Propagation properties and radiation forces of the chirped Pearcey Gaussian vortex beam in a medium with a parabolic refractive index

• Published in: Communications in nonlinear science & numerical simulation 2021-03, Vol.94, p.105557, Article 105557
• Main Authors: Lin, Zejia, Wu, You, Qiu, Huixin, Fu, Xinming, Chen, Kaihui, Deng, Dongmei
• Format: Article
• Language: English
• Subjects: Chirped Pearcey Gaussian vortex beam; Electron beams; Fourier optics; Fourier transforms; Gaussian beams (optics); Mathematical models; Parabolic refractive index; Parameter identification; Propagation; Radiation forces; Refractivity; Vortices
• ISSN: 1007-5704; 1878-7274
• DOI: 10.1016/j.cnsns.2020.105557

•An analytical expression of the second order chirped Pearcey Gaussian vortex beam (CPGVB) in a medium with a parabolic refractive index is derived.•Expectedly, the CPGVB performs periodically automatic Fourier transform in the specific positions, but unexpectedly the off-axis autofocusing position can be generated and controlled without changing the laser incident angle.•The repercussions of the parameters on the propagation properties are demonstrated.•Note that some trapping positions form in the beam-propagation direction if the size of the particle is small enough. In our study, an analytical expression of the second order chirped Pearcey Gaussian vortex beam (CPGVB) in a medium with a parabolic refractive index is derived. We demonstrate its propagation behaviors as well as the effects of the parameters on the propagation properties. Expectedly, the CPGVB performs periodically automatic Fourier transform in the specific positions, but unexpectedly the off-axis autofocusing position can be generated and controlled without changing the laser incident angle. Furthermore, we investigate the radiation forces of the CPGVB, and thus notice that trapping positions form in the beam-propagation direction.