Mou Nanli, Tang Bing, Li Jingzhou, Zhang Yaqiang, Dong Hongxing, Zhang Long
Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China.
Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
Materials (Basel). 2021 Sep 30;14(19):5708. doi: 10.3390/ma14195708.
Metamaterial absorbers (MMAs) with dynamic tuning features have attracted great attention recently, but most realizations to date have suffered from a decay in absorptivity as the working frequency shifts. Here, thermally tunable multi-band and ultra-broadband MMAs based on vanadium dioxide (VO) are proposed, with nearly no reduction in absorption during the tuning process. Simulations demonstrated that the proposed design can be switched between two independently designable multi-band frequency ranges, with the absorptivity being maintained above 99.8%. Moreover, via designing multiple adjacent absorption spectra, an ultra-broadband switchable MMA that maintains high absorptivity during the tuning process is also demonstrated. Raising the ambient temperature from 298 K to 358 K, the broadband absorptive range shifts from 1.194-2.325 THz to 0.398-1.356 THz, while the absorptivity remains above 90%. This method has potential for THz communication, smart filtering, detecting, imaging, and so forth.
具有动态调谐功能的超材料吸收器（MMA）近来备受关注，但迄今为止，大多数实现方式都存在随着工作频率偏移吸收率下降的问题。在此，提出了基于二氧化钒（VO）的热可调谐多频段和超宽带MMA，在调谐过程中吸收率几乎没有降低。模拟表明，所提出的设计可以在两个独立可设计的多频段频率范围内切换，吸收率保持在99.8%以上。此外，通过设计多个相邻的吸收光谱，还展示了一种在调谐过程中保持高吸收率的超宽带可切换MMA。将环境温度从298 K提高到358 K，宽带吸收范围从1.194 - 2.325 THz 移至0.398 - 1.356 THz，而吸收率保持在90%以上。该方法在太赫兹通信、智能滤波、检测、成像等方面具有潜力。
