Suspended Metasurface for Broadband High-Efficiency Vortex Beam Generation

Materials

Zhuo Xu¹  Anxue Zhang²  Jianjia Yi²  Haiwen Liu³  Luyi Wang³  Hongyu Shi³  Liang Dong⁴ 

[1] Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China;School of Information and Communications Engineering, Xi’an Jiaotong University, Xi’an 710049, China;Shaanxi Key Laboratory of Deep Space Exploration Intelligent Information Technology, Xi’an Jiaotong University, Xi’an 710049, China;Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China;

关键词: suspended metasurface;    vortex beam;    orbital angular momentum;    broadband;    high-efficiency;   

DOI  :  10.3390/ma15030707

来源: DOAJ

【 摘 要 】

Electromagnetic (EM) waves carrying orbital angular momentum (OAM) exhibit phase vortex and amplitude singularity. Broadband OAM generation with high efficiency is highly desired with suggested applications such as broadband imaging and communications. In this paper, suspended metasurface structure achieving low-Q factor is proposed to realize broadband phase control and excellent reflection efficiency. Broadband vortex beam generation with OAM order of 1 and 2 are realized using the proposed suspended structure. Furthermore, by analyzing different metasurface aperture phase distribution schemes, the efficiency of the OAM generator is maximally achieved. The designs are validated by simulation and measurement. The proposed OAM generators work across 4–10 GHz with efficiency higher than 82%. This design provides a route to broadband metasurface realization and high efficiency OAM generation.

【 授权许可】

Unknown