Broadband carbon-based all-dielectric metamaterial absorber enhanced by high-contrast gratings based spoof surface plasmon polaritons

In this paper, high-contrast gratings based spoof surface plasmon polaritons (HCG-based SSPPs), as a new mechanism of all-dielectric metamaterial absorbers (ADMMAs), are used to enhance their bandwidth. Accordingly, a broadband ADMMA is designed with carbon black composite. It consists of a cylinder array structure which is made of this composite. The simulation results show that broadband absorption is realized from 6.1 GHz to 18 GHz with three absorption peaks under a total thickness of 3.9 mm. The first peak is attributed to HCG-based SSPPs, while the other two are attributed to diffraction effects. The improved impedance matching characteristic in a wide band also makes an important contribution. The experimental results are agreed roughly with the simulation results. In addition, the structure designed is not a standard HCG, indicating that HCG-based SSPPs are expected to become universal mechanism of ADMMAs. It is believed that this work will push forward further studies on more applications of HCG-based SSPPs in ADMMAs.

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