Fig. 2

Surface charge redistribution in nanoparticle/graphene hybrid system. Surface charge distributions of R = 50 nm Ag nanoparticle dimer on monolayer graphene with 1-nm gap a at 633 nm and c at 3000 nm. Surface charge distributions in graphene surface of R = 50 nm Ag nanoparticle dimer on monolayer graphene with 1-nm gap b at 633 nm and d at 3000 nm. The deduced charge dipole interaction representation at 633 and 3000 nm is shown on the right of Fig. 2