Coupling modes of gold trimer superstructures

Coupling modes of gold trimer superstructures

AM Funston, TJ Davis, C Novo, P Mulvaney

An experimental and theoretical examination of the coupling modes within superstructures of gold nanorod trimers is presented. The experimentally determined spectrum of the nanorod trimers is reported and the modes are elucidated using an electrostatic eigenmode method based on the coupling of evanescent electric fields. The theory is able to reproduce the experimental spectrum well, and the nature of the modes and interactions are discussed.