Tunability in metamaterials with mechanical rotation

Abstract

We study the tunable resonance characteristics of double split ring resonator (DSRR) at microwave band numerically. For the incident electromagnetic wave parallel to the incident plane, the DSRR structure shows magnetic and electric resonances at different frequencies respectively. When the E polarization along the two splits of the DSRR, the magnetic and the electric resonances have the strongest resonant intensities. As the DSRR metamaterial rotates along the H field, the frequencies of magnetic and electric resonances are kept unchanged, however, the resonant intensities decrease rapidly. The tunable metamaterial proposed in this paper only need rotate the metamaterial without structure changes or additional applied field, and has potential applications in electromagnetic switch and phase modulation. This simple tunable method could be used for higher frequency metamaterial, and expend the applications at terahertz and optical frequencies.