Off-Resonant Optical Excitation of Gold Nanorods: Nanoscale Imprint of Polarization Surface Charge Distribution

Claire Deeb (1) , Xuan Zhou (1) , Davy Gérard (1) , Alexandre Bouhelier (2) , K. Jain Prashant (3) , Jérôme Plain (1) , Olivier Soppera (4) , Pascal Royer (1) , Renaud Bachelot (1)

1 LNIO - Laboratoire de Nanotechnologie et d'Instrumentation Optique
2 ICB - Laboratoire Interdisciplinaire Carnot de Bourgogne
3 UC - University of California
4 IS2M - Institut de Science des Matériaux de Mulhouse

We report on the nanoscale optical characterization of gold nanorods irradiated out of their plasmonic resonance. Our approach is based on the reticulation of a photopolymerizable formulation locally triggered by enhanced electromagnetic fields. The tiny local field enhancement stems from the surface polarization charges associated with the electric field discontinuity at the metal/dielectric interface. This allows us to get a nanoscale signature of the spatial distribution of the surface charge density in metallic nanoparticles irradiated off-resonance.

Mots clés: optical properties of metal nanoparticles; surface charge density; polymerization; plasmonics; polymer cross-linking; nanorods

Domaines: Polymères; Matériaux

Claire Deeb, Xuan Zhou, Davy Gérard, Alexandre Bouhelier, K. Jain Prashant, et al.. Off-Resonant Optical Excitation of Gold Nanorods: Nanoscale Imprint of Polarization Surface Charge Distribution. Journal of Physical Chemistry Letters, 2011, 2 (1), pp.7-11. ⟨10.1021/jz1014696⟩. ⟨hal-00622602⟩