J. Eur. Opt. Soc.-Rapid Publ.
Volume 13, Number 1, 2017
|Number of page(s)||7|
|Published online||13 September 2017|
Exclusive and efficient excitation of plasmonic breathing modes of a metallic nanodisc with the radially polarized optical beams
Institute of Modern Optics, College of Electronic Information and Optical Engineering, Nankai University, 300071, Tianjin, China
2 Nanophotonics Research Centre & Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, 518060, Shenzhen, China
Accepted: 4 September 2017
Background: The plasmonic breathing modes of a metallic nanodisc are dark plasmonic modes and thus also have the advantage of much smaller radiation loss. These modes emerged previously in electron energy loss spectroscopy experiments and were then pursued with optical excitation methods.
Results: In this paper, through the finite element method type numerical simulations, we show evidence of the pure excitation of these modes under the illumination of two counter-propagating, radially-polarized optical beams. The obtained near-field spectrum of a single Au or Ag nanodisc shows the plasmonic resonant peaks at which the electric field distributions, as well as the plasmonic dispersion relationship both clearly exhibit the characteristics of the plasmonic breathing modes.
Conclusion: We expect that the method that we have proposed, due to operating conveniently in the manner of far field excitation, will open many possibilities in practical applications based on the interaction between a single metal nanodisc with the radially polarized optical beam or between a metal nanodisc array with the beam array.
Key words: Surface plasmon / Plasmonic breathing mode / Radially polarized optical beam / Metallic nanodisc
© The Author(s) 2017
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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