Visualizing the optical field structures in metal nanostructures

Hiromi Okamoto, Kohei Imura

    Research output: Contribution to journalArticle

    31 Citations (Scopus)

    Abstract

    Noble metal nanostructures yield confined optical fields on a nanometer scale due to plasmon resonances, and they have potentially novel applications in spectroscopic analysis, photochemical reactions, optical devices, bioimaging, and so forth. To design nanoscale confined optical fields for use in specific applications, visualization of the fields is needed to provide essential information. We adopted near-field optical microscopy to visualize the optical fields in the present study. Examples of the direct visualization of optical fields in metal nanostructures are presented together with the analysis of the unique spectroscopic characteristics based on near-field imaging. For single nanoparticles such as gold nanorods, the plasmon standing wave functions and/or enhanced local fields near the particles were visualized depending on the particle shapes and sizes. In the assembled nanoparticles, the enhanced optical fields at the gap sites between the particles were visualized, thus elucidating the mechanism of surface-enhanced Raman scattering. The characteristic optical fields for various other metal nanostructures are also discussed.

    Original languageEnglish
    Pages (from-to)2230-2241
    Number of pages12
    JournalJournal of Physical Chemistry Letters
    Volume4
    Issue number13
    DOIs
    Publication statusPublished - 2013 Jul 3

    Fingerprint

    Nanostructures
    near fields
    Metals
    Visualization
    metals
    Nanoparticles
    nanoparticles
    Spectroscopic analysis
    Photochemical reactions
    spectroscopic analysis
    Precious metals
    Wave functions
    Optical devices
    noble metals
    Nanorods
    standing waves
    Gold
    photochemical reactions
    nanorods
    Optical microscopy

    ASJC Scopus subject areas

    • Materials Science(all)

    Cite this

    Visualizing the optical field structures in metal nanostructures. / Okamoto, Hiromi; Imura, Kohei.

    In: Journal of Physical Chemistry Letters, Vol. 4, No. 13, 03.07.2013, p. 2230-2241.

    Research output: Contribution to journalArticle

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