Actively electromagnetic modulation of IHI-shaped terahertz metamaterial with high-efficiency switching characteristic

摘要

We present terahertz (THz) metamaterial with multi-configurations, which are composed of H-shaped, II-shaped, and IHI-shaped configurations, respectively. By changing the geometrical dimension of H-shaped metamaterial, the electromagnetic response exhibits switch and bandwidth modulation characteristics between 0.20?THz and 0.30?THz. For II-shaped metamaterial, the electromagnetic response shows the single-resonance and dual-resonance switching and tunable free spectrum range (FSR) characteristics. The superimposed structures of H- and II-shaped metamaterials to form IHI-shaped metamaterial, which exhibits the combinations of H- and II-shaped metamaterials characterizations. The resonances could be switched at 0.25?THz, 0.55?THz, and 0.95?THz depending on the metamaterial pattern. To increase the flexibility of proposed device, there are composed of dual-layer IHI-shaped metamaterial on Si substrate. The FSR could be tuned from 0.16?THz to 0.05?THz by changing the height of top IHI-shaped metamaterial. These optical properties of IHI-shaped metamaterial open an avenue to be used in widespread applications with high portability, flexibility, and compatibility.