Figure 3.
(a) Characteristic extinction cross section of a nanodisk (60 nm in diameter and Fermi energy EF = 0.4 eV), dominated by a pronounced dipolar plasmon and strong near-field enhancement. Solid curve: Full electrodynamic calculation. Dashed curve: Fit to a Lorentzian polarizability. Inset: Near-field intensity normalized to incident intensity for plane-wave illumination with polarization parallel to the disk. (b) Normal-incidence absorbance by graphene disk arrays supported on a dielectric-coated gold surface (see the inset) for various values of the dielectric film thickness. Reproduced from reference [87], with permission from American Physical Society, 2012.