Plasmonic modes on rounded hexahedral and octahedral nano-antennas

In this paper, the resonant spectrum of plasmonic, Drude-like, silver nano-antennas is presented. The central focus is the study of the radiation pattern of shapes, such as rounded cornered hexahedra and octahedra, under a full electrodynamic surface integral equation numerical scheme. Several aspects regarding their dipole, quadrupole, and higher order far-field distribution are revealed, giving special emphasis in their qualitative characteristics. Aspects of their resonant behavior, such as quadrupole mode “Huygens” nano-antennas or peculiarities related with their far field planes are further discussed, expanding our understanding on single plasmonic nano-antennas and their emerging functionalities.