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Fig. 5 | Nanoscale Research Letters

Fig. 5

From: Multifunctional graphene metasurface to generate and steer vortex waves

Fig. 5

Illustration of combining two metasurfaces into one multifunctional metasurface. In the inset, the electromagnetic waves are impinging normally from upper space with refractive index ni. a Metasruface 1 (MS1) with phase discontinuity ϕ1(x) and b metasurface 2 (MS2) with phase discontinuity ϕ2(x) are combined into c the desired multifunctional metasurface (MSt) with phase discontinuity ϕt(x). θr1(x), θr2(x) and θrt(x) are the angles of anomalous reflection along the interfaces of the metasurfaces, respectively, and the relationship θrt(x)=θr1(x)+θr2(x) holds everywhere in MSt

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