Fig. 6From: Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials(a)-(d) Corresponding normal-incidence absorption spectra of monolayer graphene with the thickness of the SiO2 spacer increased from 25 to 40 nm in steps of 5 nm. The diameters of the Ag nanodisks are d1 = 140 nm, d2 = 120 nm, d3 = 100 nm, d4 = 80 nm, and the other parameters are the same as those in Fig. 2Back to article page