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Astigmatic hybrid SU(2) vector vortex beams: towards versatile structures in longitudinally variant polarized optics

Astigmatic hybrid SU(2) vector vortex beams: towards versatile structures in longitudinally variant polarized optics
Astigmatic hybrid SU(2) vector vortex beams: towards versatile structures in longitudinally variant polarized optics
Structured light with more controllable degrees-of-freedom (DoFs) is an exciting topic with versatile applications. In contrast to conventional vector vortex beams (VVBs) with two DoFs of orbital angular momentum (OAM) and polarization, a hybrid ray-wave structure was recently proposed [Optica 7, 820 (2020)], which simultaneously manifests multiple DoFs such as ray trajectory, coherent state phase, trajectory combination, besides OAM and polarization. Here we further generalize this exotic structure as the astigmatic hybrid VVB by hatching a new DoF of astigmatic degree. Importantly, the transverse topology varies with propagation, e.g. a linearly distributed hybrid trajectory pattern can topologically evolve to a circularly polygonal star shape, where the number of singularity changes from zero to multiple in a single beam. The propagation-dependent evolution can be easily controlled by the astigmatic degree, including as a vector vortex state such that different astigmatic trajectories have different polarizations. We experimentally generate such beams from a simple laser with a special astigmatic conversion by combined spherical and cylindrical lenses, and the results agree well with our theoretical simulation. With our new structured light, the propagation-multiplexing multi-DoF patterns can be controlled in a single beam, which can largely extend related applications such as high-dimensional large-capacity optical communication, laser machining, and particle trapping.
1094-4087
315-329
Wang, Zhaoyang
90bcc7c2-e3c5-4881-9be1-3d2e13271e14
Shen, Yijie
42410cf7-8adb-4de6-9175-a1332245c368
Naidoo, Darryl
66678f54-6fa9-4e6f-93b6-13d45fba5dbf
Fu, Xing
b93bc44e-4b8c-4e94-9b40-ad53938c59d6
Forbes, Andrew
e745cc06-a297-4fe8-9597-edf694c50c81
Wang, Zhaoyang
90bcc7c2-e3c5-4881-9be1-3d2e13271e14
Shen, Yijie
42410cf7-8adb-4de6-9175-a1332245c368
Naidoo, Darryl
66678f54-6fa9-4e6f-93b6-13d45fba5dbf
Fu, Xing
b93bc44e-4b8c-4e94-9b40-ad53938c59d6
Forbes, Andrew
e745cc06-a297-4fe8-9597-edf694c50c81

Wang, Zhaoyang, Shen, Yijie, Naidoo, Darryl, Fu, Xing and Forbes, Andrew (2020) Astigmatic hybrid SU(2) vector vortex beams: towards versatile structures in longitudinally variant polarized optics. Optics Express, 29 (1), 315-329. (doi:10.1364/OE.414674).

Record type: Article

Abstract

Structured light with more controllable degrees-of-freedom (DoFs) is an exciting topic with versatile applications. In contrast to conventional vector vortex beams (VVBs) with two DoFs of orbital angular momentum (OAM) and polarization, a hybrid ray-wave structure was recently proposed [Optica 7, 820 (2020)], which simultaneously manifests multiple DoFs such as ray trajectory, coherent state phase, trajectory combination, besides OAM and polarization. Here we further generalize this exotic structure as the astigmatic hybrid VVB by hatching a new DoF of astigmatic degree. Importantly, the transverse topology varies with propagation, e.g. a linearly distributed hybrid trajectory pattern can topologically evolve to a circularly polygonal star shape, where the number of singularity changes from zero to multiple in a single beam. The propagation-dependent evolution can be easily controlled by the astigmatic degree, including as a vector vortex state such that different astigmatic trajectories have different polarizations. We experimentally generate such beams from a simple laser with a special astigmatic conversion by combined spherical and cylindrical lenses, and the results agree well with our theoretical simulation. With our new structured light, the propagation-multiplexing multi-DoF patterns can be controlled in a single beam, which can largely extend related applications such as high-dimensional large-capacity optical communication, laser machining, and particle trapping.

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Shen-2021-Astigmatic-OPE - Accepted Manuscript
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Accepted/In Press date: 17 December 2020
Published date: 22 December 2020

Identifiers

Local EPrints ID: 449726
URI: http://eprints.soton.ac.uk/id/eprint/449726
ISSN: 1094-4087
PURE UUID: 3fd5d422-32da-48fb-aa0b-2727f34531da

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Date deposited: 14 Jun 2021 16:31
Last modified: 21 Oct 2021 16:51

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Contributors

Author: Zhaoyang Wang
Author: Yijie Shen
Author: Darryl Naidoo
Author: Xing Fu
Author: Andrew Forbes

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