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Figure 1

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

Figure 1

The metasurface design for generating Q-PV. (a) The schematic for generating Q-PV by PB phase metasurface. (b) The enlarged local part of the PB phase metasurface. (c) The structure of each nano-elliptic unit in one period. (d) The distribution of the transmission efficiency and the phase delay in the case of the angle between the long axis of the nanopost and the positive half-axis of the x-axis are 0 to 180 (degree).

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