太赫兹辐射
光学
材料科学
光电子学
波前
谐振器
极化(电化学)
微波食品加热
电磁辐射
物理
量子力学
物理化学
化学
作者
Jie Li,Yang Yue,Jining Li,Yating Zhang,Zhang Zhang,Hongliang Zhao,Fuyu Li,Tingting Tang,Haitao Dai,Jianquan Yao
标识
DOI:10.1002/adts.201900183
摘要
Abstract Electromagnetic metasurfaces are artificial 2D structures with sub‐wavelength size and have achieved a variety of functions. Coding metasurfaces or programmable metasurfaces are special phase‐manipulation type metasurfaces, which can be used for dynamic electromagnetic modulation and information processing in microwave band. However, programmable or tunable coding metasurfaces in terahertz band are still rare. All‐optical switchable coding metasurfaces based on vanadium dioxide (VO 2 ) hybrid resonators are proposed for dynamic modulation of terahertz waves. The C‐shaped metal–VO 2 hybrid resonators are switched from anisotropic structures to quasi‐isotropic ones due to insulator–metal transition of VO 2 , resulting in great attenuation of conversion efficiency for linearly polarized waves and Pancharatnam–Berry phase for circularly polarized waves. Based on this principle, several coding metasurfaces are shown for efficient and simultaneous switching of wavefront and polarization state of terahertz beams, including linearly and circularly polarized waves. It is worth mentioning that a new method for switchable shared‐aperture metasurfaces is also proposed, in which only a part of the unit cells are integrated with VO 2 and tunable. This new scheme promotes the applications of terahertz coding metasurfaces such as high‐speed terahertz communication.
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