Plasmonic Fishnet Structures for Dual Band THz Left-Handed Metamaterials

Abstract

Plasmonic fishnet structures are proposed to realize dual-band terahertz (THz) left-handed metamaterials (LHMs). The calculated permittivity ε and permeability μ of single-layer LHMs show that ε < 0 and μ < 0 can be simultaneously satisfied in two frequency bands, resulting in dual-band LHMs. The electric and magnetic field distributions are consistent with the current distributions and confirm the physical mechanism of negative permeability. Furthermore, the existence of negative refraction is validated by a stacked LHMs prism with an angle of 1.79°. It is shown that at 2.04–2.42 THz and 3.12–3.28 THz bands, negative refractive indices of the prism can be obtained, facilitating the practical application of LHMs in THz image, sensor, detection, communication, and so on.

Realization of Broadband Negative Refractive Index in Terahertz Band by Multilayer Fishnet Metamaterial Approach

“…The work of [14,31] demands the fabrication of vertically standing structures that are complicated to fabricate. Zhang et al [32] depicted dual band NRI response in the THz range with a SiO 2 substrate. However, all these studies consider a dispersion-free dielectric or semiconductor substrate material which can be questionable in terms of its accuracy and reliability of the results.…”