Fusion of fractional vortex pairs and their transition to integer vortex controlled by optical power

doi:10.1088/1674-1056/adb8b9

中国物理B ›› 2025, Vol. 34 ›› Issue (5): 54202-054202.doi: 10.1088/1674-1056/adb8b9

Fusion of fractional vortex pairs and their transition to integer vortex controlled by optical power

Chunzhi Sun(孙春志)¹, Xiangwei Chen(陈向炜)^1,†, Huizhong Xu², and Guo Liang(梁果)^1,‡

1 Henan International Joint Laboratory of Optical Information Transmission and Application, Shangqiu Normal University, Shangqiu 476000, China;
2 Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132, USA

收稿日期:2024-11-23 修回日期:2025-01-19 接受日期:2025-02-21 出版日期:2025-05-15 发布日期:2025-04-24
通讯作者: Xiangwei Chen, Guo Liang E-mail:chenxiangwei@sqnu.edu.cn;liangguo0916@163.com
基金资助:
Project supported by the International Scientific and Technological Cooperation Projects of Henan Province, China (Grant No. 242102520010), the Natural Science Foundation of Henan Province, China (Grant No. 252300421307), and the Training Program for Young Backbone Teachers of Higher Education Institutions in Henan Province, China (Grant No. 2023GGJS130).

Fusion of fractional vortex pairs and their transition to integer vortex controlled by optical power

Chunzhi Sun(孙春志)¹, Xiangwei Chen(陈向炜)^1,†, Huizhong Xu², and Guo Liang(梁果)^1,‡

1 Henan International Joint Laboratory of Optical Information Transmission and Application, Shangqiu Normal University, Shangqiu 476000, China;
2 Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132, USA

Received:2024-11-23 Revised:2025-01-19 Accepted:2025-02-21 Online:2025-05-15 Published:2025-04-24
Contact: Xiangwei Chen, Guo Liang E-mail:chenxiangwei@sqnu.edu.cn;liangguo0916@163.com
Supported by:
Project supported by the International Scientific and Technological Cooperation Projects of Henan Province, China (Grant No. 242102520010), the Natural Science Foundation of Henan Province, China (Grant No. 252300421307), and the Training Program for Young Backbone Teachers of Higher Education Institutions in Henan Province, China (Grant No. 2023GGJS130).

摘要/Abstract

摘要： The evolution of fractional vortex pairs in free space and nonlocal nonlinear media is studied. In free space, the off-axis fractional vortex pairs of the-same-sign topological charge (TC) will be merged to one integer vortex at the beam center, which is drastically different from the dynamics of integer vortex pairs. In nonlocal nonlinear media, the conversion between the fractional vortex pair and the conventional integer vortex can be readily achieved by only tuning the input optical power. Therefore our approach provides a convenient way to control the number of vortices and thus the number of optical tweezers by adjusting the input optical power. These results may find potential applications in optical manipulation of particles.

关键词: vortex beams, orbital angular momentum, optical manipulation

Abstract: The evolution of fractional vortex pairs in free space and nonlocal nonlinear media is studied. In free space, the off-axis fractional vortex pairs of the-same-sign topological charge (TC) will be merged to one integer vortex at the beam center, which is drastically different from the dynamics of integer vortex pairs. In nonlocal nonlinear media, the conversion between the fractional vortex pair and the conventional integer vortex can be readily achieved by only tuning the input optical power. Therefore our approach provides a convenient way to control the number of vortices and thus the number of optical tweezers by adjusting the input optical power. These results may find potential applications in optical manipulation of particles.

Key words: vortex beams, orbital angular momentum, optical manipulation

中图分类号: (Wave optics)

42.25.-p

42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation)

Chunzhi Sun(孙春志), Xiangwei Chen(陈向炜), Huizhong Xu, and Guo Liang(梁果). Fusion of fractional vortex pairs and their transition to integer vortex controlled by optical power[J]. 中国物理B, 2025, 34(5): 54202-054202.

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Fusion of fractional vortex pairs and their transition to integer vortex controlled by optical power

Fusion of fractional vortex pairs and their transition to integer vortex controlled by optical power

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