The investigation of focusing of cylindrically polarized beams with the variable height of optical elements using high-performance computer systems

The investigation of the change in the size of the focal spot when laser radiation with radial and circular polarizations passes through a diffractive axicon and an optical element matched to the circular Airy distribution is carried out. The height of the optical elements was varied from 0.5λ to 1.5λ. Near-field diffraction modeling is numerically investigated by the finite difference time domain method. The formation of a thin light tip was shown for both of the considered elements, including for the longitudinal component of the electric field with a laser beam width up to FWHM = 0.36λ.