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Diffractive dipolar coupling in non-Bravais plasmonic lattices.

Abstract

Honeycomb plasmonic lattices are paradigmatic examples of non-Bravais lattices. We experimentally measure Surface Lattice Resonances in effectively free-standing honeycomb lattices composed of silver nanospheres. By combining numerical simulations with analytical methods, we analyze the dispersion relation and the near-field properties of these modes along high symmetry trajectories. We find that our results can be interpreted in terms of dipole-only interactions between the two non-equivalent triangular sublattices, which naturally lead to an asymmetric near-field distribution around the nanospheres. We generalize the interaction between the two sublattices to the case of variable adjacent interparticle distance within the unit cell, highlighting symmetry changes and diffraction degeneracy lifting associated to the transition between Bravais and non-Bravais lattices.

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Accepted
09 Feb 2020
First published
11 Feb 2020

This article is Open Access

Nanoscale Adv., 2020, Accepted Manuscript
Article type
Paper

Diffractive dipolar coupling in non-Bravais plasmonic lattices.

D. Becerril, O. Vázquez, D. Piccotti, E. M. Sandoval, T. Cesca, G. Mattei, C. Noguez and G. Pirruccio, Nanoscale Adv., 2020, Accepted Manuscript , DOI: 10.1039/D0NA00095G

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