Asymmetric Double Split-Ring Resonators in the Terahertz Region

We investigated the terahertz transmission characteristics of planar asymmetric metamaterials composed of double split-ring resonators with two gaps displaced away from the center in the opposite and positive direction. When the two gaps are designed in the opposite direction, only one resonant drop emerges at about 1.3 THz. When displaced in the positive direction, two resonant drops are observed at the fundamental inductive-capacitive resonance and dipole-electric resonance. Besides, increasing the length of the sides parallel to the polarization of the incident terahertz wave, the resonant frequencies are observed to red shifting. This theoretical simulation will be good reference for the following experience, and these asymmetric metamaterials will promote new avenues to the control of terahertz waves.