Plasmon-Enhanced Fluorescence near Single Gold Nanoplates Studied by Scanning Near-Field Two-Photon Excitation Microscopy

Seiju Hasegawa, Keisuke Imaeda, Kohei Imura*

*この研究の対応する著者

研究成果: Article査読

1 被引用数 (Scopus)

抄録

Plasmonic optical fields have been applied for surface-enhanced spectroscopy, chemical sensing, and bioimaging. Spatial distributions of optical fields are critical for optimizing their functionalities. In plasmon-enhanced fluorescence, both incoming and outgoing fields excited by the plasmon should contribute to the enhancement of the fluorescence. Spatial characteristics of plasmons are critical not only for the fundamental understanding of the plasmon but also for their practical applications. Here, we investigate the spatial characteristics of the excitation and relaxation processes near the gold nanoplate using time-resolved near-field two-photon microscopy. We reveal from near-field optical microscopy that the incident field is locally enhanced by the plasmon resonance effect and the lightning rod effect. Near-field time-resolved fluorescence imaging demonstrates that the fluorescence decay is accelerated entirely over the surface of the plate regardless of the spatial distribution of the incident field. These results provide deep insight into plasmonic optical fields and are of great importance for designing plasmon-based substrates for surface-enhanced spectroscopy and photochemical reactions.

本文言語English
ページ(範囲)21070-21076
ページ数7
ジャーナルJournal of Physical Chemistry C
125
38
DOI
出版ステータスPublished - 2021 9月 30

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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