近年来, 由亚波长人工微结构单元组成的超构材料, 因其具有自然材料所不具备的奇特物理性质, 吸引了人们的广泛关注.其中最有趣的应用之一就是利用亚波长人工微结构增强对电磁波的吸收.设计并实现了一种人工超构材料柔性可弯曲的高性能太赫兹吸收器.为了实现最优的结构设计, 分别对器件的结构周期、金属条宽度、介质层厚度和材料光学性质等关键结构及材料参数进行了系统优化.实验结果显示在频率3 THz附近器件峰值吸收率高达99%, 与数值模拟结果相吻合.

In recent years, Metamaterials, artificial electromagnetic materials that are constructed by sub-wavelength units, have demonstrated unusual abilities to manipulate electromagnetic waves and promised many potential applications. One of the most intriguing applications of metamaterials is to function as high performance absorbing medium. In this work, a new type of plasmonic flexible metasurface-based super-absorber for Terahertz waves is designed, fabricated and characterized. Dependences of absorption on the optical properties of component materials and geometric parameters are optimized by full-wave numerical simulations, and then confirmed by experiments. Experimental results show that an absorption peak value of 99% is obtained at the frequency of 3 THz, which are in good agreement with numerical simulations.