Terahertz Metamaterial with Active Switching Characteristic

We propose and demonstrate two designs of tunable terahertz (THz) metamaterial with active switching characteristic. They are composed of asymmetrical L-shape metamaterial with single-layer and dual-layer. They are denoted as Design_l and Design_2 for metamaterial with single-layer and dual -layer, respectively. Desing_1 has three resonances at 0.19 THz, 0.33 THz and 0.49 THz. The tuning range of resonance is 0.06 THz by changing the distance between asymmetrical L-shape microstructures. Design_2 has three resonances kept as identical as those of Design_l, and two resonances are generated at 0.26 THz and 0.40 THz. By changing the height between top and bottom L-shape metamaterial, it can be realized the active switching function. These designs of asymmetrical L-shape metamaterials can be performed using MEMS technique to provide a potential function in THz spectrum range.