Light Scattering in Gold Nanorings

Published

November 1, 2004

Author(s)

Javier Aizpurua, L A. Blanco, P Hanarp, D S. Sutherland, M Kall, Garnett W. Bryant, F J. de Abajo

Abstract

The optical response of gold nanoparticles of disk-like and ring-like shape is studied by analyzing their extinctioncross section in the visible and near infrared regions. A strong dependence of the excitation modes on the actual geometry of the nanoparticles is found for particle diameters of 120 nm. The nanorings exhibit pronounced extinction peaks at much larger wavelengths than the nanodisks. We present both experimental results and numerical calculations, which are in excellent agreement when the geometry is correctly described. Nanorings arealso shown to enhance the spontaneous emission at the resonance, where the emission is focused primarily alongthe ring axis.

Citation

Journal of Quantitative Spectroscopy and Radiative Transfer

Volume

89

Issue

No. 1-4

Pub Type

Journals

Keywords

electrodynamics, extinction cross section, light scattering, Maxwell equations, nanooptics, nanoparticles, nanorings, surface plasmons

Citation

Aizpurua, J. , Blanco, L. , Hanarp, P. , Sutherland, D. , Kall, M. , Bryant, G. and de Abajo, F. (2004), Light Scattering in Gold Nanorings, Journal of Quantitative Spectroscopy and Radiative Transfer (Accessed October 10, 2025)