Planar binar lense parameters optimisation for visible light

A modeling of the focusing of linear-polarized light by a binar cylindrical lens, analog of gradient Mikaelian lens was carried out for a visible light with a wavelength of (lambda) = 0.532 nm. The refraction number of the lens is n = 1.56, which corresponds to electronic resist. The minimum focus spot diameter at the end side of the lens was calculated full width half maximum as 0.37 of the wavelength. Efficiency of the focusing is equal to 41%. Modeling was carried out in by FDTD-method in the commercial program FullWave, Rsof design group.