Patent Document ID: 20100053580
Application ID: 12492736
Patent Flag: 0

Claim One:
1. A computer readable medium containing computer-executable instructions which cause a computer to execute processing steps that calculate a light intensity distribution formed on an image plane of a projection optical system when illuminating a mask using an illumination optical system and projecting an image of a pattern of the mask onto a substrate through the projection optical system, the computer readable medium comprising: computer-executable instructions that determine whether to divide an effective light source into a plurality of areas, the effective light source being formed on a pupil plane of the projection optical system when the mask is not arranged on an object plane of the projection optical system; computer-executable instructions that divide the effective light source into the plurality of areas upon determining to divide the effective light source into the plurality of areas; computer-executable instructions that generate, for each of the plurality of areas, a plurality of shifted pupil functions by shifting a pupil function representing a pupil of the projection optical system in accordance with a position of each of divided point sources; computer-executable instructions that define, for each of the plurality of areas, a matrix including the plurality of pupil functions generated in the generating step; computer-executable instructions that calculate, for each of the plurality of areas, eigenvalues and eigenfunctions by performing singular value decomposition of the matrix defined in the defining step; computer-executable instructions that calculate, for each of the plurality of areas, the light intensity distribution formed on the image plane of the projection optical system based on a diffracted light distribution of light diffracted by the pattern of the mask and the eigenvalues and the eigenfunctions calculated in the step of calculating the eigenvalues and the eigenfunctions; and computer-executable instructions that composite the light intensity distributions of the plurality of areas which are calculated in the step of calculating the light intensity distributions.