An Improved Sensitivity SPR Biosensor Using Multilayer Graphene

A graphene-based Surface Plasmon Resonance (SPR) biosensor is presented. Graphene layers added to a conventional gold thin film SPR biosensor leads to a drastic increase in sensitivity due to the increased biomolecule adsorption in the graphene layers. In comparison to conventional SPR sensors this produces a large change in the refractive index at the metal-dielectric interface. The reflection of light coupled into a SPR mode propagating along a thin Au-graphene layer surrounded by dielectric is calculated and compared to a conventional SPR sensor.