Focusing of Radially Polarized Electromagnetic Waves by a Parabolic Mirror

It is well-known that a strong longitudinal electric field and small spot size are observed when radially polarized beams tightly focused using high numerical aperture parabolic mirror. The component can accelerate electrons along the propagation axis at intensities in focal region, which opens an application particle acceleration. In this paper, we present rigorous derivation of obtained polarized, monochromatic, flat-top beam by formulae were deduced from Stratton–Chu integral known vector diffraction theory. We examined influence focusing parameters on distribution both radial components. short wavelength regimes, excellent agreement was found with results Rayleigh–Sommerfeld formula. calculation method be adapted for various types electromagnetic pulses as well.