Bright and dark plasmon resonance of Ag nanorod dimers

Abstract

In this paper, plasmon resonances arising from the interaction between two closely spaced nanoparticles have been investigated by the finite difference time domain method. We report that the plane wave directly excites the bright mode and dark mode in the symmetric Ag nanorod dimers. We study the spectral properties of plasmonic nanorod systems by selectively tailoring the nanorod geometry parameters and interparticle gap distance. We also study the modulation of the geometry parameters and gap distances of nanorods on the charge density and electric field distributions of both the resonance modes. We believe that unlocking these properties will inspire further exciting developments in quantum mechanical effects and sub-nanometer scale photonics.