Focusing Properties of Double Ring Shaped Cylindrical Vector Beam by High NA Parabolic Mirror
J. Environ. Nanotechnol., Volume 3, No (Special Issue) (August 2014) pp. 15-20
Abstract
The tight focusing properties of double ring shaped cylindrical vector beam focused with a high numerical aperture (NA) parabolic mirror is investigated theoretically by 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, some interesting focal volume structures, such as adjustably confined flat-topped focus, focal spot, and doughnut focal hole can be obtained by controlling polarization rotator angle. The tightly focused double ring shaped cylindrical vector beam by a high numerical aperture parabolic mirror have possible applications in particle acceleration, optical trapping and manipulating, single molecule imaging and high resolution imaging microscopy.
