Generation of Sub Wavelength Focal Hole Segment using Azimuthally Polarized Higher Order Beam by High NA Parabolic Mirror

The focusing properties of a tight focusing of higher order azimuthally polarized beam through a high numerical aperture parabolic mirror are numerically investigatedbased on vector diffraction theory. It shows that the three-dimensional intensity distributions in the vicinity of the focus is dependent on the polarization rotation angle, pupil to beam radio and numerical aperture value.Additionally, somegenerated focal segment is a splitted holes and focal hole increase in the axial direction. Such a focal hole segment is highly useful for trapping particles, laser cutting, microscopy and the manipulation of optical traps of low refractive index particles.