Issue 3, 2020

Diffractive dipolar coupling in non-Bravais plasmonic lattices


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.

Graphical abstract: Diffractive dipolar coupling in non-Bravais plasmonic lattices

Supplementary files

Article information

Article type
04 Feb 2020
09 Feb 2020
First published
11 Feb 2020
This article is Open Access
Creative Commons BY license

Nanoscale Adv., 2020,2, 1261-1268

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, 2, 1261 DOI: 10.1039/D0NA00095G

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