| Dual-band and polarization-insensitive terahertz absorber based on fractal Koch curves |
| |
| 作者姓名： | 马岩冰 张怀武 李元勋 王艺程 赖伟恩 李颉 |
| |
| 基金项目： | 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) |
| |
| 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.
|
| 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 |
Dual-band and polarization-insensitive terahertz absorber based on fractal Koch curves |
| |
| Ma Yan-Bing,Zhang Huai-Wu,Li Yuan-Xun,Wang Yi-Cheng,Lai Wei-En,Li Jie.Dual-band and polarization-insensitive terahertz absorber based on fractal Koch curves[J].Chinese Physics B,2014(5):594-599. |
| |
| Authors: | Ma Yan-Bing Zhang Huai-Wu Li Yuan-Xun Wang Yi-Cheng Lai Wei-En Li Jie |
| |
| Abstract: | 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. |
| |
| Keywords: | metamaterial absorber terahertz fractal geometry |
| 本文献已被 CNKI 维普 等数据库收录！ |
