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Time-resolved plasmon-assisted generation of optical-vortex pulses

The microscopic mechanism of the light-matter interactions that induce orbital angular momentum (OAM) in electromagnetic fields is not thoroughly understood. In this work, we employ Archimedean spiral vortex generators in time-resolved numerical simulations using the Octopus code to observe the behi...

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Autores principales: Albar, Esra Ilke, Bonafé, Franco P., Kosheleva, Valeriia P., Ohlmann, Sebastian T., Appel, Heiko, Rubio, Angel
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10484912/
https://www.ncbi.nlm.nih.gov/pubmed/37679380
http://dx.doi.org/10.1038/s41598-023-41606-3
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author Albar, Esra Ilke
Bonafé, Franco P.
Kosheleva, Valeriia P.
Ohlmann, Sebastian T.
Appel, Heiko
Rubio, Angel
author_facet Albar, Esra Ilke
Bonafé, Franco P.
Kosheleva, Valeriia P.
Ohlmann, Sebastian T.
Appel, Heiko
Rubio, Angel
author_sort Albar, Esra Ilke
collection PubMed
description The microscopic mechanism of the light-matter interactions that induce orbital angular momentum (OAM) in electromagnetic fields is not thoroughly understood. In this work, we employ Archimedean spiral vortex generators in time-resolved numerical simulations using the Octopus code to observe the behind-the-scenes of OAM generation. We send a perfect circularly-polarized plane-wave light onto plasmonic optical vortex generators and observe the resulting twisted light formation with complete spatio-temporal information. In agreement with previous works, we find that emission from the plasmonic spiral branches shapes the vortex-like structure and governs the OAM generation in the outgoing electromagnetic field. To characterize the generated beam further, we emulate the emission from vortex generators with current emitters preserving the spiral geometry. We subject a point-particle system to the generated field and record the orbital angular momentum transfer between the electromagnetic field and the point particle. Finally, we probe the OAM density locally by studying the induced classical trajectory of point particles, which provides further insight into the spatio-temporal features of the induced OAM.
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spelling pubmed-104849122023-09-09 Time-resolved plasmon-assisted generation of optical-vortex pulses Albar, Esra Ilke Bonafé, Franco P. Kosheleva, Valeriia P. Ohlmann, Sebastian T. Appel, Heiko Rubio, Angel Sci Rep Article The microscopic mechanism of the light-matter interactions that induce orbital angular momentum (OAM) in electromagnetic fields is not thoroughly understood. In this work, we employ Archimedean spiral vortex generators in time-resolved numerical simulations using the Octopus code to observe the behind-the-scenes of OAM generation. We send a perfect circularly-polarized plane-wave light onto plasmonic optical vortex generators and observe the resulting twisted light formation with complete spatio-temporal information. In agreement with previous works, we find that emission from the plasmonic spiral branches shapes the vortex-like structure and governs the OAM generation in the outgoing electromagnetic field. To characterize the generated beam further, we emulate the emission from vortex generators with current emitters preserving the spiral geometry. We subject a point-particle system to the generated field and record the orbital angular momentum transfer between the electromagnetic field and the point particle. Finally, we probe the OAM density locally by studying the induced classical trajectory of point particles, which provides further insight into the spatio-temporal features of the induced OAM. Nature Publishing Group UK 2023-09-07 /pmc/articles/PMC10484912/ /pubmed/37679380 http://dx.doi.org/10.1038/s41598-023-41606-3 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Albar, Esra Ilke
Bonafé, Franco P.
Kosheleva, Valeriia P.
Ohlmann, Sebastian T.
Appel, Heiko
Rubio, Angel
Time-resolved plasmon-assisted generation of optical-vortex pulses
title Time-resolved plasmon-assisted generation of optical-vortex pulses
title_full Time-resolved plasmon-assisted generation of optical-vortex pulses
title_fullStr Time-resolved plasmon-assisted generation of optical-vortex pulses
title_full_unstemmed Time-resolved plasmon-assisted generation of optical-vortex pulses
title_short Time-resolved plasmon-assisted generation of optical-vortex pulses
title_sort time-resolved plasmon-assisted generation of optical-vortex pulses
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10484912/
https://www.ncbi.nlm.nih.gov/pubmed/37679380
http://dx.doi.org/10.1038/s41598-023-41606-3
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