title: Impurity-induced plasmon damping in individual cobalt-doped hollow Au nanoshells.
abstract: The optical properties of plasmonic nanoparticles in the size range corresponding to the electrostatic, or dipole, limit have the potential to reveal effects otherwise masked by phase retardation. Here we examine the optical properties of individual, sub-50 nm hollow Au nanoshells (Co-HGNS), where Co is the initial sacrificial core nanoparticle, using single particle total internal reflection scattering (TIRS) spectroscopy. The residual Co present in the metallic shell induces a substantial broadening of the homogeneous plasmon resonance line width of the Co-HGNS, where the full width at half-maximum (fwhm) broadens proportionately with increasing Co content. This doping-induced line broadening provides a strategy for controlling plasmon line width independent of nanoparticle size, and has the potential to substantially modify the relative decay channels for localized nanoparticle surface plasmons.
authors.affiliation: Department of Electrical and Computer Engineering, ‡Applied Physics Graduate Program, §Department of Chemistry, ∥Department of Physics and Astronomy, ⊥Rice Quantum Institute, and #the Laboratory for Nanophotonics, Rice University , MS-378, 6100 Main Street, Houston, Texas 77005, United States.
authors.forename: Christyn A
authors.initials: CA
authors.lastname: Thibodeaux
authors.forename: Vikram
authors.initials: V
authors.lastname: Kulkarni
authors.forename: Wei-Shun
authors.initials: WS
authors.lastname: Chang
authors.forename: Oara
authors.initials: O
authors.lastname: Neumann
authors.forename: Yang
authors.initials: Y
authors.lastname: Cao
authors.forename: Bruce
authors.initials: B
authors.lastname: Brinson
authors.forename: Ciceron
authors.initials: C
authors.lastname: Ayala-Orozco
authors.forename: Chih-Wei
authors.initials: CW
authors.lastname: Chen
authors.forename: Emilia
authors.initials: E
authors.lastname: Morosan
authors.forename: Stephan
authors.initials: S
authors.lastname: Link
authors.forename: Peter
authors.initials: P
authors.lastname: Nordlander
authors.forename: Naomi J
authors.initials: NJ
authors.lastname: Halas