| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Multiband terahertz metamaterial absorber |
| Xu Zhuoa, Gu Chaob, Pei Zhi-Binb, Liu Jiab, Qu Shao-Boc, Gu Weid |
| a Electronic Materials Research Laboratory, Key Laboratory of Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China; b The College of Science, Air Force University of Engineering, Xi'an 710051, China; c The College of Science, Air Force University of Engineering, Xi'an 710051, China;Electronic Materials Research Laboratory, Key Laboratory of Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, China; d The Engineering and Technical College of Chengdu University of Technology Department of Computer Science and Technology, Leshan 614300, China |
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Abstract This paper reports the design of a multiband metamaterial (MM) absorber in the terahertz region. Theoretical and simulated results show that the absorber has four distinct and strong absorption points at 1.69, 2.76, 3.41 and 5.06 THz, which are consistent with `fingerprints' of some explosive materials. The retrieved material parameters show that the impedance of MM could be tuned to match approximately the impedance of the free space to minimise the reflectance at absorption frequencies and large power loss exists at absorption frequencies. The distribution of the power loss indicates that the absorber is an excellent electromagnetic wave collector: the wave is first trapped and reinforced in certain specific locations and then consumed. This multiband absorber has applications in the detection of explosives and materials characterisation.
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Received: 30 March 2010
Revised: 19 May 2010
Published: 15 January 2011
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PACS:
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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41.20.Jb
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(Electromagnetic wave propagation; radiowave propagation)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 60871027, 60901029 and 61071058), the National Basic Research Program of China (Grant No. 2009CB623306) and Key Laboratory of Shaanxi Provincial Synthetic Electronic Information System Foundation, China (Grant No. 200905A). |
Cite this article:
Gu Chao, Qu Shao-Bo, Pei Zhi-Bin, Xu Zhuo, Liu Jia, Gu Wei Multiband terahertz metamaterial absorber 2011 Chin. Phys. B 20 017801
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