title: Raman and near-field spectroscopic study on localized surface plasmon excitation from the 2D nanostructure of gold nanoparticles.
abstract: We have studied electromagnetic field on the surface of two-dimensional nanostructure of gold nanoparticles through two-photon-induced photoluminescence images by using scanning near-field optical microscope and far-field surface-enhanced Raman scattering measurements. The near-field two-photon-induced photoluminescence image shows that strong inhomogeneous enhancement in two-photon-induced photoluminescence occurs over the two-dimensional nanostructure, representing localized surface plasmon excitations. The results suggest that the local structure of the two-dimensional nanostructure influences the distribution of localized surface plasmon excitation.
authors.affiliation: Institute of Applied Physics, University for Tsukuba, Tsukuba, Ibaraki 305-0005, Japan.
authors.forename: M K
authors.initials: MK
authors.lastname: Hossain
authors.forename: T
authors.initials: T
authors.lastname: Shimada
authors.forename: M
authors.initials: M
authors.lastname: Kitajima
authors.forename: K
authors.initials: K
authors.lastname: Imura
authors.forename: H
authors.initials: H
authors.lastname: Okamoto