Figure 9.
The configuration of the proposed graphene-on-gold surface plasmon resonance biosensor based on generalized N-Layer model, where the gold film is deposited on top of a SF10 glass prism. A polychromatic light wave passes through the prism and is internally reflected on the prism-gold interface, creating an evanescent wave which penetrate the metal film (50 nm) and propagate along the x direction with propagation constant. The light propagation constant matches the surface plasmon polariton (SPP) propagation constant across the interface by controlling the incident angle θ. Plots of totally reflected intensity versus incident angle yield a peak, which is known as SPR angle. The graphene-on-gold surface plasmon resonance: prism | Au (50 nm) | graphene (L × 0.34 nm) | sensing medium, where L is the number of graphene layers, and Z0 = 100 nm is the thickness of the biomolecule layer. Adapted from [116].