Imaging of Antiferroelectric Dark Modes in an Inverted Plasmonic Lattice
Rodríguez-Álvarez, Javier (Universitat de Barcelona)
Labarta, Amílcar (Universitat de Barcelona)
Idrobo, Juan Carlos (University of Washington)
Dell'Anna, Rossana (FBK - Bruno Kessler Foundation)
Cian, Alessandro (FBK - Bruno Kessler Foundation)
Giubertoni, Damiano (FBK - Bruno Kessler Foundation)
Borrisé, Xavier (Institut Català de Nanociència i Nanotecnologia)
Guerrero, Albert (Institut de Microelectrònica de Barcelona)
Pérez Murano, Francesc (Institut de Microelectrònica de Barcelona)
Fraile Rodríguez, Arantxa (Universitat de Barcelona)
Batlle, Xavier (Universitat de Barcelona)

Date:	2023
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.
Grants:	Ministerio de Ciencia e Innovación PID2021-127397NB-I00 Agencia Estatal de Investigación PGC2018-097789-B-I00
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Plasmonic ; Honeycomb lattice ; Inverted lattice ; Dark modes ; EELS ; Antiferroelectric ; SLR
Published in:	ACS nano, Vol. 17, Issue 9 (May 2023) , p. 8123-8132, ISSN 1936-086X

DOI: 10.1021/acsnano.2c11016
PMID: 37089111

10 p, 6.4 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles