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

*この研究の対応する著者

研究成果: Article査読

15 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)3652-3658
ページ数7
ジャーナルJournal of Physical Chemistry Letters
7
18
DOI
出版ステータスPublished - 2016 9月 15

ASJC Scopus subject areas

  • 材料科学(全般)
  • 物理化学および理論化学

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