title: Cylindrical vector beam generation in fiber with mode selectivity and wavelength tunability over broadband by acoustic flexural wave.
abstract: Theoretical analysis and experimental demonstration are presented for the generation of cylindrical vector beams (CVBs) via mode conversion in fiber from HE11mode to TM01and TE01modes, which have radial and azimuthal polarizations, respectively. Intermodal coupling is caused by an acoustic flexural wave applied on the fiber, whereas polarization control is necessary for the mode conversion, i.e. HE11x→TM01and HE11y→TE01for acoustic vibration along the x-axis. The frequency of the RF driving signal for actuating the acoustic wave is determined by the phase matching condition that the period of acoustic wave equals the beatlength of two coupled modes. With phase matching condition tunability, this approach can be used to generate different types of CVBs at the same wavelength over a broadband. Experimental demonstration was done in the visible and communication bands.
authors.forename: Wending
authors.initials: W
authors.lastname: Zhang
authors.forename: Ligang
authors.initials: L
authors.lastname: Huang
authors.forename: Keyan
authors.initials: K
authors.lastname: Wei
authors.forename: Peng
authors.initials: P
authors.lastname: Li
authors.forename: Biqiang
authors.initials: B
authors.lastname: Jiang
authors.forename: Dong
authors.initials: D
authors.lastname: Mao
authors.forename: Feng
authors.initials: F
authors.lastname: Gao
authors.forename: Ting
authors.initials: T
authors.lastname: Mei
authors.forename: Guoquan
authors.initials: G
authors.lastname: Zhang
authors.forename: Jianlin
authors.initials: J
authors.lastname: Zhao