Quasinormal Mode Analysis of Polygon-on-Mirror Geometries

Plasmonic nanoantennas offer intense confinement of light, to volumes even below the diffraction limit. Routine scattering analysis offers limited information on near-field intricacies. Therefore, we adopt a quasinormal mode approach to reveal the strong facet morphology dependence of rhombicuboctahedron-on-mirror near-field charge distributions, as well as far-field out-coupling. Thus allows for structural identification from far-field measurements.