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arXiv · 2401.12702

Imaging of Antiferroelectric Dark Modes in an Inverted Plasmonic Lattice

Javier Rodriguez Alvarez·Amilcar Labarta·Juan Carlos Idrobo·Rossana Dell Anna·Alessandro Cian·Damiano Giubertoni·Xavier Borrise·Albert Guerrero·Francesc Perez Murano·Arantxa Fraile Rodriguez·Xavier Batlle
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Abstract

Plasmonic lattice nanostructures are of technological interest because of their capacity to manipulate light below the diffraction limit. Here, we present a detailed study of dark and bright modes in the visible and near-infrared energy regime of an inverted plasmonic honeycomb lattice by a combination of Au+ focused ion beam lithography with nanometric resolution, optical and electron spectroscopy, and finite-difference time-domain simulations. The lattice consists of slits carved in a gold thin film, exhibiting hotspots and a set of bright and dark modes. We proposed that some of the dark modes detected by electron energy-loss spectroscopy are caused by antiferroelectric arrangements of the slit polarizations with two times the size of the hexagonal unit cell. The plasmonic resonances take place within the 0.5_2 eV energy range, indicating that they could be suitable for a synergistic coupling with excitons in two-dimensional transition metal dichalcogenides materials or for designing nanoscale sensing platforms based on near-field enhancement over a metallic surface.

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Javier Rodriguez Alvarez, Amilcar Labarta, Juan Carlos Idrobo, Rossana Dell Anna, Alessandro Cian, Damiano Giubertoni, Xavier Borrise, Albert Guerrero, Francesc Perez Murano, Arantxa Fraile Rodriguez, Xavier Batlle. 2024-01-23. Imaging of Antiferroelectric Dark Modes in an Inverted Plasmonic Lattice. https://doi.org/10.1021/acsnano.2c11016

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