Work

Excitation of Multipole Plasmons by Optical Vortex Beams

Year: 2015

Type: article

Abstract: 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.

Source: Scientific Reports

DOI: 10.1038/srep08431

Authors: Kyosuke Sakai, Kensuke Nomura, Takeaki Yamamoto, Keiji Sasaki

Institutions: Hokkaido University, Research Institute for Electronic Science, Hokkaido University

Language: English

Topic: Plasmonic and Surface Plasmon Research

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,690

Funder: Japan Society for the Promotion of Science