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Photonics
Volume 11
Issue 2
10.3390/photonics11020149
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Communication

Evolution of the Phase Singularity of an Orbital Angular Momentum Beam with an Astigmatism Phase

by
Chunhao Liang
1,2,
Cuiling Zheng
1,2,
Xinru Lian
1,2,
Qian Chen
1,2,
Yaru Gao
1,2,*,
Jinsong Liu
1,2,
Yangjian Cai
1,2 and
Jun Zeng
1,2,*
1
Shandong Provincial Engineering and Technical Center of Light Manipulation & Shandong Provincial Key Laboratory of Optics and Photonics Devices, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
2
Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250358, China
*
Authors to whom correspondence should be addressed.
Photonics 2024, 11(2), 149; https://doi.org/10.3390/photonics11020149
Submission received: 8 January 2024 / Revised: 25 January 2024 / Accepted: 1 February 2024 / Published: 5 February 2024
(This article belongs to the Special Issue Coherence Manipulation, Propagation and Applications of Vortex Beam)
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Abstract

In this study, we explore the impact of the astigmatism phase on the evolution of the phase singularity of an orbital angular momentum (OAM) beam propagating through free space. The results demonstrate that the high-order phase singularity dispersed into a cluster of individual unit phase singularities owing to the astigmatism phase. The number of singularities equaled the topological charge of the OAM beam. By adjusting the astigmatism phase, we could manipulate and control the evolution of the phase singularities, including their displacements and rotation angles. These findings offer significant prospects for customizing 3D vortex lines, optical topologies, and applications involving topological charge measurement, information encoding, and transfer.
Keywords: phase singularity; astigmatism phase; orbital angular momentum beam phase singularity; astigmatism phase; orbital angular momentum beam

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MDPI and ACS Style

Liang, C.; Zheng, C.; Lian, X.; Chen, Q.; Gao, Y.; Liu, J.; Cai, Y.; Zeng, J. Evolution of the Phase Singularity of an Orbital Angular Momentum Beam with an Astigmatism Phase. Photonics 2024, 11, 149. https://doi.org/10.3390/photonics11020149

AMA Style

Liang C, Zheng C, Lian X, Chen Q, Gao Y, Liu J, Cai Y, Zeng J. Evolution of the Phase Singularity of an Orbital Angular Momentum Beam with an Astigmatism Phase. Photonics. 2024; 11(2):149. https://doi.org/10.3390/photonics11020149

Chicago/Turabian Style

Liang, Chunhao, Cuiling Zheng, Xinru Lian, Qian Chen, Yaru Gao, Jinsong Liu, Yangjian Cai, and Jun Zeng. 2024. "Evolution of the Phase Singularity of an Orbital Angular Momentum Beam with an Astigmatism Phase" Photonics 11, no. 2: 149. https://doi.org/10.3390/photonics11020149

APA Style

Liang, C., Zheng, C., Lian, X., Chen, Q., Gao, Y., Liu, J., Cai, Y., & Zeng, J. (2024). Evolution of the Phase Singularity of an Orbital Angular Momentum Beam with an Astigmatism Phase. Photonics, 11(2), 149. https://doi.org/10.3390/photonics11020149

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