Semiconductor nanowire arrays for optical sensing: a numerical insight on the impact of array periodicity and density

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dc.check.date2022-05-10
dc.check.infoAccess to this article is restricted until 12 months after publication by request of the publisher.en
dc.contributor.authorZagaglia, Luca
dc.contributor.authorDemontis, Valeria
dc.contributor.authorRossella, Francesco
dc.contributor.authorFloris, Francesco
dc.contributor.funderScience Foundation Irelanden
dc.date.accessioned2021-05-18T09:37:20Z
dc.date.available2021-05-18T09:37:20Z
dc.date.issued2021-05-10
dc.date.updated2021-05-18T09:21:58Z
dc.description.abstractRecent advances in the nanofabrication and modelling of metasurfaces have shown the potential of these systems in providing unprecedented control over light-matter interactions at the nanoscale, enabling immediate and tangible improvement of features and specifications of photonic devices that are becoming always more crucial in enhancing everyday life quality. In this work, we theoretically demonstrate that metasurfaces made of periodic and non-periodic deterministic assemblies of vertically aligned semiconductor nanowires can be engineered to display a tailored effective optical response and provide a suitable route to realize advanced systems with controlled photonic properties particularly interesting for sensing applications. The metasurfaces investigated in this paper correspond to nanowire arrays that can be experimentally realized exploiting nanolithography and bottom-up nanowire growth methods: the combination of these techniques allow to finely control the position and the physical properties of each individual nanowire in complex arrays. By resorting to numerical simulations, we address the near- and far-field behavior of a nanowire ensemble and we show that the controlled design and arrangement of the nanowires on the substrate may introduce unprecedented oscillations of light reflectance, yielding a metasurface which displays an electromagnetic behavior with great potential for sensing. Finite-difference time-domain numerical simulations are carried out to tailor the nanostructure parameters and systematically engineer the optical response in the VIS-NIR spectral range. By exploiting our computational-methods we set-up a complete procedure to design and test metasurfaces able to behave as functional sensors. These results are especially encouraging in the perspective of developing arrays of epitaxially grown semiconductor nanowires, where the suggested design can be easily implemented during the nanostructure growth, opening the way to fully engineered nanowire-based optical metamaterials.en
dc.description.sponsorshipScience Foundation Ireland (Grant NO. SFI-12/RC/2276_P2)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationZagaglia, L., Demontis, V., Rossella, F. and Floris, F. (2021) 'Semiconductor nanowire arrays for optical sensing: a numerical insight on the impact of array periodicity and density', Nanotechnology. doi: 10.1088/1361-6528/abff8ben
dc.identifier.doi10.1088/1361-6528/abff8ben
dc.identifier.eissn1361-6528
dc.identifier.issn0957-4484
dc.identifier.journaltitleNanotechnologyen
dc.identifier.urihttps://hdl.handle.net/10468/11340
dc.language.isoenen
dc.publisherIOP Publishingen
dc.rights© 2021, IOP Publishing. This is an author-created, un-copyedited version of an article accepted for publication in Nanotechnology. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-6528/abff8b. This Accepted Manuscript will be available for reuse under a CC BY-NC-ND 3.0 licence after a 12 month embargo period.en
dc.rights.urihttps://creativecommons.org/licences/by-nc-nd/3.0en
dc.subjectMetamaterialsen
dc.subjectMetasurfacesen
dc.subjectSemiconductor nanowiresen
dc.subjectCore-shellen
dc.subjectOptical reflectanceen
dc.subjectSensingen
dc.subjectNumerical simulationsen
dc.titleSemiconductor nanowire arrays for optical sensing: a numerical insight on the impact of array periodicity and densityen
dc.typeArticle (peer-reviewed)en
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