Spatial distribution of enhanced optical fields in monolayered assemblies of metal nanoparticles: Effects of interparticle coupling

Hiromi Okamoto*, Kohei Imura, Toru Shimada, Masahiro Kitajima

*この研究の対応する著者

研究成果査読

10 被引用数 (Scopus)

抄録

Near-field two-photon excitation images of assemblies of many gold nanospheres show characteristic feature that enhanced optical fields are confined at the rim parts of the assemblies. In the present report we analyzed the origin of this feature based on finite-difference time-domain (FDTD) approach as well as a simple point dipole model that incorporates the interparticle interaction with the dipole-dipole potential. It has been found that the simple point dipole model is useful for qualitative discussion on the optical field distribution in the metal nanoparticle assemblies. From the analysis, we have found that the interparticle interaction, which causes the propagation of the plasmon excitation in the assemblies, seems to be essential for the localization of the enhanced field at the rim. We propose that regular close-packed assemblies do not yield efficiently enhanced optical fields in visible to near-infrared region, and rather assemblies with large fluctuation are more advantageous to get highly enhanced fields.

本文言語English
ページ(範囲)154-159
ページ数6
ジャーナルJournal of Photochemistry and Photobiology A: Chemistry
221
2-3
DOI
出版ステータスPublished - 2011 6 25

ASJC Scopus subject areas

  • 化学 (全般)
  • 化学工学(全般)
  • 物理学および天文学(全般)

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