Fig. 1
From: Multifunctional graphene metasurface to generate and steer vortex waves
Illustration of graphene metasurface and cell configuration. a Schematic of a graphene metasurface, which can steering the incoming electromagnetic waves by anomalous reflection. b Configuration of a graphene cell, which consists of multi-layered substrate and a mounted graphene patch of size wx×wy. A static gate voltage is applied between the graphene patch and the silicon layer to control the chemical potential