Multiple Resonances Induced by Plasmonic Coupling between Gold Nanoparticle Trimers and Hexagonal Assembly of Gold-Coated Polystyrene Microspheres

Takako Uchida, Takayasu Yoshikawa, Mamoru Tamura, Takuya Iida, Kohei Imura

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    Optical properties of a gold nanoparticle trimer assembly coupled with gold-coated hexagonally close-packed polystyrene microspheres were investigated by linear and nonlinear spectroscopy. The observed reflection spectrum shows multiple peaks from the visible to near-infrared spectral regions. The spectroscopic properties were also examined by a finite-difference time-domain simulation. We found that the optical response of plasmons excited in the gold nanoparticle trimers was significantly modulated by strong coupling of the plasmons and the photonic mode induced in the gold-coated polystyrene assembly. Two-photon induced photoluminescence and Raman scattering from the sample were investigated, and both signals were significantly enhanced at the gold nanoparticle assembly. The simulations reveal that the electric fields can be enhanced site-selectively, not only at the interstitial sites in the nanoparticle assembly but also at the gaps between the particle and the gold film due to plasmonic interactions, by tuning the wavelength and are responsible for the strong optical responses.

    Original languageEnglish
    Pages (from-to)3652-3658
    Number of pages7
    JournalJournal of Physical Chemistry Letters
    Volume7
    Issue number18
    DOIs
    Publication statusPublished - 2016 Sep 15

    Fingerprint

    Polystyrenes
    trimers
    Microspheres
    Gold
    polystyrene
    assembly
    gold
    Nanoparticles
    nanoparticles
    Plasmons
    plasmons
    Photonics
    Raman scattering
    Photoluminescence
    interstitials
    Photons
    Optical properties
    simulation
    Tuning
    tuning

    ASJC Scopus subject areas

    • Materials Science(all)

    Cite this

    Multiple Resonances Induced by Plasmonic Coupling between Gold Nanoparticle Trimers and Hexagonal Assembly of Gold-Coated Polystyrene Microspheres. / Uchida, Takako; Yoshikawa, Takayasu; Tamura, Mamoru; Iida, Takuya; Imura, Kohei.

    In: Journal of Physical Chemistry Letters, Vol. 7, No. 18, 15.09.2016, p. 3652-3658.

    Research output: Contribution to journalArticle

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