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Evaluation of Graphene Thin Films by Surface Plasmon Resonance

We have proposed the application of the surface plasmon resonance method to the measurement of the optical response of graphene thin films. A surface plasmon is a coherent electron oscillation that is excited at the interface between two materials when p-polarized light is incident. We revealed that the excitation angle shifts by about 0.1° in the case of monolayer graphene compared with the bare Au surface as determined by calculation. We also identified angle shifts of the excitation conditions for surface plasmon experimentally when graphene thin films fabricated by filtration exist on the Au surface, corresponding to 5–8 layers of graphene, as determined by the calculation.