Propagation of quasi-diffraction-free lommel-airy vortex wavepackets in chiral media

Abstract

Lommel beams have significant applications in optical communication and optical manipulation due to the changeable symmetry of transverse intensity distribution and constantly varying orbital angular momentum. In this paper, a novel quasi-diffraction-free Lommel-Airy vortex (LAiV) wavepackets is proposed, and spatiotemporal dynamics of the LAiV wavepackets propagating in chiral media are investigated. Results indicate that several variables such as topological charge , group velocity , asymmetry factor , and chiral parameter could be used to regulate the profiles of the 3D spatiotemporal vortex rings. Particularly, the spatiotemporal propagation trajectories and intensity patterns of the LAiV wavepackets could be manipulated by altering the asymmetry factor and the chiral parameter . These results would deepen the understanding of the spatiotemporal propagation properties of the LAiV wavepackets and are expected to promote the development of the novel optical communications in chiral media.

The spiral phase spectrum of the composite power Gaussian vortex beam in plasma sheath turbulence

“…Meanwhile, it can be observed from figure 2(a) and figure 2(b) that the distribution of the spiral phase spectrum is identical in PST scenarios with anisotropic parameters whether ξ x = 1, ξ y = 2 or ξ x = 2, ξ y = 1. That is, PST scenarios with symmetric anisotropic parameters exhibit the same effect on beam propagation, benefiting from the equivalence of ξ x and ξ y embodied on equation (11), which can also be revealed by comparing figure 2(c) and figure 2(d). On the other hand, in the case of larger anisotropic parameters represented by figure 2(c) and figure 2(d), it is obviously observed that the detection probabilities of OAM states +2 and −2 are notably higher than those of the adjacent ones, and the detection probability of +2 is significantly larger than that of -2.…”

“…In particular, a higher degree of anisotropy of PST brings about a reduced effect on the beam propagation. This is because increasing either ξ x or ξ y can effectively lead to a reduction in ρ(z) according to equation (11), which means turbulence intensity and ultimately reduces the impact of turbulent vortices on the beam. Meanwhile, it can be observed from figure 2(a) and figure 2(b) that the distribution of the spiral phase spectrum is identical in PST scenarios with anisotropic parameters whether ξ x = 1, ξ y = 2 or ξ x = 2, ξ y = 1.…”

“…In 1992, Allen et al demonstrated that each photon of the Laguerre-Gaussian(LG) vortex beam carries orbital angular momentum(OAM), which can provide an additional degree of freedom for information multiplexing due to its orthogonality and completeness. This sparked widespread interest of researchers in the vortex beams carrying OAM together with their transmission properties through turbulent media [6][7][8][9][10][11][12]. The correlated investigations indicate that utilizing vortex beam as source beam can effectively mitigate wavefront distortion and reduce turbulent interference.…”