Fig. 3: Asymmetric meta-hologram with different polarization designs. | Nature Communications

Fig. 3: Asymmetric meta-hologram with different polarization designs.

From: Creating pairs of exceptional points for arbitrary polarization control: asymmetric vectorial wavefront modulation

Fig. 3

Simulation results of the CP conversion efficiency and relative PB phase of the metasurfaces when the meta-structures of (a) \(S\) and (b) \({S}^{m}\) rotate at different angles. c–g Fabricated and measured results of the asymmetric meta-holograms. The polarizations of the holograms were designed as c LCP (χ = −45°), d RCP (χ = 45°), e LP-45° (\(\psi\) = 45°, χ = 0°) and f ELP (\(\psi\) = 0°, χ = 18.43°). Asymmetric holographic images can be seen with clear images of “L”, “R”, “A” and “H” at 30° but only faint and incomplete images appear at the opposite angle of −30°. g The corresponding polarization of the holographic images on Poincaré sphere. Blue dots: designed polarizations. Red dots: experimentally measured polarizations.

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