Figure 6

Examples of SPPs that are generated with 24 sectors electrode. The drawn SPPs have topological charges of 4, 8 and 12 respectively. Alternating helical wavefront components are coloured in blue and red colours.

Examples of SPPs that are generated with 24 sectors electrode. The drawn SPPs have topological charges of 4, 8 and 12 respectively. Alternating helical wavefront components are coloured in blue and red colours.