Excitation of multipolar surface plasmon resonance in plasmonic nanoparticles by complex accelerating beams

Yang Yang, Jiafang Li, Zhi Yuan Li, Yue Gang Chen

Research output: Contribution to journalArticlepeer-review

Abstract

In this paper, through a vector-spherical harmonics approach, we investigate the optical spectra of plasmonic Au nanoparticles excited by two special accelerating beams: a non-paraxial Airy beam and a Bessel beam. We systematically analyze the impacts of the beam profile, phase, and helical wave front of the electromagnetic fields on the optical spectrum and the excitation of the surface plasmon resonance (SPR). We find that the high-order phase in the Airy beam would result in strong plasmonic oscillations in the optical spectra, while the cone angle and orbital angular momentum carried by the Bessel beam could be employed to engineer the plasmon modes excited in Au nanoparticles. Furthermore, the optical spectrum excited by a combined Airy-Bessel-Gauss beam is discussed. The study could help to deeply explore new ways to manipulate SPR in metal nanoparticles via the wave front engineering of optical beams for enhancing light-matter interaction and optical sensing performance.

Original languageEnglish
Article number075005
JournalJournal of Optics (United Kingdom)
Volume17
Issue number7
DOIs
Publication statusPublished - 1 Jul 2015
Externally publishedYes

Keywords

  • optical trapping and manipulation
  • plasmonics
  • surface plasmons

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