A multiband terahertz metamaterial based on strong near-field coupling mechanism

Abstract

In this paper, both theoretical and experimental investigations of a quadruple-resonance terahertz metamaterial (QTM) with two asymmetrically combined Electric-inductance-capacitance (ELC) resonators is demonstrated. Due to the strong mutual coupling in the asymmetrically hybrid single-particle monolayer-metal-structure, the multiband resonances are significantly enhanced. The analysis of the simulated surface current and electric field distributions gives insight to the different coupling mechanisms amongst ELC, dipole and quasi-quadrupole resonances at different resonant frequencies. Furthermore, the experimental results show good accordance with the simulated results. The proposed metamaterial with structural compactness, designing flexibility, and enhanced resonances shows great potentials in terahertz detection, sensing and communication.