Manipulation of accelerating curved vortex beam modulated by inhomogeneous spiral phase
Institute of Modern Optics, Nankai University, 300350, Tianjin, China
2 Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, 300350, Tianjin, China
3 College of Precision Instrument and Optoelectronics Engineering, Tianjin University, 300072, Tianjin, China
4 Key Laboratory of Optoelectronics Information Technical Science, EMC, 300072, Tianjin, China
Accepted: 13 October 2022
Published online: 31 October 2022
Accelerating beam have been proved a series of characteristics, such as diffraction-free, self-healing and self-bent transmission. Here, we present a novel phase structure consisting of an inhomogeneous phase and a helical phase to produce accelerating curved vortex beam (ACVB), which can be used to deliver carriers along a particular curve. With the scalar diffraction theory, we derive and calculate the field intensity distribution of ACVB. In our experiment, the phase mask projected on spatial light modulator is used to generate ACVB, which is consistent with the corresponding simulation results. It is found that ACVB is similar to Airy beam in x-y plane and z direction, and still has self-accelerating property. Then, the experiment demonstrates the whole process of trapping particles under ACVB irradiation, and they are linearly arranged on the focal plane of ACVB. This study will facilitate optical micromanipulation and biophotonics research.
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