Figure 3 | Scientific Reports

Figure 3

From: Quasi-perfect vortices generated by Pancharatnam-Berry phase metasurfaces for optical spanners and OAM communication

Figure 3

The radii of the Q-PV ring under different TCs and focal lengths. (a) The relationship between TC (l = 0, 5, 10, 15, 20) and r. The dots were fitted by straight-line fit method. The slopes of fitting lines with TCs of 1,5 and 10 are k(0), k(5) and k(10), respectively. (b) The relationship between f and r when l equals to 5, r0 equals to 5 μm.

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