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High spatial resolution mapping of surface plasmon resonance modes in single and aggregated gold nanoparticles assembled on DNA strands

Carlos Diaz-Egea1*, Wilfried Sigle2, Peter A van Aken2 and Sergio I Molina1

Author Affiliations

1 Instituto de Microscopía Electrónica y Materiales, Departamento de Ciencia de los Materiales e I. M. y Q. I, Facultad de Ciencias, Universidad de Cádiz, Campus Río San Pedro, s/n, 11510, Puerto Real Cádiz, Spain

2 Max Planck Institute for Intelligent Systems, Stuttgart Center for Electron Microscopy, Heisenbergstraße 3, Stuttgart 70569, Germany

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Nanoscale Research Letters 2013, 8:337  doi:10.1186/1556-276X-8-337

Published: 26 July 2013

Abstract

We present the mapping of the full plasmonic mode spectrum for single and aggregated gold nanoparticles linked through DNA strands to a silicon nitride substrate. A comprehensive analysis of the electron energy loss spectroscopy images maps was performed on nanoparticles standing alone, dimers, and clusters of nanoparticles. The experimental results were confirmed by numerical calculations using the Mie theory and Gans-Mie theory for solving Maxwell's equations. Both bright and dark surface plasmon modes have been unveiled.

78.67.Bf; 61.46.Df; 87.64.Ee

Keywords:
Plasmonics; Surface plasmon resonance; Gold nanoparticles; Electron energy loss spectroscopy; DNA; Assembly