Subwavelength grating-based spiral metalens for tight focusing of laser light

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dc.check.date2020-04-12
dc.check.infoAccess to this article is restricted until 12 months after publication by request of the publisher.en
dc.contributor.authorKotlyar, Victor V.
dc.contributor.authorStafeev, Sergey S.
dc.contributor.authorNalimov, Anton G.
dc.contributor.authorO'Faolain, Liam
dc.contributor.funderRussian Science Foundationen
dc.contributor.funderMinistry of Education and Science of the Russian Federationen
dc.date.accessioned2019-05-10T08:41:04Z
dc.date.available2019-05-10T08:41:04Z
dc.date.issued2019-04-12
dc.description.abstractIn this paper, we investigate a 16-sector spiral metalens fabricated on a thin film (130 nm) of amorphous silicon, consisting of a set of subwavelength binary diffractive gratings and with a numerical aperture that is close to unity. The metalens converts linearly polarized incident light into an azimuthally polarized optical vortex and focuses it at a distance approximately equal to the wavelength of the incident light, k ¼ 633 nm. Using a scanning near-field optical microscope, it is shown experimentally that the metalens forms an elliptical focal spot with diameters smaller than the diffraction limit: FWHMx ¼ 0.32k (60.03k) and FWHMy ¼ 0.51k (60.03k). The experimental results are close to those of a numerical simulation using the FDTD method, with FWHMx ¼ 0.37k and FWHMy ¼ 0.49k. The technological errors due to manufacturing were taken into account in the simulation. This is the smallest focal spot yet obtained with a metalens.en
dc.description.sponsorshipRussian Science Foundation (Project No. 18-19-00595); Ministry of Education and Science of the Russian Federation (Agreement No.007-Uþ/X3363/26)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid141107en
dc.identifier.citationKotlyar, V. V., Stafeev, S. S., Nalimov, A. G. and O'Faolain, L. (2019) ‘Subwavelength grating-based spiral metalens for tight focusing of laser light’, Applied Physics Letters, 114(14), 141107 (5pp). doi: 10.1063/1.5092760en
dc.identifier.doi10.1063/1.5092760en
dc.identifier.eissn1077-3118
dc.identifier.endpage5en
dc.identifier.issn0003-6951
dc.identifier.issued14en
dc.identifier.journaltitleApplied Physics Lettersen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/7875
dc.identifier.volume114en
dc.language.isoenen
dc.publisherAIP Publishingen
dc.rights© 2019, the Authors. Published by AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared as Kotlyar, V. V., Stafeev, S. S., Nalimov, A. G. and O'Faolain, L. (2019) ‘Subwavelength grating-based spiral metalens for tight focusing of laser light’, Applied Physics Letters, 114(14), 141107 (5pp). doi: 10.1063/1.5092760 and may be found at https://doi.org/10.1063/1.5092760en
dc.subjectMetalensen
dc.subject16-sector spiral metalensen
dc.subjectThin filmen
dc.subject130 nmen
dc.subjectAmorphous siliconen
dc.subjectSubwavelength binary diffractive gratingsen
dc.subjectNumerical apertureen
dc.subjectUnityen
dc.titleSubwavelength grating-based spiral metalens for tight focusing of laser lighten
dc.typeArticle (peer-reviewed)en
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