Figure 3: Partial light scattering efficiencies by different spherical multipole modes excited inside different SRRs.
From: Split-ball resonator as a three-dimensional analogue of planar split-rings
(a,b) Scattering by a 3D gold cube with the gap on top. The cube dimentions are 200 × 200 × 200 nm3, the gap has the width of 50 nm and depth of 100 nm. The incoming plane wave is directed from top (a) and from the side facing the cut (b). (c,d) Scattering by a flat gold SRR standing upright. The SRR has dimensions of 200 × 200 × 20 nm3, the gap has the width of 50 nm and depth of 100 nm. The incoming plane wave is directed from top (c) and from the side facing the cut (d). All the electric and magnetic spherical multipole harmonics of the first and the second order are calculated and plotted in the figures. Only harmonics that have a noticable contribution are marked (a11-electric dipole, b10-magnetic dipole, a22 and a21-electric quadrupoles). In case m is not zero, alm in the plots stays for a sum of alm and al-m mode contributions.
