Probing the electromagnetic response of dielectric antennas by vortex electron beams

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dc.contributor.authorKonečná, Andreacs
dc.contributor.authorSchmidt, Mikolaj K.cs
dc.contributor.authorHillenbrand, Rainercs
dc.contributor.authorAizpurua, Javiercs
dc.coverage.issue2cs
dc.coverage.volume5cs
dc.date.issued2023-06-26cs
dc.description.abstractFocused beams of electrons, which act as both sources and sensors of electric fields, can be used to characterize the electric response of complex photonic systems by locally probing the induced optical near fields. This functionality can be complemented by embracing the recently developed vortex electron beams (VEBs), made up of electrons with orbital angular momentum, which could, in addition, probe induced magnetic near fields. In this work we revisit the theoretical description of this technique, dubbed vortex electron energy-loss spectroscopy (v-EELS). We map the fundamental, quantum-mechanical picture of the scattering of the VEB electrons to the intuitive classical models, which treat the electron beams as a superposition of linear electric and magnetic currents. We then apply this formalism to characterize the optical response of dielectric nanoantennas with v-EELS. Our calculations reveal that VEB electrons probe electric or magnetic modes with different efficiency, which can be adjusted by changing either beam vorticity or acceleration voltage to determine the nature of the probed excitations. We also study a chirally arranged nanostructure, which in the interaction with electron vortices produces dichroism in electron-energy-loss spectra. Our theoretical work establishes VEBs as versatile probes that could provide information on optical excitations otherwise inaccessible with conventional electron beams.en
dc.formattextcs
dc.format.extent1-16cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationPhysical Review Research. 2023, vol. 5, issue 2, p. 1-16.en
dc.identifier.doi10.1103/PhysRevResearch.5.023192cs
dc.identifier.issn2643-1564cs
dc.identifier.orcid0000-0002-7423-5481cs
dc.identifier.other184844cs
dc.identifier.researcheridAAI-4838-2020cs
dc.identifier.urihttp://hdl.handle.net/11012/244958
dc.language.isoencs
dc.publisherAMER PHYSICAL SOCcs
dc.relation.ispartofPhysical Review Researchcs
dc.relation.urihttps://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.5.023192cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/2643-1564/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectENERGY-LOSSen
dc.subjectLIGHT-SCATTERINGen
dc.subjectMIE RESONANCESen
dc.subjectMODESen
dc.subjectSURFACEen
dc.subjectEXCITATIONSen
dc.subjectABSORPTIONen
dc.subjectGENERATIONen
dc.subjectEMISSIONen
dc.subjectSPHEREen
dc.titleProbing the electromagnetic response of dielectric antennas by vortex electron beamsen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
eprints.grantNumberinfo:eu-repo/grantAgreement/GA0/GM/GM23-05119Mcs
sync.item.dbidVAV-184844en
sync.item.dbtypeVAVen
sync.item.insts2025.02.03 15:48:24en
sync.item.modts2025.01.17 16:52:00en
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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