Open AccessCylindrical vector beam generation in fiber with mode selectivity and wavelength tunability over broadband by acoustic flexural wave
Author(s) -
Wending Zhang,
Ligang Huang,
Keyan Wei,
Peng Li,
Biqiang Jiang,
Dong Mao,
Feng Gao,
Ting Mei,
Guoquan Zhang,
Jianlin Zhao
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.010376
Subject(s) - optics , azimuth , broadband , wavelength , acoustics , physics , polarization (electrochemistry) , materials science , chemistry
Theoretical analysis and experimental demonstration are presented for the generation of cylindrical vector beams (CVBs) via mode conversion in fiber from HE 11 mode to TM 01 and TE 01 modes, 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→TM 01 and HE11y→TE 01 for 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.