Finding optimal masks for simulation of tight focusing of laser beams with inhomogeneous polarization

The paper is dedicated to the study of tight focusing of laser beams with radial polarization and finding the optimal configuration of a binary phase mask to obtain the minimum size of the focal spot according to the full-width at half-maximum of intensity in the focus of an aplanatic lens. The simulation was implemented by the Richards-Wolf formulas for radially polarized light. Optimization of the binary phase mask was implemented by genetic algorithm.