太赫兹辐射
光学
光电子学
材料科学
极化(电化学)
宽带
半导体
锗
波长
反射(计算机编程)
硅
物理
化学
计算机科学
物理化学
程序设计语言
作者
Ying Tian,Lichang Han,Yan Li,Jiayun Wang,Binzhen Zhang,Zan Jiao
出处
期刊:Micromachines
[Multidisciplinary Digital Publishing Institute]
日期:2022-08-25
卷期号:13 (9): 1387-1387
被引量:15
摘要
In the terahertz band, how integrating multiple functions into a device with a tiny unit structure is a challenge. In this paper, an optically-controlled multifunctional linear polarization conversion metasurface working in the terahertz band is proposed. The reflection and transmission polarization conversion functions can be realized by irradiating the metasurface with pump light with different wavelengths. The metasurface is designed with a multilayer structure, and a photosensitive semiconductor alone is used to control multiple functions, which makes the manipulation of multifunctional devices easy. When the photosensitive semiconductor germanium (Ge) and silicon (Si) are in different states, the metasurface can realize broadband reflection and transmission polarization conversion functions, the corresponding relative bandwidth are 102.4% and 98.9%, respectively, and the work efficiency can be regulated by pump light with different intensity and wavelength. In addition, the working principle of the metasurface is analyzed by eigenmode theory and surface current distributions. The stability of the metasurface to structural parameters and incident angles are discussed.
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