Near- and far-field properties of plasmonic oligomers under radially and azimuthally polarized light excitation

Avner Yanai, Meir Grajower, Gilad M. Lerman, Mario Hentschel, Harald Giessen, Uriel Levy*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

We present a comprehensive experimental and theoretical study on the near- and far-field properties of plasmonic oligomers using radially and azimuthally polarized excitation. These unconventional polarization states are perfectly matched to the high spatial symmetry of the oligomers and thus allow for the excitation of some of the highly symmetric eigenmodes of the structures, which cannot be excited by linearly polarized light. In particular, we study hexamer and heptamer structures and strikingly find very similar optical responses, as well as the absence of a Fano resonance. Furthermore, we investigate the near-field distributions of the oligomers using near-field scanning optical microscopy (NSOM). We observe significantly enhanced near-fields, which arise from efficient excitation of the highly symmetric eigenmodes by the radially and azimuthally polarized light fields. Our study opens up possibilities for tailored light-matter interaction, combining the design freedom of complex plasmonic structures with the remarkable properties of radially and azimuthally polarized light fields.

Original languageAmerican English
Pages (from-to)4969-4974
Number of pages6
JournalACS Nano
Volume8
Issue number5
DOIs
StatePublished - 27 May 2014

Keywords

  • near-field scanning optical microscopy
  • oligomers
  • plasmons
  • radial and azimuthal polarization

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