Modeling the fine structure of focused optical field at diffraction on a hole with arbitrary shape

The method and program for modeling the fine structure of focused and plane wave at diffraction on a hole with arbitrary shape is developed. The method is based on a numerical solution using the Sommerfeld diffraction integral without Freshnel approximation. It makes this method suitable for an amplitude and phase distribution determination for holes with arbitrary shape at arbitrary distances from aperture, up to nanometers. The modeling results are compared with experimental study of the diffraction plane uniform wave and the spherical Gaussian wave on circular aperture for a corresponding Fresnel numbers. Close agreement between them is obtained, achieving higher accuracy then using of Fresnel method.