Two-Dimensional Optical Metasurfaces: From Plasmons to Dielectrics

Figure 6

(a) Eight groups of V-shaped focusing structures arranged in the radial direction of the circle, arranged along the azimuth direction with 0, π/4, π/2, 3π/4, π, 5π/4, 3π /2, and 7π/4 phase antennas and linear spacing π/4. (b) Vortex phase mode.

(a)

(b)