Figure 2
From: Generation of E-band metasurface-based vortex beam with reduced divergence angle
(a) 1D gradient phase sequence pattern using the eight different meta-atom unit structures indicated in Fig. 1(d). (b,c) Spiral phase patterns for OAM mode (b) l = 1 and (c) l = 2 generation. (d,e) Vortex beam with OAM mode (d) l = 1 (M1) and (e) l = 2 (M2) generation metasurfaces incorporating the 1D gradient and spiral phase patterns. (f,g) Far-field scattering patterns of the vortex beams with OAM modes (f) l = 1 and (g) l = 2 generated by the metasurface M1 and M2 structures, respectively.
