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Abstract
In this paper, the vector vortex field of a tightly focusing system with a high numerical aperture is adjusted, and a nano-scale controllable dual-light vortex is obtained. At the same time, the topological charge $m$, parameter $\beta$, and phase parameter ν at the focal plane are changed by numerical simulation, and the focusing characteristics of the nano-scale controllable dual-light vortex are deeply studied, including the movement of the dual-light vortex and the energy flow. We also study the transmission characteristics in the $z$ axis, and the results are consistent with the focusing characteristics. To analyze the manipulation ability of the two-light vortex, the corresponding gradient force distribution is calculated. At present, most research on vortex beams focuses on their topological charges on light intensity and beam shaping. There is a lack of in-depth research on nano-scale vortex beam regulation of tight focus systems under high numerical apertures. This paper innovatively modulates the nano-scale controllable dual-light vortex, which has extremely important application significance in the fields of optical communication, optical micromanipulation (high-precision manipulation), and rotation detection.
© 2022 Optica Publishing Group
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