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Dual-band and polarization-insensitive terahertz absorber based on fractal Koch curves 被引量:1
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作者 马岩冰 张怀武 +3 位作者 李元勋 王艺程 赖伟恩 李颉 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第5期594-599,共6页
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 resonato... 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. 展开更多
关键词 metamaterial absorber terahertz fractal geometry
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