Figure 1

(a) Schematic of a graphene-wrapped solid silver nanosphere. (b) Graphene absorption efficiencies as a function of the radius of the silver nanosphere calculated at four different wavelengths of λ = 455 nm (black), λ = 610 nm (red), λ = 875 nm (blue) and λ = 1195 nm (green). For clarity, the graphene absorption efficiencies at the wavelengths of λ = 610 nm, λ = 875 nm and λ = 1195 nm are amplified 4, 10 and 10 times, respectively. For each wavelength, a dashed vertical line indicates a particular silver core radius with which the graphene absorption efficiency can achieve the maximum value.