Spatio-spectral metrics in electron energy loss spectroscopy as a tool to resolve nearly degenerate plasmon modes in dimer plasmonic antennas

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dc.contributor.authorHorák, Michalcs
dc.contributor.authorKonečná, Andreacs
dc.contributor.authorŠikola, Tomášcs
dc.contributor.authorKřápek, Vlastimilcs
dc.coverage.issue15cs
dc.coverage.volume12cs
dc.date.issued2023-06-19cs
dc.description.abstractElectron energy loss spectroscopy (EELS) is often utilized to characterize localized surface plasmon modes supported by plasmonic antennas. However, the spectral resolution of this technique is only mediocre, and it can be rather difficult to resolve modes close in the energy, such as coupled modes of dimer antennas. Here, we address this issue for a case study of the dimer plasmonic antenna composed of two gold discs. We analyze four nearly degenerate coupled plasmon modes of the dimer: longitudinal and transverse bonding and antibonding dipole modes. With a traditional approach, which takes into account the spectral response of the antennas recorded at specific points, the modes cannot be experimentally identified with EELS. Therefore, we employ the spectral and spatial sensitivity of EELS simultaneously. We propose several metrics that can be utilized to resolve the modes. First, we utilize electrodynamic simulations to verify that the metrics indeed represent the spectral positions of the plasmon modes. Next, we apply the metrics to experimental data, demonstrating their ability to resolve three of the above-mentioned modes (with transverse bonding and antibonding modes still unresolved), identify them unequivocally, and determine their energies. In this respect, the spatio-spectral metrics increase the information extracted from electron energy loss spectroscopy applied to plasmonic antennas.en
dc.formattextcs
dc.format.extent3089-3098cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationNanophotonics. 2023, vol. 12, issue 15, p. 3089-3098.en
dc.identifier.doi10.1515/nanoph-2023-0153cs
dc.identifier.issn2192-8606cs
dc.identifier.orcid0000-0001-6503-8294cs
dc.identifier.orcid0000-0002-7423-5481cs
dc.identifier.orcid0000-0003-4217-2276cs
dc.identifier.orcid0000-0002-4047-8653cs
dc.identifier.other184195cs
dc.identifier.researcheridR-2546-2017cs
dc.identifier.researcheridAAI-4838-2020cs
dc.identifier.researcheridA-6917-2013cs
dc.identifier.scopus57200608539cs
dc.identifier.urihttp://hdl.handle.net/11012/213827
dc.language.isoencs
dc.publisherWALTER DE GRUYTER GMBHcs
dc.relation.ispartofNanophotonicscs
dc.relation.urihttps://doi.org/10.1515/nanoph-2023-0153cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/2192-8606/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectelectron energy loss spectroscopyen
dc.subjecthybridizationen
dc.subjectlocalized surface plasmonen
dc.subjectspectrum imageen
dc.titleSpatio-spectral metrics in electron energy loss spectroscopy as a tool to resolve nearly degenerate plasmon modes in dimer plasmonic antennasen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-184195en
sync.item.dbtypeVAVen
sync.item.insts2025.02.03 15:48:23en
sync.item.modts2025.01.17 16:37:06en
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. Ústav fyzikálního inženýrstvícs
thesis.grantorVysoké učení technické v Brně. Středoevropský technologický institut VUT. Příprava a charakterizace nanostrukturcs
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