Extraordinary spin to orbital angular momentum conversion on guided zone plates

Abstract Focusing systems with high numerical aperture can be used to convert spin angular momentum into orbital angular momentum with efficiencies of 50%, while for low numerical apertures this conversion vanishes. In this paper, based on the properties of binary Fresnel zone plates, we propose a s...

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Autores principales:	Pablo Acebal, Luis Carretero, Salvador Blaya
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/110d472f4d494a329372413027031157
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spelling	oai:doaj.org-article:110d472f4d494a3293724130270311572021-12-02T18:03:21ZExtraordinary spin to orbital angular momentum conversion on guided zone plates10.1038/s41598-021-87456-92045-2322https://doaj.org/article/110d472f4d494a3293724130270311572021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-87456-9https://doaj.org/toc/2045-2322Abstract Focusing systems with high numerical aperture can be used to convert spin angular momentum into orbital angular momentum with efficiencies of 50%, while for low numerical apertures this conversion vanishes. In this paper, based on the properties of binary Fresnel zone plates, we propose a structure that is achieved by making an accurate selection of the width and the depth of the rings. This allows us to obtain a large increase in the spin to orbital angular momentum conversion of the resulting focusing fields, and it also has the special characteristic that the obtained conversion is higher for low numerical aperture structures, where standard focusing systems do not work. The ability of the system to perform this extraordinary conversion is demonstrated by FDTD methods and an analytical model developed using a combination of guided mode theory for the structure and Stratton–Chu diffraction theory.Pablo AcebalLuis CarreteroSalvador BlayaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Pablo Acebal Luis Carretero Salvador Blaya Extraordinary spin to orbital angular momentum conversion on guided zone plates
description	Abstract Focusing systems with high numerical aperture can be used to convert spin angular momentum into orbital angular momentum with efficiencies of 50%, while for low numerical apertures this conversion vanishes. In this paper, based on the properties of binary Fresnel zone plates, we propose a structure that is achieved by making an accurate selection of the width and the depth of the rings. This allows us to obtain a large increase in the spin to orbital angular momentum conversion of the resulting focusing fields, and it also has the special characteristic that the obtained conversion is higher for low numerical aperture structures, where standard focusing systems do not work. The ability of the system to perform this extraordinary conversion is demonstrated by FDTD methods and an analytical model developed using a combination of guided mode theory for the structure and Stratton–Chu diffraction theory.
format	article
author	Pablo Acebal Luis Carretero Salvador Blaya
author_facet	Pablo Acebal Luis Carretero Salvador Blaya
author_sort	Pablo Acebal
title	Extraordinary spin to orbital angular momentum conversion on guided zone plates
title_short	Extraordinary spin to orbital angular momentum conversion on guided zone plates
title_full	Extraordinary spin to orbital angular momentum conversion on guided zone plates
title_fullStr	Extraordinary spin to orbital angular momentum conversion on guided zone plates
title_full_unstemmed	Extraordinary spin to orbital angular momentum conversion on guided zone plates
title_sort	extraordinary spin to orbital angular momentum conversion on guided zone plates
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/110d472f4d494a329372413027031157
work_keys_str_mv	AT pabloacebal extraordinaryspintoorbitalangularmomentumconversiononguidedzoneplates AT luiscarretero extraordinaryspintoorbitalangularmomentumconversiononguidedzoneplates AT salvadorblaya extraordinaryspintoorbitalangularmomentumconversiononguidedzoneplates
_version_	1718378733658701824

Extraordinary spin to orbital angular momentum conversion on guided zone plates

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