Design and anlysis of multiband high refractive index metamaterials

Abstract

A multiband metamaterial operating in the 0 THz to 2 THz range was designed with two high refractive index values. The dimension of the slab of the metamaterial is 300 um by 300um and the thickness is 17.45 um. Twenty five resonant metallic structures were placed in the substrate material, with a gap of 1.2 um between each unit. Results show enhanced dielectric response as well as suppressed diamagnetic response at these frequencies, which exhibit high permittivity and high permeability. Two bands of high refractive index were observed in the FDTD simulation result.

Design and Analysis of a THz Metamaterial Structure with High Refractive Index at Two Frequencies

“…Figure 1(a) shows a metallic cube-like structure exposed to the magnetic field with a large area surrounded by the current loops induced on the surface of the structure, while Figure 1 Figure 1(c), it shows an even improved structure with cut slits on the top and bottom panel of the structure to reduce the area surrounded by the current loop while maintaining the electric charge. According to the fringe-field effect [24,25], the total surface charge on the top and bottom panel remains the same as the one without cut slits. As a result, the electric response remains the same while the diamagnetic response is reduced when the area parallel to the magnetic field as produced in Figure 1(a) is made smaller by etching the surfaces as shown in Figure 1(c).…”