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

doi:10.1088/1674-1056/23/5/058102

中国物理B ›› 2014, Vol. 23 ›› Issue (5): 58102-058102.doi: 10.1088/1674-1056/23/5/058102

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

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

马岩冰^a, 张怀武^a, 李元勋^{a b}, 王艺程^a, 赖伟恩^a, 李颉^a

a State Key Laboratory of Electronic Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;
b Institute of Electronic and Information Engineering, University of Electronic Science and Technology of China, Dongguan 523808, China

收稿日期:2013-07-09 修回日期:2013-10-28 出版日期:2014-05-15 发布日期:2014-05-15
基金资助:
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).

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

Ma Yan-Bing (马岩冰)^a, Zhang Huai-Wu (张怀武)^a, Li Yuan-Xun (李元勋)^{a b}, Wang Yi-Cheng (王艺程)^a, Lai Wei-En (赖伟恩)^a, Li Jie (李颉)^a

a State Key Laboratory of Electronic Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;
b Institute of Electronic and Information Engineering, University of Electronic Science and Technology of China, Dongguan 523808, China

Received:2013-07-09 Revised:2013-10-28 Online:2014-05-15 Published:2014-05-15
Contact: Ma Yan-Bing E-mail:mayanbing_uestc@163.com
About author:81.05.Xj; 42.25.Bs; 42.60.Da
Supported by:
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).

摘要/Abstract

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 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 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.

关键词: metamaterial absorber, terahertz, fractal geometry

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 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 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.

Key words: metamaterial absorber, terahertz, fractal geometry

中图分类号: (Metamaterials for chiral, bianisotropic and other complex media)

81.05.Xj

42.25.Bs (Wave propagation, transmission and absorption) 42.60.Da (Resonators, cavities, amplifiers, arrays, and rings)

马岩冰, 张怀武, 李元勋, 王艺程, 赖伟恩, 李颉. Dual-band and polarization-insensitive terahertz absorber based on fractal Koch curves[J]. 中国物理B, 2014, 23(5): 58102-058102.

Ma Yan-Bing (马岩冰), Zhang Huai-Wu (张怀武), Li Yuan-Xun (李元勋), Wang Yi-Cheng (王艺程), Lai Wei-En (赖伟恩), Li Jie (李颉). Dual-band and polarization-insensitive terahertz absorber based on fractal Koch curves[J]. Chin. Phys. B, 2014, 23(5): 58102-058102.

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

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

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