Flexible perfect metamaterial absorber and sensor application at terahertz frequencies

In this study, flexible perfect metamaterial absorber at terahertz frequencies was presented. The unit cells of the proposed metamaterial have a flexible structure consisting of gold resonator, GaAs patch, polyimide substrate, and gold ground plane. First, the optimization procedure according to the geometric parameters was performed and it was shown that the permittivity and permeability parameters that determine the nature of the metamaterials were simultaneously negative for the proposed metamaterial. Then, the absorption, the reflection, and the transmission graphs of the structure were investigated. As a result, this flexible metamaterial structure had a perfect absorption with potentials to use in many applications. Finally, the pressure and permittivity sensing applications were performed for the proposed metamaterial structure. The sensing capacities of the obtained sensor structures were calculated according to the absorption results. It was seen that the proposed perfect metamaterial absorber can be used in many applications where such sensors are needed.