Static and Dynamic Near-Field Measurements of High-Order Plasmon Modes Induced in a Gold Triangular Nanoplate

Keisuke Imaeda, Seiju Hasegawa, Kohei Imura*

*この研究の対応する著者

研究成果: Article査読

12 被引用数 (Scopus)

抄録

Precise understanding of the spatiotemporal characteristics of plasmons is essential for the development of applications of plasmonic nanoparticles. In this study, we investigated the spatiotemporal properties of high-order plasmon modes induced in a gold triangular nanoplate by static and dynamic near-field measurements. The near-field transmission measurements revealed that in-plane and out-of-plane polarized plasmon modes were simultaneously excited and these modes spectroscopically and spatially overlapped. The superposition of these modes was visualized in the near-field two-photon excitation image of the nanoplate. We performed time-resolved autocorrelation measurements on the nanoplate and found that the correlation width was broader than the excitation pulse due to the plasmon dephasing process. From the correlation width map of the nanoplate, we experimentally demonstrated that the out-of-plane plasmon mode exhibits a longer dephasing time than the in-plane plasmon mode. These findings indicate that the out-of-plane mode is desirable for improving the performance of plasmons in various applications.

本文言語English
ページ(範囲)4075-4081
ページ数7
ジャーナルJournal of Physical Chemistry Letters
9
14
DOI
出版ステータスPublished - 2018 7 19

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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