Mode-specific directional emission from hybridized particle-on-a-film plasmons
Artikel i vetenskaplig tidskrift, 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.

Författare

Vladimir Miljkovic

Chalmers, Teknisk fysik, Bionanofotonik

Timur Shegai

Chalmers, Teknisk fysik, Bionanofotonik

Mikael Käll

Chalmers, Teknisk fysik, Bionanofotonik

Peter Johansson

Chalmers, Teknisk fysik, Bionanofotonik

Optics Express

1094-4087 (ISSN)

Vol. 19 14 12856-12864

Ämneskategorier

Elektroteknik och elektronik

DOI

10.1364/OE.19.012856