title: Vector-vortex Bessel-Gauss beams and their tightly focusing properties.
abstract: We demonstrate that the amplitude of vector-vortex beams has a Bessel-Gauss (BG) distribution through a rigorous vector electromagnetic analysis. We also investigate the intensity profiles in the focal plane of vector-vortex beams that are focused by a high numerical-aperture lens obeying the Helmholtz condition. Although the intensity of a vector-vortex BG beam with a topological charge n=1 is nonzero along the axis in the focal plane, the beams with n≠1 show discrete multiple spots which can be useful for optical trapping.
authors.affiliation: Key Laboratory of Quantum Information, China Academy of Science, Hefei, Anhui, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Huang
authors.forename: Peng
authors.initials: P
authors.lastname: Shi
authors.forename: G W
authors.initials: GW
authors.lastname: Cao
authors.forename: Ke
authors.initials: K
authors.lastname: Li
authors.forename: X B
authors.initials: XB
authors.lastname: Zhang
authors.forename: Y P
authors.initials: YP
authors.lastname: Li