Perfect absorption based on Ti3C2Tx surface plasmon resonance

As a kind of emerging two-dimensional material, Ti3C2Tx possesses metal-like property, which can be utilized to generate strong surface plasmon resonance in optical regime. In this paper, a perfect metamaterial absorber (BPMA) is proposed, which consists of the top Ti3C2Tx layer, the middle SiO2 layer and the bottom gold layer. The BPMA with the simple structure can achieve perfect (near-unity) absorption ranging from 693 nm to 897 nm. The electric field distribution reveals that the perfect absorption in this wavelength range is attributed to localized surface plasmon resonance produced by Ti3C2Tx. Furthermore, the perfect absorption exhibits good stability to polarization and incident angles. The calculated absorptivity based on interference theory agrees well with the simulation result, thereby demonstrating the design. This work provides a simple method to achieve perfect absorption across a wavelength range in visible and near-infrared regions.