Fig. 1. Schematic of waveguide structure

Fig. 2. Normalized energy distribution of fundamental mode. (a) Normalized energy distribution; (b) |S_z| along y direction

Fig. 3. Graphene plasmon modal properties with respect to frequency. (a) Re(n_eff) and L_P; (b) A_eff/A₀ and F_M. Here, we set μ_c=0.5 eV, T=300 K, τ=0.5 ps, R=30 nm, ε₁=3, ε₂=1, W= 200 nm, H=100 nm, and D=20 nm

Fig. 4. Modal transmission properties with respect to R and D. (a) Re(n_eff) and L_P versus R when D=20 nm; (b) A_eff/A₀ and F_M versus R when D=20 nm; (c) Re(n_eff) and L_P versus D when R= 30 nm; (d) A_eff/A₀ and F_M versus D when R= 30 nm

Fig. 5. Modal transmission properties with respect to nanowire permittivity and chemical potential of graphene. (a) Re(n_eff) and L_P as functions of ε₁ when μ_c=0.5 eV; (b) A_eff/A₀ and F_M as functions of ε₁ when μ_c=0.5 eV; (c) Re(n_eff) and L_P as functions of μ_c when ε₁=2; (d)