Two-photon imaging of localized optical fields in the vicinity of silver nanowires using a scanning near-field optical microscope

Kohei Imura, Young Chae Kim, Seongyong Kim, Dae Hong Jeong, Hiromi Okamoto

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    We report a near-field two-photon excitation imaging technique for silver nanostructures to visualize optical fields in the vicinity of nanostructures. We have found that the excitation image of an isolated wire shows an oscillating feature along the long axis of the wire. The period of the oscillation is in good agreement with that of plasmon wavefunctions resonant with the excitation light. The oscillation was thus attributed to the resonant plasmon wavefunction. We also found that bundles of wires exhibit more intense photoluminescence signals than do isolated wires, particularly at junctions between wire ends and the shafts of other wires, which was attributed to the amplified optical fields at the ends of nanowires or interstitial gaps between the wires. We discuss the mechanism of the photoluminescence from silver nanowires. The photoluminescence is most probably attributed to emission from the oxidized surface layer of the silver nanowires, which is enhanced in resonance with plasmons on the wires.

    Original languageEnglish
    Pages (from-to)5876-5881
    Number of pages6
    JournalPhysical Chemistry Chemical Physics
    Volume11
    Issue number28
    DOIs
    Publication statusPublished - 2009

    Fingerprint

    optical microscopes
    Silver
    Nanowires
    near fields
    Microscopes
    nanowires
    Photons
    silver
    wire
    Wire
    Scanning
    Imaging techniques
    scanning
    photons
    Photoluminescence
    Wave functions
    photoluminescence
    Nanostructures
    excitation
    oscillations

    ASJC Scopus subject areas

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

    Cite this

    Two-photon imaging of localized optical fields in the vicinity of silver nanowires using a scanning near-field optical microscope. / Imura, Kohei; Kim, Young Chae; Kim, Seongyong; Jeong, Dae Hong; Okamoto, Hiromi.

    In: Physical Chemistry Chemical Physics, Vol. 11, No. 28, 2009, p. 5876-5881.

    Research output: Contribution to journalArticle

    Imura, Kohei ; Kim, Young Chae ; Kim, Seongyong ; Jeong, Dae Hong ; Okamoto, Hiromi. / Two-photon imaging of localized optical fields in the vicinity of silver nanowires using a scanning near-field optical microscope. In: Physical Chemistry Chemical Physics. 2009 ; Vol. 11, No. 28. pp. 5876-5881.
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