A method for generating double-ring-shaped vector beams
Chen Huan1, Ling Xiao-Hui2, Chen Zhi-Hong1, Li Qian-Guang1, Lv Hao1, Yu Hua-Qing1, Yi Xu-Nong1, †,
       

The experimentally generated double-ring-shaped vector beams with polarization order m = 3 by a PBP element with q = 1.5. The first row shows the respective intensity distributions behind a polarizer (GLP2) at different polarization angles when the PBP element is placed at 0°. The second row shows the intensity cross-sections when the PBP element rotates +90°.