Figure 5

The structure and simulation results of type 4 graphene plasmonic metasurface. (a) The top view of the metasurface, which shows that the metasurface is made up of \(21\times 21\) elements, and the dimensions \(w\) and \(l\) of each element are chosen to ensure a \({90}^{{\rm{o}}}\) reflected phase difference, and gradually increased along the \(x\) direction. (b) The reflected phases distributions, which demonstrate that \({\phi }_{{E}_{y}}(x)\) and \({\phi }_{{E}_{x}}(x)\) have a 90° reflected phase difference and gradually decreased along the \(+x\) direction. (c) The electric-field distributions of TM reflected waves deflected to the direction of (\({\varphi }_{{E}_{x}}\,=\,{0}^{{\rm{o}}}\),\({\theta }_{{E}_{x}}\,=\,{23.6}^{{\rm{o}}}\)). (d) The electric-field distributions of TE reflected waves deflected to the same direction of (\({\varphi }_{{E}_{y}}\,=\,{0}^{{\rm{o}}}\),\({\theta }_{{E}_{y}}\,=\,{23.6}^{{\rm{o}}}\)), whose reflected phase is 90° ahead. (e) Normalized far-field patterns of TM and TE reflected waves, in the XOZ plane.