Strong optical coupling between mutually orthogonal plasmon oscillations in a silver nanosphere-nanowire joined system

Seongyong Kim, Kohei Imura, Minwoo Lee, Tetsuya Narushima, Hiromi Okamoto, Dae Hong Jeong

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    A top-to-bottom joined system consisting of a silver nanowire and nanospheres was fabricated by embedding silver nanospheres on a glass or silicon substrate on which 3-aminothiophenol as an analyte molecule was adsorbed, and then placing silver nanowires on the substrate to make gap sites between a nanowire and nanospheres. In the far-field Raman measurements, the sphere under the wire exhibited more than 60 times higher Raman enhancement than isolated spheres. The surface enhanced Raman scattering (SERS) spectra obtained by the 647.1 nm excitation showed highly polarized feature, exhibiting ca. 4 times higher SERS intensity for the electric field parallel to the wire axis than that perpendicular to the wire axis while those by the 514.5 nm excitation showed non-polarized feature against the incident electric field direction. The polarized feature by the 647.1 nm excitation is explained in terms of optical coupling in a vertical direction to the substrate plane, between the silver nanosphere and the longitudinal surface plasmon mode of the nanowire. The longitudinal plasmon of the nanowire functions as an antenna of the incident radiation field in this type of coupled plasmon mode, to yield the confined field. Near-field two-photon excitation imaging measurements as well as numerical calculations of the localized electric field around the system support this idea and indicate that the coupling between the surface plasmon of silver nanospheres and the longitudinal mode of silver nanowires is site-selective.

    Original languageEnglish
    Pages (from-to)4146-4153
    Number of pages8
    JournalPhysical Chemistry Chemical Physics
    Volume15
    Issue number12
    DOIs
    Publication statusPublished - 2013 Mar 28

    Fingerprint

    optical coupling
    Nanospheres
    Silver
    Nanowires
    nanowires
    silver
    oscillations
    Electric fields
    wire
    Wire
    excitation
    electric fields
    Raman scattering
    Substrates
    Raman spectra
    support systems
    incident radiation
    Silicon
    radiation distribution
    embedding

    ASJC Scopus subject areas

    • Physical and Theoretical Chemistry
    • Physics and Astronomy(all)

    Cite this

    Strong optical coupling between mutually orthogonal plasmon oscillations in a silver nanosphere-nanowire joined system. / Kim, Seongyong; Imura, Kohei; Lee, Minwoo; Narushima, Tetsuya; Okamoto, Hiromi; Jeong, Dae Hong.

    In: Physical Chemistry Chemical Physics, Vol. 15, No. 12, 28.03.2013, p. 4146-4153.

    Research output: Contribution to journalArticle

    Kim, Seongyong ; Imura, Kohei ; Lee, Minwoo ; Narushima, Tetsuya ; Okamoto, Hiromi ; Jeong, Dae Hong. / Strong optical coupling between mutually orthogonal plasmon oscillations in a silver nanosphere-nanowire joined system. In: Physical Chemistry Chemical Physics. 2013 ; Vol. 15, No. 12. pp. 4146-4153.
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    abstract = "A top-to-bottom joined system consisting of a silver nanowire and nanospheres was fabricated by embedding silver nanospheres on a glass or silicon substrate on which 3-aminothiophenol as an analyte molecule was adsorbed, and then placing silver nanowires on the substrate to make gap sites between a nanowire and nanospheres. In the far-field Raman measurements, the sphere under the wire exhibited more than 60 times higher Raman enhancement than isolated spheres. The surface enhanced Raman scattering (SERS) spectra obtained by the 647.1 nm excitation showed highly polarized feature, exhibiting ca. 4 times higher SERS intensity for the electric field parallel to the wire axis than that perpendicular to the wire axis while those by the 514.5 nm excitation showed non-polarized feature against the incident electric field direction. The polarized feature by the 647.1 nm excitation is explained in terms of optical coupling in a vertical direction to the substrate plane, between the silver nanosphere and the longitudinal surface plasmon mode of the nanowire. The longitudinal plasmon of the nanowire functions as an antenna of the incident radiation field in this type of coupled plasmon mode, to yield the confined field. Near-field two-photon excitation imaging measurements as well as numerical calculations of the localized electric field around the system support this idea and indicate that the coupling between the surface plasmon of silver nanospheres and the longitudinal mode of silver nanowires is site-selective.",
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