title: Off-Resonant Two-Photon Absorption Cross-Section Enhancement of an Organic Chromophore on Gold Nanorods.
abstract: Surface-plasmon-initiated interference effects of polyelectrolyte-coated gold nanorods on the two-photon absorption of an organic chromophore were investigated. With polyelectrolyte bearing gold nanorods of 2,4,6 and 8 layers, the role of the plasmonic fields as function of distance on such effects was examined. An unusual distance dependence was found: enhancements in the two-photon cross-section were at a minimum at an intermediate distance, then rose again at a further distance. The observed values of enhancement were compared to theoretical predictions using finite element analysis and showed good agreementdue to constructive and destructive interference effects.
authors.affiliation: Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801.
authors.forename: Sean T
authors.initials: ST
authors.lastname: Sivapalan
authors.forename: Jarrett H
authors.initials: JH
authors.lastname: Vella
authors.forename: Timothy K
authors.initials: TK
authors.lastname: Yang
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Dalton
authors.forename: Joy E
authors.initials: JE
authors.lastname: Haley
authors.forename: Thomas M
authors.initials: TM
authors.lastname: Cooper
authors.forename: Augustine M
authors.initials: AM
authors.lastname: Urbas
authors.forename: Loon-Seng
authors.initials: LS
authors.lastname: Tan
authors.forename: Catherine J
authors.initials: CJ
authors.lastname: Murphy
keywords: Plasmonics; two-photon absorption