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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/206183
Imaging of Antiferroelectric Dark Modes in an Inverted Plasmonic Lattice
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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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RODRÍGUEZ ÁLVAREZ, Javier, et al. Imaging of Antiferroelectric Dark Modes in an Inverted Plasmonic Lattice. ACS Nano. 2023. Vol. 17, num. 9, pags. 8123-8132. ISSN 1936-0851. [consulted: 18 of June of 2026]. Available at: https://hdl.handle.net/2445/206183