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Switchable directional scattering of electromagnetic radiation with subwavelength asymmetric silicon dimers

High refractive index dielectric nanoparticles show high promise as a complementary nanophotonics platform due to compared with plasmonic nanostructures low absorption losses and the co-existence of magnetic and electric resonances. Here we explore their use as resonantly enhanced directional scatte...

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Detalles Bibliográficos
Autores principales: Albella, Pablo, Shibanuma, Toshihiko, Maier, Stefan A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4674758/
https://www.ncbi.nlm.nih.gov/pubmed/26656864
http://dx.doi.org/10.1038/srep18322
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author Albella, Pablo
Shibanuma, Toshihiko
Maier, Stefan A.
author_facet Albella, Pablo
Shibanuma, Toshihiko
Maier, Stefan A.
author_sort Albella, Pablo
collection PubMed
description High refractive index dielectric nanoparticles show high promise as a complementary nanophotonics platform due to compared with plasmonic nanostructures low absorption losses and the co-existence of magnetic and electric resonances. Here we explore their use as resonantly enhanced directional scatterers. We theoretically demonstrate that an asymmetric dimer of silicon nanoparticles shows tuneable directional scattering depending on the frequency of excitation. This is due to the interference between electric and magnetic dipoles excited in each nanoparticle, enabling directional control of the scattered light. Interestingly, this control can be achieved regardless of the polarization direction with respect to the dimer axis; however, difference in the polarization can shift the wavelengths at which the directional scattering is achieved. We also explore the application of such an asymmetric nanoantenna as a tuneable routing element in a nanometer scale, suggesting applications in optical nanocircuitry.
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spelling pubmed-46747582015-12-16 Switchable directional scattering of electromagnetic radiation with subwavelength asymmetric silicon dimers Albella, Pablo Shibanuma, Toshihiko Maier, Stefan A. Sci Rep Article High refractive index dielectric nanoparticles show high promise as a complementary nanophotonics platform due to compared with plasmonic nanostructures low absorption losses and the co-existence of magnetic and electric resonances. Here we explore their use as resonantly enhanced directional scatterers. We theoretically demonstrate that an asymmetric dimer of silicon nanoparticles shows tuneable directional scattering depending on the frequency of excitation. This is due to the interference between electric and magnetic dipoles excited in each nanoparticle, enabling directional control of the scattered light. Interestingly, this control can be achieved regardless of the polarization direction with respect to the dimer axis; however, difference in the polarization can shift the wavelengths at which the directional scattering is achieved. We also explore the application of such an asymmetric nanoantenna as a tuneable routing element in a nanometer scale, suggesting applications in optical nanocircuitry. Nature Publishing Group 2015-12-10 /pmc/articles/PMC4674758/ /pubmed/26656864 http://dx.doi.org/10.1038/srep18322 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Albella, Pablo
Shibanuma, Toshihiko
Maier, Stefan A.
Switchable directional scattering of electromagnetic radiation with subwavelength asymmetric silicon dimers
title Switchable directional scattering of electromagnetic radiation with subwavelength asymmetric silicon dimers
title_full Switchable directional scattering of electromagnetic radiation with subwavelength asymmetric silicon dimers
title_fullStr Switchable directional scattering of electromagnetic radiation with subwavelength asymmetric silicon dimers
title_full_unstemmed Switchable directional scattering of electromagnetic radiation with subwavelength asymmetric silicon dimers
title_short Switchable directional scattering of electromagnetic radiation with subwavelength asymmetric silicon dimers
title_sort switchable directional scattering of electromagnetic radiation with subwavelength asymmetric silicon dimers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4674758/
https://www.ncbi.nlm.nih.gov/pubmed/26656864
http://dx.doi.org/10.1038/srep18322
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