Li Jing, Liu Yanfei, Chen Yu, Chen Wenqing, Guo Honglei, Wu Qiannan, Li Mengwei
School of Instrument and Electronics, North University of China, Taiyuan 030051, China.
School of Instrument and Intelligent Future Technology, North University of China, Taiyuan 030051, China.
Micromachines (Basel). 2023 Jan 13;14(1):201. doi: 10.3390/mi14010201.
We propose a functionally tunable terahertz (THz) metamaterial absorber, which has the switching performance between broadband-narrowband and dual-broadband near-perfect absorption due to the phase transition of Vanadium dioxide (VO) and the tunable electrical property of graphene. The switching absorption properties are verified by computer simulation technology (CST) microwave study. The simulation results show that when VO is in the metallic phase, over 90% broadband absorption is realized in the 3.85-6.32 THz range. When the VO is in the insulating phase, the absorber shows quadruple narrowband absorption. By changing the Fermi level of graphene and the conductivity of VO, the low-frequency broadband of 3.85-6.32 THz can be switched to the high-frequency broadband of 6.92-8.92 THz, and the absorber can be switched from a quadruple narrowband to a nearly singlefold narrowband. In addition, the proposed absorber is insensitive to polarization due to its symmetry and wide incident angle. The design may have potential applications in the THz range, such as switches, electromagnetic shielding, cloaking objects, filtering, sensing, and so on.
我们提出了一种功能可调的太赫兹（THz）超材料吸收体，由于二氧化钒（VO）的相变和石墨烯的可调电学性质，该吸收体在宽带-窄带和双宽带近完美吸收之间具有切换性能。通过计算机模拟技术（CST）微波研究验证了其切换吸收特性。模拟结果表明，当VO处于金属相时，在3.85-6.32太赫兹范围内实现了超过90%的宽带吸收。当VO处于绝缘相时，吸收体呈现四重窄带吸收。通过改变石墨烯的费米能级和VO的电导率，3.85-6.32太赫兹的低频宽带可切换到6.92-8.92太赫兹的高频宽带，吸收体可从四重窄带切换到近单重窄带。此外，由于其对称性和宽入射角，所提出的吸收体对偏振不敏感。该设计在太赫兹范围内可能具有潜在应用，如开关、电磁屏蔽、物体隐身、滤波、传感等。
