title: Free-space propagation of guided optical vortices excited in an annular core fiber.
abstract: The analytical expression for the propagation of guided optical vortices through free space is derived and used to study the dynamic evolution of guided optical vortices after passing through the free space, and the dependence of guided optical vortices on the control parameters where the effect of propagation distance is stressed. It is shown that the motion, pair creation and annihilation of guided optical vortices may take place. In particular, the creation and annihilation of a pair of guided optical vortices do not take place by varying fiber length.
authors.affiliation: State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China.
authors.forename: Hongwei
authors.initials: H
authors.lastname: Yan
authors.forename: Entao
authors.initials: E
authors.lastname: Zhang
authors.forename: Baoyin
authors.initials: B
authors.lastname: Zhao
authors.forename: Kailiang
authors.initials: K
authors.lastname: Duan