Journal
PLASMONICS
Volume 13, Issue 1, Pages 123-130Publisher
SPRINGER
DOI: 10.1007/s11468-016-0491-z
Keywords
Metamaterial; Perfect absorber; Triple-band and five-band absorption
Funding
- National Natural Science Foundation of China [11647143]
- Natural Science Foundation of Jiangsu Province [BK20160189]
- Fundamental Research Funds for the Central Universities [JUSRP115A13]
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A new scheme to achieve a simple design of triple-band metamaterial absorber at terahertz frequency is presented. In this scheme, we employ a traditional sandwich structure, which is consisted of a metallic resonator and an appropriate thickness of the dielectric layer backed with an opaque metallic board, as the research object. Three strong but discrete resonance peaks with the narrow bandwidths and high absorptivities are realized. The combination of the dipolar resonance, LC (inductor-capacitor circuit) resonance, and the surface resonance of the metallic resonator determines the triple-band absorption. Numerical results also show that the frequencies of the three absorption bands and the number of the resonance peaks can be effectively tuned by adjusting or changing the geometric parameters of the metallic resonator. Moreover, we present a simple design of five-band terahertz absorber by further optimizing the sizes of the metallic elements in the top layer of the metamaterial. The design of the unit structures will assist in designing innovative absorbing devices for spectroscopy imaging, detection, and sensing.
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