Vol. 48, Issue 3, pp. 389-398

Vol. 48 Issue 3 pp. 389-398

Tight focusing of radially polarized beams by a devil’s vortex lens

Ziyang Chen, Xiansheng Hu, Xudong Chen, Xiaoyan Wang, Jixiong Pu

Keywords

devil’s vortex lens, radially polarized beam, tight focusing, high numerical aperture

Abstract

Tight focusing of radially polarized beams with a devil’s vortex lens is numerically investigated. Multiple focal spots can be generated in the geometric focus when a radially polarized beam is focused by a high numerical aperture objective in the presence of a devil’s vortex lens. The position of the major focal spot shifts from the geometric focus when a devil’s vortex lens with S = 1 is employed, and the position of the focal spot can be controlled by the numerical aperture of the objective. The intensity components of the major focal spot are influenced by the vortex phase of the devil’s vortex lens. A strong longitudinal component near the optical axis is produced by a devil’s vortex lens without vortex phase, and a nearly pure transversal field is produced by a devil’s vortex lens with vortex phase.

Vol. 48
Issue 3
Article No: 05
pp. 389-398

9.2 MB
OPTICA APPLICATA - a quarterly of the Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology