Abstract
We propose and demonstrate a novel vortex Airy beam which is a superposition of an Airy beam and its laterally sheared beam with a π/2 phase shift. This new-type of vortex Airy beam exhibits stable propagation dynamics, wherein its singular point closely follows its main lobe, unlike conventional vortex Airy beams. Notably, the orbital angular mode purity of this new vortex Airy beam is up to 10% better than that of a conventional vortex Airy beam. We anticipate that this new type of vortex Airy beam, which combines the characteristics of an optical vortex and a diffraction-free Airy beam, will facilitate new directions in applications such as microscopy, material processing and nonlinear optics.
Highlights
An Airy beam is a class of diffraction-free beams which include Bessel and Mathieu beams [1]
The propagation dynamics of the conventional vortex Airy beam (Fig. 6(a)) and the new-type vortex Airy beam (Fig. 6(b)) clearly agree well with the numerical simulations shown in Figs. 2(c) and 2(d), respectively
The main vortex lobe of the finite-energy conventional vortex Airy beam deformed at z = 1 and divided into two spots at z = 2, which as mentioned is attributed to the main singular point deviating from the parabolic trajectory
Summary
An Airy beam is a class of diffraction-free beams which include Bessel and Mathieu beams [1]. It is difficult to make the singular point follow the parabolic course of the Airy beam and as such, this has been seen as a barrier to their use in practical applications One such promising application is stimulated emission depletion selective plane illumination microscopy (STED-SPIM) [18, 19, 20], which uses the combination of an Airy beam for the excitation beam and a vortex Airy beam for the STED beam. This next-generation of STED microscopy would yield fast and high-resolution imaging with an unparalleled field of view In this manuscript, we propose a new vortex Airy beam, whose singular point follows its main lobe. This is followed by discussion and conclusions of our work
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