title: Multifocus with small size, uniform intensity, and nearly circular symmetry.
abstract: We investigate in detail the focusing properties of the composite vector beam (CVB) composed of two orthogonally linearly polarized beams with inhomogeneous polarization modulation. By optimizing the modulation factor, a multifocus with excellent quality is obtained, where the sizes of each focus are fairly smaller than that of the focusing spot of a radially polarized beam, the uniformity in the intensity of the focal spots is as high as 1, and the distributions of each focal spot have nearly circular symmetry. In order to decrease the power loss of the incident beam, the CVB formed by an annular beam is demonstrated as the substitute for the optimized CVB formed by a Gaussian beam. This work is important for high-resolution and high-speed imaging in biology and micro-nanofabrication.
authors.affiliation: Shanghai Key Laboratory of Modern Optics System, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China. hmguo@usst.edu.cn
authors.forename: Hanming
authors.initials: H
authors.lastname: Guo
authors.forename: Xiangmei
authors.initials: X
authors.lastname: Dong
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Weng
authors.forename: Guorong
authors.initials: G
authors.lastname: Sui
authors.forename: Ning
authors.initials: N
authors.lastname: Yang
authors.forename: Songlin
authors.initials: S
authors.lastname: Zhuang
mesh_terms: D008027:Light; D057054:Molecular Imaging; D055620:Optical Phenomena