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

ISSN号：1674-1056
期刊名称：《中国物理B：英文版》
时间：0
分类：TN943.3[电子电信—信号与信息处理;电子电信—信息与通信工程] O18[理学—数学;理学—基础数学]
作者机构：[1]State Key Laboratory of Electronic Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China, [2]Institute of Electronic and Information Engineering, University of Electronic Science and Technology of China, Dongguan 523808, China
相关基金：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）, and the National Programs for Science and Technology Development of Guangdong Province, China （Grant No. 2010B090400314）.

作者：马岩冰[1], 张怀武[1], 李元勋[1,2], 王艺程[1], 赖伟恩[1], 李颉[1]

关键词：分形几何, 吸收机制, 太赫兹, 线极化, 敏感, 双频, 有效介质理论, 周期性排列, metamaterial absorber, terahertz, fractal geometry

中文摘要：

We report the design, fabrication, and characterization of a dual-band and polarization-insensitive metamaterial absorber(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 multireflection 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 structure. 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.

英文摘要：

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.