光学
太赫兹辐射
石墨烯
电介质
材料科学
极化(电化学)
偏压
光电子学
电压
纳米技术
物理
量子力学
物理化学
化学
作者
Shengnan Guan,Jierong Cheng,Tiehong Chen,Shengjiang Chang
出处
期刊:Optics Letters
[The Optical Society]
日期:2019-11-21
卷期号:44 (23): 5683-5683
被引量:27
摘要
In this Letter, we propose a hybrid graphene-dielectric metasurface as a bi-functional polarization converter. It can switch between a reflective half-wave plate and a quarter-wave plate around 1 THz by merely applying external biasing voltage, without reoptimizing the dielectric structure. Switching of the two wave plates originates from distinct dispersion of the orthogonal eigenmodes with the chemical potential, which is further explained by the overlapping of graphene and the dielectric resonance modes. Compared with graphene-metallic metasurfaces, a combination of graphene with dielectric microstructures offers an alternative solution for active terahertz devices with high efficiency and large flexibility.
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