Surface plasmon resonance-enhanced broadband perfect absorption in a Ti3C2Tx-based metamaterial absorber

The absorption band in which near-unity or perfect absorption can be realized is still narrow in the current broadband metamaterial absorbers (BMAs). In this article, a broadband perfect metamaterial absorber (BPMA) based on surface plasmon resonance (SPR) is proposed for the visible and near-infrared range. The BPMA composed of a patterned Ti3C2Tx layer, SiO2 layer and the ground gold layer can offer over 90% absorption across the wavelength range of 639-967 nm. It is worth noting that near-unity absorption can be achieved in the range 728-890 nm, which is out of reach by the currently reported BMA. The electric field distribution reveals that localized SPR generated by the Ti3C2Tx layer contributes to the broadband perfect absorption. Additionally, the BPMA is insensitive to incident and polarized angles at TE and TM modes. The calculated results based on interference theory agree well with the simulation results, thus supporting the design. This work may provide a potential approach to broadband perfect absorption in the visible and near-infrared region.