Abstract
A multi-band terahertz metamaterial absorber (MA) is proposed. The unit cell is formed by windmill-shaped elements in a square ring, a dielectric substrate and a metallic ground plane. The MA unit cell is investigated at normal and oblique incidence for both transverse electric (TE) and transverse magnetic (TM) polarizations. The simulated results show that the MA has three high absorption (greater than 99%) resonance narrow bands. The LC equivalent circuit is employed to analyze the origin of multi-band. The proposed MA is easy to fabricate, what’s more, the proposed MA has high absorption rate and insensitive to polarization, which is favorable for various applications, such as terahertz detecting, imaging, and so on.
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