Low thermal SRR metamaterial design with multi-layered structured for terahertz frequency applications

Abstract

The goal of this study is to examine the effects of split-ring resonators (SRR) with compact square shapes at terahertz frequencies. Therefore, a unique and miniaturised SRR metamaterial was constructed in this work. Every simulation was performed by using the Computer Simulation Technology software to explore the radar cross-section (RCS), reflection and transmission coefficients. Furthermore, MATLAB software was adopted to calculate the characteristics of an effective medium for the recommended SRR metamaterial. The initial metamaterial structure consists of a single layer that exhibits lower peak points with unsatisfactory magnitude values. Therefore, by adopting the trial and error technique, a few parametric studies were conducted to select the optimised metamaterial. For instance, various square-shaped design analyses, investigation of different substrate materials with a dielectric constant between 3.5 and 11.9, multi-layer structures, and larger-scale analyses were explored in this work. According to the observation, the quintuple layer SRR design was adopted since it possesses multiple resonances with reasonable magnitude values at 2.58, 3.78, 7.54, 7.77, 8.21, 8.5, and 8.88 THz. Moreover, the proposed quintuple-layer metamaterial helps to reduce the RCS values from −128.5 to −90.93 dBm2 at 2.58 THz when adopting an array cell structure. Moreover, this work also examines and analyses the thermal distribution of the proposed quintuple-layer metamaterial at all resonance frequencies. The observation revealed only small temperature distribution discrepancies occurred on the design structure compared to all peak points. In a nutshell, the proposed quintuple-layer SRR metamaterial achieved the purpose of this research and is practically applicable for the terahertz frequency.