title: Symmetry breaking in individual plasmonic nanoparticles.
abstract: 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.
authors.affiliation: Department of Chemistry, Laboratory for Nanophotonics, Rice University, Houston, TX 77005, USA.
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.forename: Yanpeng
authors.initials: Y
authors.lastname: Wu
authors.forename: Britt
authors.initials: B
authors.lastname: Lassiter
authors.forename: Colleen L
authors.initials: CL
authors.lastname: Nehl
authors.forename: Jason H
authors.initials: JH
authors.lastname: Hafner
authors.forename: Peter
authors.initials: P
authors.lastname: Nordlander
authors.forename: Naomi J
authors.initials: NJ
authors.lastname: Halas
mesh_terms: D055590:Electromagnetic Phenomena; D049329:Nanostructures; D013057:Spectrum Analysis