Design of a Novel THz Metamaterial Based on Combination of Different Split-Ring Resonators

Abstract

Increasing demand for the identification of nanoparticles with good precision and high selectivity has led to a significant growth of the use of optical sensors. In this paper, to response to this necessity, the structure of a terahertz metamaterial sensor based on O-shaped, cross and perfect resonators has been presented. The substrate material is GaAs and layers of Au are employed to construct the metamaterial structure. The sensitivity and figure of merit (FOM) are equal to 824 GHz/RIU and 2.42 RIU-I, respectively. The reason for such high accuracy in sensitivity is the presence of the perfect ring in the structure. Without this ring, we see around 200 GHz/RIU reduction in the sensitivity. The designed structure can be used in medicine to identify various tissues and viruses due to its sensitivity and having an operating frequency of 0.2-2 THZ.