Dual-band terahertz metamaterial absorber with very sensitive sensing ability in terms of the surrounding index is demonstrated.

This paper presents a kind of multi-band terahertz superabsorber, its surface structure consists of a square metallic patch with a very small rectangular hole whose area is only 3.94% of...

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Triple-band terahertz metamaterial absorber with near 100% absorption is suggested in this paper. It is designed by two different lengths of Au bars and an Au substrate separated by an ultra-thin thickness of dielectric spacer. Three separated resonance absorption peaks (labeled A, B, and C) with narrow bandwidths and high absorption rates are realized. The first two peaks A and B are ascribed to the fundamental modes of the two Au bars, respectively, whereas the excitation of 3-order response in the longer Au bar results in the peak C. The field distributions of peaks A, B, and C are provided to verify their mechanisms. Independent frequency modulation of the three peaks (with slight change of absorption strength) can also be achieved, which is different from previous works that changes in parameters affect all absorption peaks. Further structure optimization allows for more absorption peaks, such as quad-band or penta-band. These suggested light absorbers could be designed for potential applications in terahertz technology related fields.

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Multiple-band metamaterial absorbers have been widely reported using the co-planar or layered design methods. However, these obtained absorption devices are of complex structure, large unit size, heavy weight, and time-consuming construction steps. Herein, an alternative design strategy is suggested to realize the multiple-band absorption at terahertz frequency. By introducing air gaps into the rectangular metallic patch, the original rectangular resonator can be divided into multiple sub-structures (or separated sections), and the combined effect of the localized resonance response of these sub-structures (or separated sections) gives rise to the multiple-band absorption. More importantly, the size, position and number of air gaps play the important roles in controlling the resonance performance of the absorption peaks and even in regulating the amount of the absorption peaks. Compared with the existing multiple-band absorption design strategies, the proposed approach does not increase the unit size, nor need to stack multiple layers, which provides important guidance for the design of multiple-band terahertz metamaterial absorbers with simple, compact, and easy to fabricate for full details.