Nanoscale interference patterns of gap-mode multipolar plasmonic fields

• Tanaka, Yoshito

• Sanada, Akio

• Sasaki, Keiji

Abstract

Arbitrary spatial distributions of the electric field of light are formed through the interference of individual wavenumber mode fields with appropriate amplitudes and phases, while the maximum wavenumber in the far field is limited by the wavelength of light. In contrast, localized surface plasmons (LSPs) possess the ability to confine photons strongly into nanometer-scale areas, exceeding the diffraction limit. In particular, gap-mode LSPs produce single-nanometer-sized, highly intense localized fields, known as hot spots. Here, we show the nanoscale spatial profiles of the LSP fields within hot spots, which exhibit complicated fine structures, rather than single peaks. The nanopatterns are created by constructive and destructive interferences of dipolar, quadrupolar, and higher-order multipolar plasmonic modes, which can be drastically altered by controlling parameters of the excitation optical system. The analysis in this study would be useful for proposing new concepts for manipulation and control of light-matter interactions in nanospaces.

Journal

• Scientific Reports

  Scientific Reports 2 764-, 2012-10-24

  Nature Publishing Group

Keywords

• Nanoparticles
• Optical materials and structures
• Applied physics

Details

• CRID: 1050564288965540352
• NII Article ID: 120004979564
• DOI: 10.1038/srep00764
• HANDLE: 2115/50795
• ISSN: 20452322
• Web Site: https://www.nature.com/articles/srep00764
• Web Site: https://www.nature.com/articles/srep00764.pdf
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN