Singular and Nonsingular Transitions in the Infrared Plasmons of Nearly Touching Nanocube Dimers

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dc.contributor.authorWu, Yinacs
dc.contributor.authorKonečná, Andreacs
dc.contributor.authorCho, Shin Humcs
dc.contributor.authorMilliron, Delia J.cs
dc.contributor.authorHachtel, Jordan A.cs
dc.contributor.authorde Abajo, F. Javier Garcíacs
dc.coverage.issue23cs
dc.coverage.volume18cs
dc.date.accessioned2025-02-03T14:48:33Z
dc.date.available2025-02-03T14:48:33Z
dc.date.issued2024-05-28cs
dc.description.abstractNarrow gaps between plasmon-supporting materials can confine infrared electromagnetic energy at the nanoscale, thus enabling applications in areas such as optical sensing. However, in nanoparticle dimers, the nature of the transition between touching (zero gap) and nearly nontouching (nonzero gap less than or similar to 15 nm) regimes is still a subject of debate. Here, we observe both singular and nonsingular transitions in infrared plasmons confined to dimers of fluorine-doped indium oxide nanocubes when moving from touching to nontouching configurations depending on the dimensionality of the contact region. Through spatially resolved electron energy-loss spectroscopy, we find a continuous spectral evolution of the lowest-order plasmon mode across the transition for finite touching areas, in excellent agreement with the simulations. This behavior challenges the widely accepted idea that a singular transition always emerges in the near-touching regime of plasmonic particle dimers. The apparent contradiction is resolved by theoretically examining different types of gap morphologies, revealing that the presence of a finite touching area renders the transition nonsingular, while one-dimensional and point-like contacts produce a singular behavior in which the lowest-order dipolar mode in the touching configuration, characterized by a net induced charge in each of the particles, becomes unphysical as soon as they are separated. Our results provide valuable insights into the nature of dimer plasmons in highly doped semiconductors.en
dc.formattextcs
dc.format.extent15130-15138cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationACS Nano. 2024, vol. 18, issue 23, p. 15130-15138.en
dc.identifier.doi10.1021/acsnano.4c02644cs
dc.identifier.issn1936-0851cs
dc.identifier.orcid0000-0002-7423-5481cs
dc.identifier.other189999cs
dc.identifier.researcheridAAI-4838-2020cs
dc.identifier.urihttps://hdl.handle.net/11012/249973
dc.language.isoencs
dc.publisherAMER CHEMICAL SOCcs
dc.relation.ispartofACS Nanocs
dc.relation.urihttps://pubs.acs.org/doi/10.1021/acsnano.4c02644cs
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1936-0851/cs
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/cs
dc.subjectinfrared plasmonsen
dc.subjectnanodimersen
dc.subjectfluorine-dopedindium oxideen
dc.subjectelectron energy-loss spectroscopy (EELS)en
dc.subjectconfined optical modesen
dc.titleSingular and Nonsingular Transitions in the Infrared Plasmons of Nearly Touching Nanocube Dimersen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
eprints.grantNumberinfo:eu-repo/grantAgreement/GA0/GM/GM23-05119Mcs
sync.item.dbidVAV-189999en
sync.item.dbtypeVAVen
sync.item.insts2025.02.03 15:48:33en
sync.item.modts2025.01.29 19:32:05en
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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Ústav fyzikálního inženýrství
Příprava a charakterizace nanostruktur