By near-field optics, we characterized the local optical properties of clusters of gold nanoparticles randomly distributed under a 50 nm-thick SiO 2 thin film. A local field enhancement is visible above isolated clusters. A few hundred nanometers away from them, we observed a polarization-dependent pattern with elliptical lobes oriented in the incident polarization direction. A simple simulation shows that the observed near-field images can be represented by the sum of the field of an oscillating dipole and the incident field. When the cluster density is larger, the measured near-field images show numerous bright and dark spots. The position of the bright spots does not necessarily coincide with the gold clusters showing the presence of coupling effects between them. © 2011 Elsevier B.V. All rights reserved.

Near-field optical characterization of interacting and non-interacting gold nanoparticles embedded in a silica thin film

PINEIDER, FRANCESCO;
2011-01-01

Abstract

By near-field optics, we characterized the local optical properties of clusters of gold nanoparticles randomly distributed under a 50 nm-thick SiO 2 thin film. A local field enhancement is visible above isolated clusters. A few hundred nanometers away from them, we observed a polarization-dependent pattern with elliptical lobes oriented in the incident polarization direction. A simple simulation shows that the observed near-field images can be represented by the sum of the field of an oscillating dipole and the incident field. When the cluster density is larger, the measured near-field images show numerous bright and dark spots. The position of the bright spots does not necessarily coincide with the gold clusters showing the presence of coupling effects between them. © 2011 Elsevier B.V. All rights reserved.
2011
Lalouat, Loic; Billot, Laurent; Aigouy, Lionel; Pineider, Francesco; De Julián Fernández, César; Labéguerie Egéa, Jessica; Mortier, Michel
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/776658
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