Excitation of Multipole Plasmons by Optical Vortex Beams

Localized surface plasmon resonance (LSPR) has been shown to exhibit a strong potential for nanoscale electromagnetic field manipulation beyond the diffraction limit. Particularly dark mode plasmons circumvent radiation loss and store the energy long in time, which raise the prospect of interesting...

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Bibliographic Details
Published in:Scientific reports 2015-02, Vol.5 (1), p.8431-8431, Article 8431
Main Authors: Sakai, Kyosuke, Nomura, Kensuke, Yamamoto, Takeaki, Sasaki, Keiji
Format: Article
Language:English
Subjects:
639/624/399/354
639/624/400/1021
Diffraction
Electric fields
Electromagnetic fields
Electromagnetism
Gold
Humanities and Social Sciences
Investigations
multidisciplinary
Nanoparticles
Photons
Science
Surface plasmon resonance
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Summary:Localized surface plasmon resonance (LSPR) has been shown to exhibit a strong potential for nanoscale electromagnetic field manipulation beyond the diffraction limit. Particularly dark mode plasmons circumvent radiation loss and store the energy long in time, which raise the prospect of interesting plasmonics applications, for example biochemical sensing and nanoscale lasing. Here we theoretically investigate a method of exciting multipole plasmons, including dark modes, using normally incident light. By performing numerical calculations, we show that multipole plasmons in metal nanodisks can be selectively excited by circularly-polarized optical vortex beams. We study the electromagnetic fields of the beam cross-sections and their correspondence with the excited multipole plasmon modes with respect to spin and orbital angular momenta. The transfer of angular momentum between photons and plasmons is also discussed.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep08431