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Proc Natl Acad Sci U S A. 2006 Jul 18;103(29):10856-60. Epub 2006 Jul 7.

Symmetry breaking in individual plasmonic nanoparticles.

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  • 1Department of Chemistry, Laboratory for Nanophotonics, Rice University, Houston, TX 77005, USA.


The plasmon resonances of a concentric metallic nanoshell arise from the hybridization of primitive plasmon modes of the same angular momentum on its inner and outer surfaces. For a nanoshell with an offset core, the reduction in symmetry relaxes these selection rules, allowing for an admixture of dipolar components in all plasmon modes of the particle. This metallodielectric nanostructure with reduced symmetry exhibits a core offset-dependent multipeaked spectrum, seen in single-particle spectroscopic measurements, and exhibits significantly larger local-field enhancements on its external surface than the equivalent concentric spherical nanostructure.

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