Dual-band and polarization-insensitive terahertz absorber based on fractal Koch curves

作     者：马岩冰 张怀武 李元勋 王艺程 赖伟恩 李颉 

作者机构：State Key Laboratory of Electronic Films and Integrated DevicesUniversity of Electronic Science and Technology of China Institute of Electronic and Information EngineeringUniversity of Electronic Science and Technology of China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2014年第23卷第5期

页      面：594-599页

核心收录：

学科分类：0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.60721001,51132003,and 61171047) the National Natural Youth Fund of China(Grant No.61001025) the National Programs for Science and Technology Development of Guangdong Province,China(Grant No.2010B090400314) 

主　　题：metamaterial absorber terahertz fractal geometry 

摘      要：We report the design, fabrication, and characterization of a dual-band and polarization-insensitive metamaterial ab-sorber （MA）, which consists of periodically arranged fractal Koch curves acting as the top resonator array and a metallic ground plane separated by a dielectric spacer. Compared with conventional MAs, a more compact size and multi-frequency operation are achieved by using fractal geometry as the unit cell of the MA. Both the effective medium theory and the multi- reflection interference theory are employed to investigate the underlying physical mechanism of the proposed terahertz MA, and results indicate that the latter theory is not suitable for explaining the absorption mechanism in our investigated struc-ture. Two absorption peaks are observed at 0.226 THz and 0.622 THz with absorptivities of 91.3% and 95.6% respectively and good agreements between the full-wave simulation and experimental results are achieved.