title: Localized plasmon resonances of bimetallic AgAuAg nanorods.
abstract: We investigated the localized surface plasmon resonances of individual AgAuAg nanorods (NRs) using the dark-field spectro-microscopy technique. We find that the scattering spectra of such hetero-NRs show longitudinal resonance wavelengths that are nearly insensitive to the relative composition of Ag and Au. Instead, the resonance is mostly governed by the overall length of the nanorod. This shows that the plasmons oscillate along the entire length of the NR without the significant perturbation at the Ag-Au interfaces. The results demonstrate that the overall geometry as well as the composition determine the tunability of the hetero-metallic nanostructures, and provide an important design rule for the composition-tunable bimetallic plasmon structures.
authors.affiliation: Department of Chemistry, Korea University, Seoul 137-701, Korea.
authors.forename: Sung-Hyun
authors.initials: SH
authors.lastname: Ahn
authors.forename: Deok-Soo
authors.initials: DS
authors.lastname: Kim
authors.forename: Daeha
authors.initials: D
authors.lastname: Seo
authors.forename: Wonjun
authors.initials: W
authors.lastname: Choi
authors.forename: Gi-Ra
authors.initials: GR
authors.lastname: Yi
authors.forename: Hyunjoon
authors.initials: H
authors.lastname: Song
authors.forename: Q-Han
authors.initials: QH
authors.lastname: Park
authors.forename: Zee Hwan
authors.initials: ZH
authors.lastname: Kim