Plasmonic coupling between metallic nanocavities

Adi Salomon, Yehiam Prior, Michael Fedoruk, Jochen Feldmann, Radoslaw Kolkowski, Joseph Zyss

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41 Scopus citations


We demonstrate strong coupling of nanocavities in metal films, sparked by propagating surface plasmons. Unlike the coupling of metallic nanoparticles which decays over distances of tens of nanometers, the metallic nanocavities display long range coupling at distances of hundreds of nanometers for the properly selected metal/wavelength combinations. Such strong coupling drastically changes the symmetry of the charge distribution around the nanocavities as is evidenced by the nonlinear optical response of the medium. We show that when strongly coupled, equilateral triangular nanocavities lose their individual symmetry to adopt the lower symmetry of the coupled system and respond like a single dipolar entity. A quantitative model is suggested for the transition from individual to strongly coupled nanocavities.

Original languageEnglish
Article number114012
JournalJournal of Optics (United Kingdom)
Issue number11
StatePublished - 1 Nov 2014

Bibliographical note

Publisher Copyright:
© 2014 IOP Publishing Ltd.


  • nanocavities
  • plasmonics
  • second harmonic generation


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