Open AccessDual-band vortex beam generation with different OAM modes using single-layer metasurface
Author(s) -
Ji Chen,
Jun Song,
Cheng Huang,
Xiaoyu Wu,
Xiangang Luo
Publication year - 2019
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.27.000034
Subject(s) - optics , physics , topological quantum number , optical vortex , geometric phase , angular momentum , phase (matter) , beam (structure) , vortex , polarization (electrochemistry) , phase modulation , circular polarization , light beam , phase noise , chemistry , quantum mechanics , thermodynamics , microstrip
Recently, considerable attention has been focused on orbital angular momentum (OAM) vortex wave, owing to its prospect of increasing communication capacity. Here, a single-layer metasurface is proposed to realize vortex beams with different OAM modes and polarizations carried at two distinctive bands. Both the resonant and geometric (Pancharatnam-Berry) phase cells are adopted to construct this metasurface for generating the desired phase profile, and each type of phase modulation cell can independently control the vortex beam at different frequencies. When a linearly-polarized wave is incident onto our metasurface, the resonant phase cells with spiral phase distribution can achieve OAM beam with topological charge of + 1 at 5.2 GHz. And under illumination of left-handed circular polarized (LHCP) wave, the rotated geometric phase cells assist the metasurface to generate the deflected OAM beam with topological charge of + 2 at 10.5~12 GHz. Both simulated and experimental results demonstrate good performance of the proposed single-layer metasurface at the above two frequency bands.