材料科学
极化(电化学)
能量转换效率
光学
石墨烯
光电子学
太赫兹辐射
物理
纳米技术
物理化学
化学
作者
J X Fang,Wenqing Zhu,Lin Chen,Xiaotian Huang,Bohan Zhang,Daping He,shengxiang wang
出处
期刊:Optics Express
[The Optical Society]
日期:2023-06-26
卷期号:31 (14): 23095-23095
摘要
We present and numerically verify a functionally hybrid dual-mode tunable polarization conversion metasurface based on graphene and vanadium dioxide (VO 2 ). The tunable polarization converter consists of two patterned graphene layers separated by grating which is composed of gold and VO 2 . Due to the existence of phase change material VO 2 , the polarization conversion mode can be switched flexibly between the transmission and reflection modes. Theoretical calculations show the proposed polarization conversion metasurface can obtain giant asymmetric transmission (AT) at 0.42 and 0.77 THz when VO 2 is in the insulating state. Conversely, when VO 2 is in the metallic state, the converter switches to the reflection mode, demonstrating broadband polarization conversion for both forward and backward incidences. Furthermore, the conductivity of graphene can be modulated by changing the gate voltage, which allows dynamic control polarization conversion bandwidth of the reflection mode as well as the AT of the transmission mode. The robustness of the metasurface has also been verified, the high polarization conversion efficiency and AT can be maintained over wide incidence angles up to 65° for both the xoz plane and yoz plane. These advantages make the proposed hybrid tunable polarization conversion metasurface a promising candidate for THz radiation switching and modulation.
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