Distinct Plasmonic Manifestation on Gold Nanorods Induced by the Spatial Perturbation of Small Gold Nanospheres

The plasmon coupling between a Au nanorod and a small Au nanosphere has been studied with scattering measurements, electrodynamic simulations, and model analysis. The spatial perturbation of the nanosphere leads to distinct spectral changes of the heterodimer. The plasmonic responses, including Fano...

Full description

Saved in:
Bibliographic Details
Published in:Nano letters 2012-03, Vol.12 (3), p.1424-1430
Main Authors: Shao, Lei, Fang, Caihong, Chen, Huanjun, Man, Yat Cho, Wang, Jianfang, Lin, Hai-Qing
Format: Article
Language:English
Subjects:
Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
Computer Simulation
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Dipoles
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Exact sciences and technology
Gold
Gold - chemistry
Light
Materials science
Models, Chemical
Nanocrystalline materials
Nanorods
Nanoscale materials and structures: fabrication and characterization
Nanospheres
Nanospheres - chemistry
Nanospheres - ultrastructure
Nanostructure
Nanotubes
Perturbation methods
Physics
Plasmonics
Plasmons
Scattering, Radiation
Surface and interface electron states
Surface Plasmon Resonance - methods
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The plasmon coupling between a Au nanorod and a small Au nanosphere has been studied with scattering measurements, electrodynamic simulations, and model analysis. The spatial perturbation of the nanosphere leads to distinct spectral changes of the heterodimer. The plasmonic responses, including Fano resonance, are remarkably sensitive to the nanosphere position on the nanorod, the gap distance, and the nanocrystal dimensions. The nanosphere dipole is intriguingly found to rotate around the nanorod dipole to achieve favorable attractive interaction for the bonding dipole–dipole mode. The sensitive spectral response of the heterodimer to the spatial perturbation of the nanosphere offers an approach to designing plasmon rulers of two spatial coordinates for sensing and high-resolution measurements of distance changes.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl2041063