Dual-resonant terahertz metamaterial with high Q-factors

A dual-resonant THz metamaterial with high Q-factor property is proposed in this letter. Two semi-circle resonator with rectangular substrate are chosen as unit cell of the metamaterial. Numerical simulations reveal that the metamaterial can perform strong absorption peak of more than 90% and high Q-factor more than 30 simultaneously. Moreover, the dipole-dipole interaction model is used to analysis the operating principle of the proposed structure. The metamaterial has such advantages of simple structure, strong absorption and high Q-factor. In the future, it may be employed as high-performance sensors or filters.