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
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.
(Beam characteristics: profile, intensity, and power; spatial pattern formation)
Fund: 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).
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 2025 Chin. Phys. B 34 054202
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