Generation of Multiple Focal Hole Segments Using Double-Ring Shaped Azimuthally Polarized Beam
Figure 2
(Colour online) shows the contour plot of the total intensity distribution in the plane near the focus for the focusing system with 3 belts BPF. (a) Single-ring focus, (b) double-ring focus, (c) double-ring focus with large separation of axial distance, and (d) triple-ring focus.
