title: Surface plasmon resonance in gold ultrathin nanorods and nanowires.
abstract: We synthesized and measured optical extinction spectra of Au ultrathin (diameter: ∼1.6 nm) nanowires (UNWs) and nanorods (UNRs) with controlled lengths in the range 20-400 nm. The Au UNWs and UNRs exhibited a broad band in the IR region whose peak position was red-shifted with the length. Polarized extinction spectroscopy for the aligned Au UNWs indicated that the IR band is assigned to the longitudinal mode of the surface plasmon resonance.
authors.affiliation: Department of Chemistry, School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Takahata
authors.forename: Seiji
authors.initials: S
authors.lastname: Yamazoe
authors.forename: Kiichirou
authors.initials: K
authors.lastname: Koyasu
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Tsukuda