The Influence on the Q Value of the THz Metasurface From the Tip Charge Accumulation Coupling

With the adventure of metamaterials, there has been a tremendous advancement in the manipulation of the terahertz (THz) wave. However, the excitation of high-Q-factor resonance has been a great challenge in traditional metamaterials due to ohmic and radiation losses. In this paper, the influence of the tip charge accumulation effect on the high-Q-value meta-surface has been studied within the triangular array meta-surface. It is found that when the tip charges accumulate from each pair of triangular elements, they can couple with each other to construct a significant resonant mode which can trap more energy to achieve higher Q value. Moreover, the stacking of the induced charges distributed at the surface of the meta-unit making the coupling strength is further increased so that the strong tip charge accumulation effect could also affect the Q value. The experiment verified this phenomenon, which shows the stronger coupling resonance, and tip charge accumulation could result in the enhancement of the Q value. This research has potential applications in high-Q THz devices.