an exposure target of an exposure apparatus including an illumination optical system which illuminates an original with light from a light source and a projection optical system which projects a pattern of the original, the program causing the computer to execute steps of: calculating, an intensity distribution of light diffracted by the original illuminated by the illumination optical system, based on information of an effective light source formed on a pupil plane of the projection optical system when the original is not located on an object plane of the projection optical system, and information of an original pattern including a main pattern corresponding to a target pattern to be formed on the substrate and an assist pattern; extracting diffracted light having an intensity of not less than a threshold from the intensity distribution calculated in the calculating step; and determining the structure of the antireflection coating, formed on the substrate, such that a reflectance of the antireflection coating falls within a target range when an incident angle of the diffracted light, which has the intensity of not less than the threshold and is extracted in the extracting step, on the antireflection coating formed on the substrate is an input.