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Directional Plasmonic Excitation by Helical Nanotips
The phenomenon of coupling between light and surface plasmon polaritons requires specific momentum matching conditions. In the case of a single scattering object on a metallic surface, such as a nanoparticle or a nanohole, the coupling between a broadband effect, i.e., scattering, and a discrete one...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8158748/ https://www.ncbi.nlm.nih.gov/pubmed/34069339 http://dx.doi.org/10.3390/nano11051333 |
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author | Singh, Leeju Maccaferri, Nicolò Garoli, Denis Gorodetski, Yuri |
author_facet | Singh, Leeju Maccaferri, Nicolò Garoli, Denis Gorodetski, Yuri |
author_sort | Singh, Leeju |
collection | PubMed |
description | The phenomenon of coupling between light and surface plasmon polaritons requires specific momentum matching conditions. In the case of a single scattering object on a metallic surface, such as a nanoparticle or a nanohole, the coupling between a broadband effect, i.e., scattering, and a discrete one, such as surface plasmon excitation, leads to Fano-like resonance lineshapes. The necessary phase matching requirements can be used to engineer the light–plasmon coupling and to achieve a directional plasmonic excitation. Here, we investigate this effect by using a chiral nanotip to excite surface plasmons with a strong spin-dependent azimuthal variation. This effect can be described by a Fano-like interference with a complex coupling factor that can be modified thanks to a symmetry breaking of the nanostructure. |
format | Online Article Text |
id | pubmed-8158748 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-81587482021-05-28 Directional Plasmonic Excitation by Helical Nanotips Singh, Leeju Maccaferri, Nicolò Garoli, Denis Gorodetski, Yuri Nanomaterials (Basel) Article The phenomenon of coupling between light and surface plasmon polaritons requires specific momentum matching conditions. In the case of a single scattering object on a metallic surface, such as a nanoparticle or a nanohole, the coupling between a broadband effect, i.e., scattering, and a discrete one, such as surface plasmon excitation, leads to Fano-like resonance lineshapes. The necessary phase matching requirements can be used to engineer the light–plasmon coupling and to achieve a directional plasmonic excitation. Here, we investigate this effect by using a chiral nanotip to excite surface plasmons with a strong spin-dependent azimuthal variation. This effect can be described by a Fano-like interference with a complex coupling factor that can be modified thanks to a symmetry breaking of the nanostructure. MDPI 2021-05-19 /pmc/articles/PMC8158748/ /pubmed/34069339 http://dx.doi.org/10.3390/nano11051333 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Singh, Leeju Maccaferri, Nicolò Garoli, Denis Gorodetski, Yuri Directional Plasmonic Excitation by Helical Nanotips |
title | Directional Plasmonic Excitation by Helical Nanotips |
title_full | Directional Plasmonic Excitation by Helical Nanotips |
title_fullStr | Directional Plasmonic Excitation by Helical Nanotips |
title_full_unstemmed | Directional Plasmonic Excitation by Helical Nanotips |
title_short | Directional Plasmonic Excitation by Helical Nanotips |
title_sort | directional plasmonic excitation by helical nanotips |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8158748/ https://www.ncbi.nlm.nih.gov/pubmed/34069339 http://dx.doi.org/10.3390/nano11051333 |
work_keys_str_mv | AT singhleeju directionalplasmonicexcitationbyhelicalnanotips AT maccaferrinicolo directionalplasmonicexcitationbyhelicalnanotips AT garolidenis directionalplasmonicexcitationbyhelicalnanotips AT gorodetskiyuri directionalplasmonicexcitationbyhelicalnanotips |