Doped graphene layers have also shown the similar surface plasmon effects to that of metallic thin films.
[7][8] Through the engineering of metallic substrates or nanoparticles (e.g., gold, silver and copper) with graphene, the plasmonic properties of the hybrid structures could be tuned for improving the optoelectronic device performances.
[12] When the plasmons were resonant at the graphene/metal surface, a strong electric field would be induced which could enhance the generation of electron-hole pairs in the graphene layer.
[13][14] The excited electron carrier numbers linearly increased with the field intensity based on the Fermi’s rule.
The induced charge carriers of metal/graphene hybrid nanostructure could be up to 7 times higher than that of pristine graphene ones due to the plasmonic enhancement.