title: Plasmonic enhancement of the two photon absorption cross section of an organic chromophore using polyelectrolyte-coated gold nanorods.
abstract: The effect of plasmonic enhancement on the two-photon absorption cross section of organic chromophores attached to polyelectrolyte-coated gold nanorods was investigated. The magnitudes of such enhancements were confirmed using single and two photon excitations of the chromophore molecules bound to polyelectrolyte-coated gold nanorods. By synthesizing two-, four-, six-, and eight-polyelectrolyte layer coated nanorods of a particular aspect ratio, the distance dependence of the evanescent electromagnetic field on molecular two-photon absorption was observed. Enhancements of 40-fold were observed for the chromophores nearest to the surface.
authors.affiliation: Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.
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: Rachel N
authors.initials: RN
authors.lastname: Swiger
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
mesh_terms: D000042:Absorption; D004573:Electrolytes / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry*; D017785:Photons; D011108:Polymers / Q000737:chemistry*; D020349:Surface Plasmon Resonance; D013499:Surface Properties
chemical_list: D004573:Electrolytes; D011108:Polymers; D006046:Gold