A tunable terahertz metasurface with function of polarization conversion and circular dichroism

被引：2
|
作者：
Jia, Yang [1 ,2 ]
Zhang, Xin [1 ]
Wang, Guan [1 ]
Liu, Jia [1 ]
Yang, Shuang [1 ]
Feng, Hengli [1 ]
Miao, Fengjuan [2 ]
Gao, Yachen [1 ]
机构：
[1] Heilongjiang Univ, Sch Elect Engn, Harbin 150080, Heilongjiang, Peoples R China
[2] Qiqihar Univ, Coll Commun & Elect Engn, Qiqihar 161000, Heilongjiang, Peoples R China
来源：
OPTICS COMMUNICATIONS | 2024年 / 564卷
关键词：
Metasurface; Circular dichroism; Polarization conversion; Graphene; PB phase; ABSORPTION;
D O I：
10.1016/j.optcom.2024.130490
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A tunable and multifunctional electromagnetic control metasurface is proposed. The metasurface comprises the graphene sheet and gold open ring, enabling multiband cross -polarization conversion (CPC) and line -to -circular polarization conversion (LTCPC). Simultaneously, it can achieve circular dichroism (CD) with amplitude of 0.99 at 2.28 THz, along with the capability for near -field imaging. The physical mechanism of operation is studied by analyzing surface current distribution and electric field. In addition, because the metasurface exhibits chiral characteristics, appropriate rotation can induce a phase gradient, facilitating a phase coverage of 0-360 degrees. Based on the tunable phase gradient of metasurface, anomalous reflection and vortex beams can be realized.
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页数：10
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