Patent ID: 8230369
Filing Date: 2012-07-24
Classification: G03F

Abstract:
1. A method of simulating an optical intensity distribution on a substrate when a mask pattern formed on a mask is transferred to the substrate through a projection optical system by irradiating an illumination light obliquely on a mask surface of the mask, the method comprising: setting a phase difference between a zero-order diffraction light and a first-order diffraction light determined according to a function of factors comprising a distance between the zero-order diffraction light and the first-order diffraction light on a pupil of the projection optical system, a thickness of a light-shielding portion formed on the mask, an angle defined by an optical axis direction of the illumination light and an incident direction on the mask, and a difference between a size of the mask pattern and a half cycle of the mask pattern when the mask pattern is a periodic pattern; and carrying out a simulation of the optical intensity distribution on the substrate according to the set phase difference.