Chirality effect on the propagation characteristics of a double-half inverse Gaussian hollow beam
摘要
The propagation characteristics of a Double-Half Inverse Gaussian Hollow Beam (DHIGHB) in a chiral medium are investigated. An analytical expression describing the DHIGHB's evolution in the chiral medium is theoretically derived using the Huygens-Fresnel integral. The beam's propagation behavior is then illustrated and analyzed through numerical simulations. The obtained field can be deemed as a superposition of Gaussian terms and is visualized in the observation plane as an Airy spot for a given distance. The results demonstrate that the spreading behavior of the DHIGHB in a chiral medium is strongly influenced by both the chirality parameter and the initial beam waist. It is found that the central dark region becomes brighter as its radius enlarges when the propagation distance becomes greater. Furthermore, the left circularly polarized (LCP) wave, the right circularly polarized (RCP) wave and the interference between the two circularly polarized components generated from a linearly polarized beam in the chiral medium can lead to a more complex intensity distribution, thereby enhancing the structural richness of the resulting beam pattern. The study could contribute to the advancement of hollow beams in spectroscopy, bimolecular sensing, and the development of new materials for various optical devices.