title: Modified optical vortices for encoding topological charges with principal-sidelobe ring relationships.
abstract: We study modified optical vortices for encoding topological charges based on radius ratios between principal and the modified first sidelobe rings. The method is immune to harassments from alignment and phase matching between the beams and optical elements. Moreover, it is demonstrated that the radius ratios and their corresponding modulation parameters are independent to wavelength and size of the spiral phase mask.
authors.affiliation: Institute of Modern Optics, Key Laboratory of Optoelectronic Information Science and Technology, Ministry of Education of China, Nankai University, Tianjin, 300071, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.forename: Xing
authors.initials: X
authors.lastname: Zhao
authors.forename: Zhiliang
authors.initials: Z
authors.lastname: Fang
authors.forename: Siwei
authors.initials: S
authors.lastname: Zhu
authors.forename: X-C
authors.initials: XC
authors.lastname: Yuan