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Article

Directional Plasmonic Excitation by Helical Nanotips

1
Electrical and Electronics Engineering Department, Ariel University, Ariel 40700, Israel
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Department of Physics and Materials Science, University of Luxembourg, 162a avenue de la Faïencerie, L-1511 Luxembourg, Luxembourg
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Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
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Libera Università di Bolzano, Piazza Università 1, 39100 Bolzano, Italy
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Mechanical Engineering and Mechatronics Department, Ariel University, Ariel 40700, Israel
*
Authors to whom correspondence should be addressed.
Academic Editor: Andrey B. Evlyukhin
Nanomaterials 2021, 11(5), 1333; https://doi.org/10.3390/nano11051333
Received: 19 April 2021 / Revised: 14 May 2021 / Accepted: 17 May 2021 / Published: 19 May 2021
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. View Full-Text
Keywords: plasmonics; nanotip; chiral; symmetry breaking; directional excitation plasmonics; nanotip; chiral; symmetry breaking; directional excitation
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MDPI and ACS Style

Singh, L.; Maccaferri, N.; Garoli, D.; Gorodetski, Y. Directional Plasmonic Excitation by Helical Nanotips. Nanomaterials 2021, 11, 1333. https://doi.org/10.3390/nano11051333

AMA Style

Singh L, Maccaferri N, Garoli D, Gorodetski Y. Directional Plasmonic Excitation by Helical Nanotips. Nanomaterials. 2021; 11(5):1333. https://doi.org/10.3390/nano11051333

Chicago/Turabian Style

Singh, Leeju, Nicolò Maccaferri, Denis Garoli, and Yuri Gorodetski. 2021. "Directional Plasmonic Excitation by Helical Nanotips" Nanomaterials 11, no. 5: 1333. https://doi.org/10.3390/nano11051333

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