Experimental realization of an epsilon-near-zero graded-index metalens at terahertz frequencies

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dc.contributor.authorPacheco-Peña, Víctor
dc.contributor.authorEngheta, Nader
dc.contributor.authorKuznetsov, Sergei A.
dc.contributor.authorGentselev, Alexandr
dc.contributor.authorBeruete Díaz, Miguel
dc.contributor.departmentIngeniaritza Elektrikoa eta Elektronikoaeu
dc.contributor.departmentInstitute of Smart Cities - ISCen
dc.contributor.departmentIngeniería Eléctrica y Electrónicaes_ES
dc.date.accessioned2017-09-29T18:39:40Z
dc.date.available2017-09-29T18:39:40Z
dc.date.issued2017
dc.description.abstractThe terahertz band has been historically hindered by the lack of efficient generators and detectors, but a series of recent breakthroughs have helped to effectively close the “terahertz gap.” A rapid development of terahertz technology has been possible thanks to the translation of revolutionary concepts from other regions of the electromagnetic spectrum. Among them, metamaterials stand out for their unprecedented ability to control wave propagation and manipulate electromagnetic response of matter. They have become a workhorse in the development of terahertz devices such as lenses, polarizers, etc., with fascinating features. In particular, epsilon-near-zero (ENZ) metamaterials have attracted much attention in the past several years due to their unusual properties such as squeezing, tunneling, and supercoupling where a wave traveling inside an electrically small channel filled with an ENZ medium can be tunneled through it, reducing reflections and coupling most of its energy. Here, we design and experimentally demonstrate an ENZ graded-index (GRIN) metamaterial lens operating at terahertz with a power enhancement of 16.2 dB, using an array of narrow hollow rectangular waveguides working near their cutoff frequencies. This is a demonstration of an ENZ GRIN device at terahertz and can open the path towards other realizations of similar devices enabling full quasioptical processing of terahertz signals.en
dc.format.mimetypeapplication/pdfen
dc.identifier.doi10.1103/PhysRevApplied.8.034036
dc.identifier.issn2331-7019 (Electronic)
dc.identifier.urihttps://academica-e.unavarra.es/handle/2454/25756
dc.language.isoengen
dc.publisherAmerican Physical Societyen
dc.relation.ispartofPhysical Review Applied, 8, 034036 (2017)en
dc.relation.publisherversionhttps://doi.org/10.1103/PhysRevApplied.8.034036
dc.rights© 2017 American Physical Societyen
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.subjectMetamaterialsen
dc.subjectEpsilon near zeroen
dc.subjectTerahertzen
dc.subjectMetalensen
dc.subjectGraded indexen
dc.titleExperimental realization of an epsilon-near-zero graded-index metalens at terahertz frequenciesen
dc.typeinfo:eu-repo/semantics/article
dc.type.versioninfo:eu-repo/semantics/publishedVersion
dspace.entity.typePublication
relation.isAuthorOfPublication7f0a4bcb-4ee3-4161-b562-8b0e0bfddd52
relation.isAuthorOfPublication6853cbd8-0a88-42ab-b165-c51b99cb6353
relation.isAuthorOfPublication.latestForDiscovery7f0a4bcb-4ee3-4161-b562-8b0e0bfddd52

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