Efficient orbital angular momentum vortex beam generation by generalized coding metasurface

被引：0
|
作者：
Qiqi Zheng
Yongfeng Li
Yajuan Han
Maochang Feng
Yongqiang Pang
Jiafu Wang
Hua Ma
Shaobo Qu
Jieqiu Zhang
机构：
[1] Air Force Engineering University,Department of Basic Sciences
[2] Xidian University,School of Physics and Optoelectronic Engineering
来源：
Applied Physics A | 2019年 / 125卷
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摘要：
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.
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