Subwavelength silicon through-hole arrays as an all-dielectric broadband terahertz gradient index metamaterial

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dc.contributor.authorPark, Sang Gilko
dc.contributor.authorLee, Kangheeko
dc.contributor.authorHan, Daehoonko
dc.contributor.authorAhn, Jaewookko
dc.contributor.authorJeong, KI-HUNko
dc.date.accessioned2015-03-27T08:04:05Z-
dc.date.available2015-03-27T08:04:05Z-
dc.date.created2014-11-11-
dc.date.created2014-11-11-
dc.date.created2014-11-11-
dc.date.issued2014-09-
dc.identifier.citationAPPLIED PHYSICS LETTERS, v.105, no.9-
dc.identifier.issn0003-6951-
dc.identifier.urihttp://hdl.handle.net/10203/194535-
dc.description.abstractStructuring at subwavelength scales brings out artificial media with anomalous optical features called metamaterials. All-dielectric metamaterials have high potential for practical applications over the whole electromagnetic spectrum owing to low loss and optical isotropy. Here, we report subwavelength silicon through-hole arrays as an all-dielectric gradient index metamaterial with broadband THz operation. The unit cell consists of a single subwavelength through-hole on highly resistive monocrystalline silicon. Depending on the fill-factor and period, the effective index was linearly modulated at 0.3-1.6 THz. The experimental results also demonstrate silicon gradient refractive index (Si-GRIN) lenses with parabolic index profiles through the spatial modification of a single unit cell along the radial direction. Si-GRIN lenses either focus 0.4-1.6 THz beam to the diffraction-limit or serve as a flat and thin solid immersion lens on the backside of THz photoconductive antenna for highly efficient pulse extraction. This all-dielectric gradient index metamaterial opens up opportunities for integrated THz GRIN optics.-
dc.languageEnglish-
dc.publisherAMER INST PHYSICS-
dc.titleSubwavelength silicon through-hole arrays as an all-dielectric broadband terahertz gradient index metamaterial-
dc.typeArticle-
dc.identifier.wosid000342749800001-
dc.identifier.scopusid2-s2.0-84907332724-
dc.type.rimsART-
dc.citation.volume105-
dc.citation.issue9-
dc.citation.publicationnameAPPLIED PHYSICS LETTERS-
dc.identifier.doi10.1063/1.4894054-
dc.contributor.localauthorAhn, Jaewook-
dc.contributor.localauthorJeong, KI-HUN-
dc.contributor.nonIdAuthorLee, Kanghee-
dc.contributor.nonIdAuthorHan, Daehoon-
dc.type.journalArticleArticle-
dc.subject.keywordPlusFREQUENCIES-
dc.subject.keywordPlusFABRICATION-
dc.subject.keywordPlusCLOAK-
dc.subject.keywordPlusLENS-
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