Tight Focusing Properties of Radially Polarized Gaussian Beams with Pair of Vortices
C. A. P. Janet1, K. B. Rajesh2**, M. Udhayakumar2, Z. Jaroszewicz3, T. V. S. Pillai4
1Department of Physics, St. Xavier's Catholic College of Engineering, Nagercoil, India 2Department of Physics, Chikkanna Government Arts College, Tiruppur, India 3Department of Physical Optics, Institute of Applied Optics, Poland, and National Institute of Telecommunications, Warsaw, Poland 4Department of Physics, University College of Engineering, Nagercoil, India
Abstract：The tight focusing properties of a radially polarized Gaussian beam with a nested pair of vortices having a radial wave front distribution are investigated theoretically by the vector diffraction theory. The results show that the optical intensity in the focal region can be altered considerably by changing the location of the vortices nested in a radially polarized Gaussian beam. It is noted that focal evolution from one annular focal pattern to a highly confined focal spot in the transverse direction is observed corresponding to the change in the location of the optical vortices in the input plane. It is also observed that the generated focal hole or spot lead to a focal shift along the optical axis remarkably under proper radial phase modulation. Hence the proposed system may be applied to construct tunable optical traps for both high and low refractive index particles.
. [J]. 中国物理快报, 2016, 33(12): 124206-124206.
C. A. P. Janet, K. B. Rajesh, M. Udhayakumar, Z. Jaroszewicz, T. V. S. Pillai. Tight Focusing Properties of Radially Polarized Gaussian Beams with Pair of Vortices. Chin. Phys. Lett., 2016, 33(12): 124206-124206.
2016, Vol. 33 
