Ways to achieve efficient non-local vortex beam generation

Based on the insights into the phenomenon of bound states in the continuum, a novel approach utilizing the momentum-space polarization morphologies of periodic structures to generate vortex beams (VBs) has been proposed. Such periodic structures modulate beams in a nonlocal way and require no precis...

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Autores principales:	Liu Wenzhe, Shi Lei, Zi Jian, Chan Che Ting
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	bound state in the continuum kerker effect non-local photonic crystal polarization singularity vortex beam Physics QC1-999
Acceso en línea:	https://doaj.org/article/21a3b62f8c9f441fb21da94edcf7739b
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id	oai:doaj.org-article:21a3b62f8c9f441fb21da94edcf7739b
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spelling	oai:doaj.org-article:21a3b62f8c9f441fb21da94edcf7739b2021-12-05T14:10:56ZWays to achieve efficient non-local vortex beam generation2192-861410.1515/nanoph-2021-0342https://doaj.org/article/21a3b62f8c9f441fb21da94edcf7739b2021-09-01T00:00:00Zhttps://doi.org/10.1515/nanoph-2021-0342https://doaj.org/toc/2192-8614Based on the insights into the phenomenon of bound states in the continuum, a novel approach utilizing the momentum-space polarization morphologies of periodic structures to generate vortex beams (VBs) has been proposed. Such periodic structures modulate beams in a nonlocal way and require no precise alignment. However, the efficiency of such an approach has not been analyzed in detail, and the efficiency in previous realizations is far from optimized. Here, we analyze the factors affecting the efficiency of nonlocal VB generation. We show that the maximal efficiency cannot exceed 25% if the periodic structure carries only singlet resonances. To go beyond this limit, we propose two approaches to improve efficiency. We theoretically analyze the mechanisms and verify the approaches by full-wave simulations. Both of the approaches serve to improve the generation efficiency by several folds.Liu WenzheShi LeiZi JianChan Che TingDe Gruyterarticlebound state in the continuumkerker effectnon-localphotonic crystalpolarization singularityvortex beamPhysicsQC1-999ENNanophotonics, Vol 10, Iss 17, Pp 4297-4304 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	bound state in the continuum kerker effect non-local photonic crystal polarization singularity vortex beam Physics QC1-999
spellingShingle	bound state in the continuum kerker effect non-local photonic crystal polarization singularity vortex beam Physics QC1-999 Liu Wenzhe Shi Lei Zi Jian Chan Che Ting Ways to achieve efficient non-local vortex beam generation
description	Based on the insights into the phenomenon of bound states in the continuum, a novel approach utilizing the momentum-space polarization morphologies of periodic structures to generate vortex beams (VBs) has been proposed. Such periodic structures modulate beams in a nonlocal way and require no precise alignment. However, the efficiency of such an approach has not been analyzed in detail, and the efficiency in previous realizations is far from optimized. Here, we analyze the factors affecting the efficiency of nonlocal VB generation. We show that the maximal efficiency cannot exceed 25% if the periodic structure carries only singlet resonances. To go beyond this limit, we propose two approaches to improve efficiency. We theoretically analyze the mechanisms and verify the approaches by full-wave simulations. Both of the approaches serve to improve the generation efficiency by several folds.
format	article
author	Liu Wenzhe Shi Lei Zi Jian Chan Che Ting
author_facet	Liu Wenzhe Shi Lei Zi Jian Chan Che Ting
author_sort	Liu Wenzhe
title	Ways to achieve efficient non-local vortex beam generation
title_short	Ways to achieve efficient non-local vortex beam generation
title_full	Ways to achieve efficient non-local vortex beam generation
title_fullStr	Ways to achieve efficient non-local vortex beam generation
title_full_unstemmed	Ways to achieve efficient non-local vortex beam generation
title_sort	ways to achieve efficient non-local vortex beam generation
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/21a3b62f8c9f441fb21da94edcf7739b
work_keys_str_mv	AT liuwenzhe waystoachieveefficientnonlocalvortexbeamgeneration AT shilei waystoachieveefficientnonlocalvortexbeamgeneration AT zijian waystoachieveefficientnonlocalvortexbeamgeneration AT chancheting waystoachieveefficientnonlocalvortexbeamgeneration
_version_	1718371589338169344

Ways to achieve efficient non-local vortex beam generation

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