Propagation of the odd-Pearcey Gauss beam in the uniaxial crystals with the Pockels effect

Abstract

In this paper, the propagation dynamics of an odd-Pearcey Gauss beam (OPGB) in uniaxial crystals along the optical axis governed by the Pockels effect is analytically and numerically investigated. In this case, the left-hand circularly polarized OPGB gives rise to the right-hand vortex component possessing a topological charge of 2. Results show that the focusing intensity, the focusing distance, the focal point size, the efficiency of the power exchange between these two contributions and the conversion between spin angular momentum (SAM) and orbit angular momentum (OAM) can be controlled by choosing an appropriate external electric field. Furthermore, the right-hand vortex component can be utilized to trap the nanoparticles whose refractive index is lower than that of the surroundings. The energy flow and the angular momentum of the OPGB are also studied. Particularly, with increasing the ratio of the extraordinary index to the ordinary index in a uniaxial medium, both two contributions perform bifocusing behavior.