Unidirectional side scattering of light by a single-element nanoantenna

Dries Vercruysse, Yannick Sonnefraud, Niels Verellen, Fabian B. Fuchs, Giuliana Di Martino, Liesbet Lagae, Victor V. Moshchalkov, Stefan A. Maier, Pol Van Dorpe

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158 Citations (Scopus)

Abstract

Unidirectional side scattering of light by a single-element plasmonic nanoantenna is demonstrated using full-field simulations and back focal plane measurements. We show that the phase and amplitude matching that occurs at the Fano interference between two localized surface plasmon modes in a V-shaped nanoparticle lies at the origin of this effect. A detailed analysis of the V-antenna modeled as a system of two coherent point-dipole sources elucidates the mechanisms that give rise to a tunable experimental directivity as large as 15 dB. The understanding of Fano-based directional scattering opens a way to develop new directional optical antennas for subwavelength color routing and self-referenced directional sensing. In addition, the directionality of these nanoantennas can increase the detection efficiency of fluorescence and surface enhanced Raman scattering.

Original languageEnglish
Pages (from-to)3843-3849
Number of pages7
JournalNano Letters
Volume13
Issue number8
DOIs
Publication statusPublished - 14 Aug 2013
Externally publishedYes

Keywords

  • directionality
  • Fano resonance
  • Nanoantenna
  • side scattering
  • surface plasmon resonance

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