Focusing a Vortex Laser Beam with Polarization Conversion

We show that when strongly focusing a linearly polarized optical vortex with the topological charge 2 (or −2) in the near-focus region, there occurs not only a reverse energy flow (where the projection of the Poynting vector is negative) but the right- (or left-) handed circular polarization of ligh...

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Autores principales:	Victor V. Kotlyar, Anton G. Nalimov, Sergey S. Stafeev
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	optical vortex polarization conversion optical angular momentum Applied optics. Photonics TA1501-1820
Acceso en línea:	https://doaj.org/article/fa3c5867636049b985cb834729b5a265
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id	oai:doaj.org-article:fa3c5867636049b985cb834729b5a265
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spelling	oai:doaj.org-article:fa3c5867636049b985cb834729b5a2652021-11-25T18:43:11ZFocusing a Vortex Laser Beam with Polarization Conversion10.3390/photonics81104802304-6732https://doaj.org/article/fa3c5867636049b985cb834729b5a2652021-10-01T00:00:00Zhttps://www.mdpi.com/2304-6732/8/11/480https://doaj.org/toc/2304-6732We show that when strongly focusing a linearly polarized optical vortex with the topological charge 2 (or −2) in the near-focus region, there occurs not only a reverse energy flow (where the projection of the Poynting vector is negative) but the right- (or left-) handed circular polarization of light as well. Notably, thanks to spin–orbital conversion, the on-axis polarization vector handedness is the same as that of the transverse energy flow, i.e., anticlockwise (clockwise). An absorbing spherical microparticle centered on the optical axis placed in the focus may be expected to rotate anticlockwise (clockwise) around its axis and its center of masses. We also show that in the case of sharp focusing of light with linear polarization (without an optical vortex) before and after focus, the light has an even number of local regions with left- and right-handed circular (elliptical) polarizations. Theoretical predictions are corroborated by the numerical simulation.Victor V. KotlyarAnton G. NalimovSergey S. StafeevMDPI AGarticleoptical vortexpolarization conversionoptical angular momentumApplied optics. PhotonicsTA1501-1820ENPhotonics, Vol 8, Iss 480, p 480 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	optical vortex polarization conversion optical angular momentum Applied optics. Photonics TA1501-1820
spellingShingle	optical vortex polarization conversion optical angular momentum Applied optics. Photonics TA1501-1820 Victor V. Kotlyar Anton G. Nalimov Sergey S. Stafeev Focusing a Vortex Laser Beam with Polarization Conversion
description	We show that when strongly focusing a linearly polarized optical vortex with the topological charge 2 (or −2) in the near-focus region, there occurs not only a reverse energy flow (where the projection of the Poynting vector is negative) but the right- (or left-) handed circular polarization of light as well. Notably, thanks to spin–orbital conversion, the on-axis polarization vector handedness is the same as that of the transverse energy flow, i.e., anticlockwise (clockwise). An absorbing spherical microparticle centered on the optical axis placed in the focus may be expected to rotate anticlockwise (clockwise) around its axis and its center of masses. We also show that in the case of sharp focusing of light with linear polarization (without an optical vortex) before and after focus, the light has an even number of local regions with left- and right-handed circular (elliptical) polarizations. Theoretical predictions are corroborated by the numerical simulation.
format	article
author	Victor V. Kotlyar Anton G. Nalimov Sergey S. Stafeev
author_facet	Victor V. Kotlyar Anton G. Nalimov Sergey S. Stafeev
author_sort	Victor V. Kotlyar
title	Focusing a Vortex Laser Beam with Polarization Conversion
title_short	Focusing a Vortex Laser Beam with Polarization Conversion
title_full	Focusing a Vortex Laser Beam with Polarization Conversion
title_fullStr	Focusing a Vortex Laser Beam with Polarization Conversion
title_full_unstemmed	Focusing a Vortex Laser Beam with Polarization Conversion
title_sort	focusing a vortex laser beam with polarization conversion
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/fa3c5867636049b985cb834729b5a265
work_keys_str_mv	AT victorvkotlyar focusingavortexlaserbeamwithpolarizationconversion AT antongnalimov focusingavortexlaserbeamwithpolarizationconversion AT sergeysstafeev focusingavortexlaserbeamwithpolarizationconversion
_version_	1718410810931281920

Focusing a Vortex Laser Beam with Polarization Conversion

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