Reflective triple-band line-to-circular polarization conversion based on diamond-shaped graphene metasurface

被引：11
作者：
Liu, Yongqi [1 ,2 ]
Qiao, Qi [1 ,2 ]
Fu, Yu [1 ,2 ]
Zhou, Xinwei [1 ,2 ]
Li, Runjia [1 ,2 ]
Lu, Mengjia [3 ]
Wang, Yueke [1 ,2 ]
机构：
[1] Jiangnan Univ, Opt Informat Sci & Technol Dept, Wuxi 214122, Jiangsu, Peoples R China
[2] Jiangnan Univ, Optoelect Engn & Technol Res Ctr, Wuxi 214122, Jiangsu, Peoples R China
[3] Southeast Univ, Adv Photon Ctr, Nanjing 210096, Jiangsu, Peoples R China
来源：
OPTICAL MATERIALS | 2021年 / 114卷
基金：
中国国家自然科学基金;
关键词：
MULTIBAND;
D O I：
10.1016/j.optmat.2021.110984
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this paper, we present a triple-band line-to-circular (LTC) polarization converter based on graphene-integrated metasurface, which is composed of graphene diamond patches. Finite element method results show that there are two LTC polarizations bands with 0.36 and 0.44 THz 1 dB bandwidth, which can achieve line-to-right-circular (LTRC) conversion; there is one LTC polarization band with 2.23 THz 1 dB bandwidth, which can achieve line-to-left-circular (LTLC) conversion. We found two graphene surface plasmons (GSPs) modes were excited, which were responsible for the three LTC bands. The influences of axis lengths on the performances of LTC bands are investigated. Besides, the triple-band polarization converter can be realized when the incidence angle ranges from 0 degrees to 30 degrees and polarization angle ranges from 0 degrees to 9 degrees. Also, the frequency shifts of three LTC bands are also achieved by changing Fermi level of graphene. It is believed that our proposed polarizer can be widely used for multiband and tunable polarization conversion.
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页数：9
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