太赫兹辐射
光学
光电子学
极化(电化学)
材料科学
带宽(计算)
圆极化
宽带
偏压
物理
电压
电信
微带线
化学
物理化学
量子力学
计算机科学
作者
Jiarui Zhang,Kun Zhang,Ai-Li Cao,Yan Liu,Weijin Kong
出处
期刊:Optics Express
[The Optical Society]
日期:2020-08-20
卷期号:28 (18): 26102-26102
被引量:41
摘要
In this letter, we have proposed a bi-functional switchable broadband polarization converter based on the hybrid graphene-metal metasurface. Turning the bias voltage to change Fermi level E f from 0 to 1.0 eV, the metasurface can switch between quarter-wave plate (QWP) and half-wave plate (HWP) in the frequency band 1.38-1.72 THz. Besides, the metasurface simultaneously works as a broadband QWP and HWP in different frequency range when E f = 1.0 eV. In addition, when E f is in the range of 0.3 eV-0.6 eV, the metasurface can work as bi-functional broadband QWP in different frequencies as well. The physical mechanism of the bi-functional polarization converter can be explained by the electric field amplitude distributions. What’s more, we find that the metasurface can work well with a tolerance to the incident light polarization angle of about ± 12.5°, which can also change the converted wave from RHCP to LHCP with the incident polarization angle change of 90°. The hybrid metasurface with the advantages of switchable bi-functions, wide operating bandwidth, and ultra-thin thickness, may achieve potential applications in tunable devices for terahertz communications.
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