Broadband Ultra-Thin Terahertz Absorber with Graphene-Based Metamaterial Films

摘要

In this paper, a novel terahertz absorber was proposed. By utilizing the different SPPs existing conditions in metal and graphene, inverse currents were produced to break the ways of electromagnetic waves. The whole thickness of the model is 1.5 um. A cross-type metal gold, a grapheme sheet and a silicon dioxide substrate were fabricated to boost the resonance at 15.6THz. The bandwidth reaches 202GHz with 99% and 90% absorption ratio and the results show great absorption in both TE and TM polarized waves. For detailing the function of the graphene, the models with and without graphene were simulated in the same condition for comparison. According to the analysis results, a multiple layer model is proposed to further improve the bandwidth and gain the absorption from 13.8THz to 14.6THz, which basically correspond to our theory expectation.