Paraxial propagation of cosh-Airy vortex beams in chiral medium
Xiao-Jin Yang(杨小锦)1, Zhen-Sen Wu(吴振森)1, Tan Qu(屈檀)2
1 School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China; 2 School of Electronic Engineering, Xidian University, Xi'an 710071, China
Abstract Propagation dynamics of the cosh-Airy vortex (CAiV) beams in a chiral medium is investigated analytically with Huygens-Fresnel diffraction integral formula. The results show that the CAiV beams are split into the left circularly polarized vortex (LCPV) beams and the right circularly polarized vortex (RCPV) beams with different propagation trajectories in the chiral medium. We mainly investigate the effect of the cosh parameter on the propagation process of the CAiV beams. The propagation characteristics, including intensity distribution, propagation trajectory, peak intensity, main lobe's intensity, Poynting vector, and angular momentum are discussed in detail. We find that the cosh parameter affects the intensity distribution of the CAiV beams but not its propagation trajectory. As the cosh parameter increases, the distribution areas of the LCPV and RCPV beams become wider, and the side lobe's intensity and peak intensity become larger. Besides, the main lobe's intensity of the LCPV and RCPV beams increase with the increase of the cosh parameter at a farther propagation distance, which is confirmed by the variation trend of the Poynting vector. It is significant that we can vary the cosh parameter to control the intensity distribution, main lobe's intensity, and peak intensity of the CAiV beams without changing the propagation trajectory. Our results may provide some support for applications of the CAiV beams in optical micromanipulation.
(Beam trapping, self-focusing and defocusing; self-phase modulation)
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61601355 and 61571355), the China Postdoctoral Science Foundation (Grant No. 2016M602770), the Natural Science Foundation of Shaanxi Province, China (Grant Nos. 2018JM6018 and 2019JQ-405), the Postdoctoral Science Foundation of Shaanxi Province, China, and the Fundamental Research Funds for the Central Universities, China.
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