Figure 2. Numerical results of fundamental SPPs mode for the monolayer structure.

(a) The dispersion curves of fundamental mode (m = 0). The inset is Fourier spectra of radiation intensity from the structure with and without graphene. (b) The contour map of electric field E_z in Y-Z plane of excited SPPs at point A. (c,d) The contour maps of electric field E_z in Y-Z and X-Y planes of excited SPPs at point B. The radiation frequency vs. the chemical potential and beam velocity for the structure with radii r_a = 3 μm (e) and r_a = 0.5 μm (f), respectively.