Geometric frustration in a hexagonal lattice of plasmonic nanoelements

Ana Conde-Rubio, Arantxa Fraile Rodríguez, Xavier Borrisé, Francesc Perez-Murano, Xavier Batlle, Amílcar Labarta

    Research output: Contribution to journalArticleResearchpeer-review

    2 Citations (Scopus)

    Abstract

    © 2018 Optical Society of America. We introduce the concept of geometric frustration in plasmonic arrays of nanoelements. In particular, we present the case of a hexagonal lattice of Au nanoasterisks arranged so that the gaps between neighboring elements are small and lead to a strong near-field dipolar coupling. Besides, far-field interactions yield higher-order collective modes around the visible region that follow the translational symmetry of the lattice. However, dipolar excitations of the gaps in the hexagonal array are geometrically frustrated for interactions beyond nearest neighbors, yielding the destabilization of the low energy modes in the near infrared. This in turn results in a slow dynamics of the optical response and a complex interplay between localized and collective modes, a behavior that shares features with geometrically frustrated magnetic systems.
    Original languageEnglish
    Pages (from-to)20211-20224
    JournalOptics Express
    Volume26
    Issue number16
    DOIs
    Publication statusPublished - 6 Aug 2018

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