Performance Analysis of a Semi-Transparent Copper Based Negative Index Metamaterial Arrays

This paper considers an array unit of a meta-material (MTM) structure and examines the performance of various configurations of the array unit. Array units of a square-shaped opposingly facing L-structured MTM with double negative (DNG) and negative refractive index (NRI) features are explored. The top layer of the structure is formed by a copper-based SRR structure with additional splits and rectangular inner strips atop a lead glass substrate. Negative refraction bandwidth as well as DNG bandwidth, where both negative permittivity and permeability are attained, has been discovered in the array unit and different configurations of the array unit. The negative index bandwidth of the array unit, 1×2 configuration, and 2×2 configuration are at 3.774-3.781, 1.563-1.873, 1.532-1.824 THz, respectively. High Figure of Merit (FOM) is attained in all three configuration examined. Peak FOM attained at the array unit and it's 1×2 and 2×2 topologies are 63, 172, 77, respectively. Effective medium ratio (EMR) of the array unit and it's 1×2 and 2×2 topologies at 3.75, 1.65, 1.75 THz are 1.97, 2.26, 2.2, respectively. The proposed MTM can be utilized in THz sensing, detection, communication, and other applications.