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. 2019 Jan 9;8:3. doi: 10.1038/s41377-018-0113-y

Fig. 5. Characterization of the second meta-multiplexer with versatile vortices via illuminating the plate with spin-up and spin-down plane waves.

Fig. 5

a Illustration of how to obtain the composite phase profiles via merging three types of phases. b A magnified view of the fabricated sample. Normalized FDTD-calculated and experimentally measured far-field c 3D and d 2D scattering patterns along φ = 45° at 9.5 and 10.5 GHz. e Measured near-field Ey distributions at 9.5 and 10.5 GHz, including Mag(Ey) at z = 250 mm (8.75 λ) above the meta-multiplexer (left and right panels) and Real(Ey) information on a cross-section that is vertical to one Bessel beam (middle inset). f The FDTD-simulated Phase(Ey) at 10.5 GHz for a meta-multiplexer that is carrying OAM modes of l = 1 and l = 2. The element phase in each supercell has 0, 0, 0, 0, π, π, π, and π along the x-direction and 0, π/4, π/2, 3π/4, π, 5π/4, 3π/2, and 7π/4 along the y-direction