Mode-specific directional emission from hybridized particle-on-a-film plasmons
Journal article, 2011

We investigate the electromagnetic interaction between a gold nanoparticle and a thin gold film on a glass substrate. The coupling between the particle plasmons and the surface plasmon polaritons of the film leads to the formation of two localized hybrid modes, one low-energy. film-like. plasmon and one high-energy plasmon dominated by the nanoparticle. We find that the two modes have completely different directional scattering patterns on the glass side of the film. The high-energy mode displays a characteristic dipole emission pattern while the low-energy mode sends out a substantial part of its radiation in directions parallel to the particle dipole moment. The relative strength of the two radiation patterns vary strongly with the distance between the particle and the film, as determined by the degree of particle-film hybridization.


Vladimir Miljkovic

Chalmers, Applied Physics, Bionanophotonics

Timur Shegai

Chalmers, Applied Physics, Bionanophotonics

Mikael Käll

Chalmers, Applied Physics, Bionanophotonics

Peter Johansson

Chalmers, Applied Physics, Bionanophotonics

Optics Express

1094-4087 (ISSN) 10944087 (eISSN)

Vol. 19 14 12856-12864

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering



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