Efficient orbital angular momentum vortex beam generation by generalized coding metasurface
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A method to efficiently generate orbital angular momentum (OAM) vortex beam is proposed by introducing generalized coding metasurface (CM). Firstly, a linearly polarized (LP) cross-polarization transmission unit cell is employed as the coding element. Then, the generalized CM composed of sectorial coding elements can be considered as a bridge linking mode number of OAM and beam divergence with coding sequences. Different mode numbers OAM is generated by CMs with different coding sequences under y-polarized wave normal incidence. Both theoretical analysis and simulated results reveal that the proposed CM can achieve flexible control of the OAM vortex beam.
The authors are grateful to the supports from the National Natural Science Foundation of China under Grant Nos. 61501503, 61471388, and 61331005, and the Natural Science Foundation of Shaanxi Province under Grant No. 2017JM6005.