Role of surface plasmon polaritons and other waves in the radiation of resonant optical dipole antennas.

ABSTRACT: The radiation of an electric dipole emitter can be drastically enhanced if the emitter is placed in the nano-gap of a metallic dipole antenna. By assuming that only surface plasmon polaritons (SPPs) are excited on the antenna, we build up an intuitive pure-SPP model that is able to comprehensively predict the electromagnetic features of the antenna radiation, such as the total or radiative emission rate and the far-field radiation pattern. With the model we can distinguish the respective contributions from SPPs and from other surface waves to the antenna radiation. It is found that for antennas with long arms that support higher-order resonances, SPPs provide a dominant contribution to the antenna radiation, while for other cases, the contribution of surface waves other than SPPs should be

SUBMITTER: Jia H 

PROVIDER: S-EPMC4326694 | biostudies-literature | 2015 Feb

REPOSITORIES: biostudies-literature