Pairing Toroidal and Magnetic Dipole Resonances in Elliptic Dielectric Rod Metasurfaces for Reconfigurable Wavefront Manipulation in Reflection

dc.contributor.author Tsilipakos, Odysseas
dc.contributor.author Tasolamprou, Anna
dc.contributor.author Koschny, Thomas
dc.contributor.author Canfield, Paul
dc.contributor.author Kafesaki, Maria
dc.contributor.author Economou, Eleftherios
dc.contributor.author Soukoulis, Costas
dc.contributor.department Ames Laboratory
dc.contributor.department Ames National Laboratory
dc.date 2019-11-20T21:57:01.000
dc.date.accessioned 2020-06-29T23:22:34Z
dc.date.available 2020-06-29T23:22:34Z
dc.date.issued 2018-09-17
dc.description.abstract <p>A novel approach for reconfigurable wavefront manipulation with gradient metasurfaces based on permittivity‐modulated elliptic dielectric rods is proposed. It is shown that the required 2π phase span in the local electromagnetic response of the metasurface can be achieved by pairing the lowest magnetic dipole Mie resonance with a toroidal dipole Mie resonance, instead of using the lowest two Mie resonances corresponding to fundamental electric and magnetic dipole resonances as customarily exercised. This approach allows for the precise matching of both the resonance frequencies and quality factors. Moreover, the accurate matching is preserved if the rod permittivity is varied, allowing for constructing reconfigurable gradient metasurfaces by locally modulating the permittivity in each rod. Highly efficient tunable beam steering and beam focusing with ultrashort focal lengths are numerically demonstrated, highlighting the advantage of the low‐profile metasurfaces over bulky conventional lenses. Notably, despite using a matched pair of Mie resonances, the presence of an electric polarizability background allows to perform the wavefront shaping operations in reflection, rather than transmission. This has the advantage that any control circuitry necessary in an experimental realization can be accommodated behind the metasurface without affecting the electromagnetic response.</p>
dc.identifier archive/lib.dr.iastate.edu/ameslab_manuscripts/359/
dc.identifier.articleid 1367
dc.identifier.contextkey 14909423
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ameslab_manuscripts/359
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/7299
dc.language.iso en
dc.relation.ispartofseries IS-J 9789
dc.source.bitstream archive/lib.dr.iastate.edu/ameslab_manuscripts/359/IS_J_9789.pdf|||Fri Jan 14 23:45:58 UTC 2022
dc.source.uri 10.1002/adom.201800633
dc.subject.disciplines Semiconductor and Optical Materials
dc.subject.keywords anomalous reflection
dc.subject.keywords gradient metasurfaces
dc.subject.keywords Mie resonances
dc.subject.keywords toroidal dipole
dc.subject.keywords tunable
dc.title Pairing Toroidal and Magnetic Dipole Resonances in Elliptic Dielectric Rod Metasurfaces for Reconfigurable Wavefront Manipulation in Reflection
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication c5a8128b-7d98-4b8f-92d7-b1385e345713
relation.isOrgUnitOfPublication 25913818-6714-4be5-89a6-f70c8facdf7e
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