Highly efficient focusing of terahertz waves with an ultrathin superoscillatory metalens: experimental demonstration

Legaria Lerga, Santiago; Teniente Vallinas, Jorge; Kuznetsov, Sergei A.; Pacheco-Peña, Víctor; Beruete Díaz, Miguel

Highly efficient focusing of terahertz waves with an ultrathin superoscillatory metalens: experimental demonstration

dc.contributor.author	Legaria Lerga, Santiago
dc.contributor.author	Teniente Vallinas, Jorge
dc.contributor.author	Kuznetsov, Sergei A.
dc.contributor.author	Pacheco-Peña, Víctor
dc.contributor.author	Beruete Díaz, Miguel
dc.contributor.department	Institute of Smart Cities - ISC	en
dc.date.accessioned	2025-04-09T16:19:21Z
dc.date.available	2025-04-09T16:19:21Z
dc.date.issued	2021-05-06
dc.date.updated	2025-04-09T16:04:02Z
dc.description.abstract	The performance of an ultrathin (thickness < 0.04λ 0) metasurface superoscillatory lens (metaSOL) is experimentally demonstrated in the terahertz (THz) range. The metaSOL is designed using two different hexagonal unit cells to improve the efficiency and properties of the conventional transparent–opaque zoning approach. The focusing metastructure produces, at a frequency f exp = 295 GHz, a sharp focal spot 8.9λ exp away from its output surface with a transversal resolution of 0.52λ exp (≈25% below the resolution limit imposed by diffraction), a power enhancement of 18.2 dB, and very low side lobe level (−13 dB). Resolution below the diffraction limit is demonstrated in a broad fractional operation bandwidth of 18%. The focusing capabilities of the proposed metaSOL show its potential use in a range of applications such as THz imaging, microscopy, and communications.	en
dc.description.sponsorship	This research was funded by the Spanish Ministerio de Ciencia, Innovación y Universidades, Project RTI2018-094475-B-I00 (MCIU/AEI/FEDER, UE). V.P-P. acknowledges support from the Newcastle University (Newcastle University Research Fellowship). S.K. acknowledges support from the Ministry of Science and Higher Education of the Russian Federation, Project No. 075-15-2020-797.
dc.format.mimetype	application/pdf	en
dc.identifier.citation	Legaria, S., Teniente, J., Kuznetsov, S., Pacheco-Peña, V., Beruete, M. (2021) Highly efficient focusing of terahertz waves with an ultrathin superoscillatory metalens: experimental demonstration. Advanced Photonics Research, 2(9), 1-9. https://doi.org/10.1002/adpr.202000165.
dc.identifier.doi	10.1002/adpr.202000165
dc.identifier.issn	2699-9293
dc.identifier.uri	https://academica-e.unavarra.es/handle/2454/53924
dc.language.iso	eng
dc.publisher	Wiley
dc.relation.ispartof	Advanced Photonics Research, 2021, 2(9), 2000165
dc.relation.projectID	info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-094475-B-I00/ES/
dc.relation.publisherversion	https://doi.org/10.1002/adpr.202000165
dc.rights	© 2021 The Authors. Advanced Photonics Research published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
dc.rights.accessRights	info:eu-repo/semantics/openAccess
dc.rights.uri	https://creativecommons.org/licenses/by/4.0/
dc.subject	Metasurfaces	en
dc.subject	Subwavelength focusing	en
dc.subject	Superoscillations	en
dc.subject	Superoscillatory lens	en
dc.subject	Terahertz	en
dc.title	Highly efficient focusing of terahertz waves with an ultrathin superoscillatory metalens: experimental demonstration	en
dc.type	info:eu-repo/semantics/article
dc.type.version	info:eu-repo/semantics/publishedVersion
dspace.entity.type	Publication
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