Fig. 1. Structures of SQWPs: (a) 1/2-order SQWP and (b) first-order SQWP.

Fig. 2. Schematic diagram of the generation of a first-order PVB by a first-order SQWP.

Fig. 3. Simulation results of generating different-order PVBs by SQWPs with sectors of 8, 12, and 16.

Fig. 4. Simulation results of LG mode beam transformed by 1/2-order and first-order SQWPs. Those numbers labeled near the separated beams represent their topological charges.

Fig. 5. Experimental setup to study the transformation of LG beams by SQWPs. PBS: polarizing beam splitter, BE: beam expander, WP: Wollaston prism, L: lens.

Fig. 6. Experiment results of first-order SQWP with sectors of 12.

Fig. 7. Experimental results of LG mode beams transformed by the first-order SQWP. (a) The patterns of the transformed beams and the separated beams where the numbers labeled in (a) indicate the topological charges of those beams. (b) The measurement results of the topological charges of the separated beams where the numbers labeled in (b) indicate the diffractive orders of the computer-generated hologram.