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Opt Lett. 2009 Feb 1;34(3):307-9.

Optical nonlinearities of Au nanoparticles and Au/Ag coreshells.

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  • 1Department of Physics, Hampton University, Hampton, VA 23668, USA. jaetae.seo@hamptonu.edu

Abstract

Au nanoparticles exhibited both negative and positive nonlinear absorptions with ground-state plasmon bleaching and free-carrier absorption that could be origins of the saturable and reverse-saturable optical properties. Au/Ag coreshells displayed only positive nonlinear absorption and reverse-saturable optical properties as a function of excitation intensity at the edge of surface-plasmon resonance, which implies no ground-state plasmon bleaching and the existence of two-photon absorption.

PMID:
19183640
[PubMed - indexed for MEDLINE]
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