Modulation of response frequency and absorption bandwidth for terahertz metamaterials

Most materials in nature do not have electromagnetic response in the terahertz (THz) frequency range. THz metamaterials that were invented recently provide an opportunity for the development and application of THz technology. However, the conventional methods for modulating the THz metamaterials are complicated. In this paper, we present a novel and simple way to adjust the THz metamaterials just by zooming in and out the THz metamaterial's unit. Simulation results show that THz metamaterials are still impedance-matching, even after the ratio change. In addition, the resonance frequency changes inversely with the unit ratio. Absorption bandwidth will be widened when the THz metamaterial's unit is shrunk. According to our approach, any response frequency of THz metamaterials (a value of absorption peak is greater than 98%) can be acquired within specific frequency bands. This modulation simplifies the THz metamaterial design and broadens the applications of metamaterials in detectors.