Transverse Focal Shift in Vortex Beams

The transverse focal shift (TFS) is a phenomenon that the maximum of a focused field does not occur at the geometrical focus, but is moved a short distance transversely in the focal plane. In this paper, the TFS of vortex beams in a high numerical aperture system is investigated. Four typical types...

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Auteurs principaux:	Xinying Zhao, Xiaoyan Pang, Jingcheng Zhang, Guobin Wan
Format:	article
Langue:	EN
Publié:	IEEE 2018
Sujets:	Singular optics diffraction theory optical vortex transverse focal shift Applied optics. Photonics TA1501-1820 Optics. Light QC350-467
Accès en ligne:	https://doaj.org/article/99bea7d3e68c413793a2a8d3016c7c43
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spelling	oai:doaj.org-article:99bea7d3e68c413793a2a8d3016c7c432021-11-20T00:00:07ZTransverse Focal Shift in Vortex Beams1943-065510.1109/JPHOT.2018.2795597https://doaj.org/article/99bea7d3e68c413793a2a8d3016c7c432018-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/8264749/https://doaj.org/toc/1943-0655The transverse focal shift (TFS) is a phenomenon that the maximum of a focused field does not occur at the geometrical focus, but is moved a short distance transversely in the focal plane. In this paper, the TFS of vortex beams in a high numerical aperture system is investigated. Four typical types of incident vortex beams are selected and the intensity distributions and the vortices behaviors in the focal region are discussed analytically and numerically. It is found that there are three main parameters, the topological charge, the initial positions of the vortices, and the semiaperture angle influencing the TFS in different ways, and the TFS even can be observed when the vortices annihilate in the focal plane. Our results also show that the intensity maximum can move from the <inline-formula><tex-math notation="LaTeX">$y$</tex-math></inline-formula>-axis, <inline-formula> <tex-math notation="LaTeX">$x$</tex-math></inline-formula>-axis to the geometrical focus, or move from <inline-formula> <tex-math notation="LaTeX">$+y$</tex-math></inline-formula>-axis to <inline-formula><tex-math notation="LaTeX">$-y$ </tex-math></inline-formula>-axis in different cases, which may have implications in optical trapping.Xinying ZhaoXiaoyan PangJingcheng ZhangGuobin WanIEEEarticleSingular opticsdiffraction theoryoptical vortextransverse focal shiftApplied optics. PhotonicsTA1501-1820Optics. LightQC350-467ENIEEE Photonics Journal, Vol 10, Iss 1, Pp 1-17 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Singular optics diffraction theory optical vortex transverse focal shift Applied optics. Photonics TA1501-1820 Optics. Light QC350-467
spellingShingle	Singular optics diffraction theory optical vortex transverse focal shift Applied optics. Photonics TA1501-1820 Optics. Light QC350-467 Xinying Zhao Xiaoyan Pang Jingcheng Zhang Guobin Wan Transverse Focal Shift in Vortex Beams
description	The transverse focal shift (TFS) is a phenomenon that the maximum of a focused field does not occur at the geometrical focus, but is moved a short distance transversely in the focal plane. In this paper, the TFS of vortex beams in a high numerical aperture system is investigated. Four typical types of incident vortex beams are selected and the intensity distributions and the vortices behaviors in the focal region are discussed analytically and numerically. It is found that there are three main parameters, the topological charge, the initial positions of the vortices, and the semiaperture angle influencing the TFS in different ways, and the TFS even can be observed when the vortices annihilate in the focal plane. Our results also show that the intensity maximum can move from the <inline-formula><tex-math notation="LaTeX">$y$</tex-math></inline-formula>-axis, <inline-formula> <tex-math notation="LaTeX">$x$</tex-math></inline-formula>-axis to the geometrical focus, or move from <inline-formula> <tex-math notation="LaTeX">$+y$</tex-math></inline-formula>-axis to <inline-formula><tex-math notation="LaTeX">$-y$ </tex-math></inline-formula>-axis in different cases, which may have implications in optical trapping.
format	article
author	Xinying Zhao Xiaoyan Pang Jingcheng Zhang Guobin Wan
author_facet	Xinying Zhao Xiaoyan Pang Jingcheng Zhang Guobin Wan
author_sort	Xinying Zhao
title	Transverse Focal Shift in Vortex Beams
title_short	Transverse Focal Shift in Vortex Beams
title_full	Transverse Focal Shift in Vortex Beams
title_fullStr	Transverse Focal Shift in Vortex Beams
title_full_unstemmed	Transverse Focal Shift in Vortex Beams
title_sort	transverse focal shift in vortex beams
publisher	IEEE
publishDate	2018
url	https://doaj.org/article/99bea7d3e68c413793a2a8d3016c7c43
work_keys_str_mv	AT xinyingzhao transversefocalshiftinvortexbeams AT xiaoyanpang transversefocalshiftinvortexbeams AT jingchengzhang transversefocalshiftinvortexbeams AT guobinwan transversefocalshiftinvortexbeams
_version_	1718419851327832064

Transverse Focal Shift in Vortex Beams

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