title: Managing focal fields of vector beams with multiple polarization singularities.
abstract: We explore the tight focusing behavior of vector beams with multiple polarization singularities, and analyze the influences of the number, position, and topological charge of the singularities on the focal fields. It is found that the ellipticity of the local polarization states at the focal plane could be determined by the spatial distribution of the polarization singularities of the vector beam. When the spatial location and topological charge of singularities have even-fold rotation symmetry, the transverse fields at the focal plane are locally linearly polarized. Otherwise, the polarization state becomes a locally hybrid one. By appropriately arranging the distribution of the polarization singularities in the vector beam, the polarization distributions of the focal fields could be altered while the intensity maintains unchanged.
authors.forename: Lei
authors.initials: L
authors.lastname: Han
authors.forename: Sheng
authors.initials: S
authors.lastname: Liu
authors.forename: Peng
authors.initials: P
authors.lastname: Li
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang
authors.forename: Huachao
authors.initials: H
authors.lastname: Cheng
authors.forename: Xuetao
authors.initials: X
authors.lastname: Gan
authors.forename: Jianlin
authors.initials: J
authors.lastname: Zhao