Enhanced quadruple-resonant terahertz metamaterial with asymmetric hybrid resonators

摘要

This paper presents the design, fabrication and investigation of a quadruple-resonant terahertz meta material that comprises two different Electric-inductance capacitance (ELC) resonators in a vertical configuration. Owing to asymmetric electric field coupling between the two resonators, the combined structure exhibits better performance in terms of transmission minima and bandwidths than the individual particles. The distributions of the surface current and electric field reveal quasi-quadrupole resonance, electric dipolar resonance and coupling between these resonances at different resonant frequencies. Moreover, the resonant frequencies are tunable by adjusting the corresponding geometrical parameters. Above all, the excellent performance of the proposed structure makes it promising for application in multiband terahertz devices. (C) 2017 Elsevier B.V. All rights reserved.