Cylindrical vector beam generation in multiple elliptical core fiber with gold wire

A new method to generate cylindrical vector beam carrying helical phase is proposed based on a multiple elliptical core fiber integrated with gold wire. Both the light field distributions in near- and far-field are considered. The simulation results show that the multiple core fiber filled with gold wire in the center can only support low-loss transmission for the analogous azimuthally polarized (AP) light field with discrete rotational symmetric profile in a broadband range, because the resonant coupling between the surface plasmon modes and the fiber core-guided supermodes. The far-field patterns for different number core are demonstrated to represent an effective AP beam. It also acts as an effective broadband transmission filter for azimuthal modes.