Transmission dip based on coupling of bright mode and dark modes in a metasurface

In this paper, we propose a transmission dip in a terahertz (THz) metamaterial device by employing the coupling between bright mode and interference of dark modes. We provide the theoretical analysis, analytical calculations, and simulations to present the transmission spectrum of metamaterials. Furthermore, we observe the tendency of the transmission spectrum through experiments, which effectively verify our idea. Ideally, this transmission dip can produce a very high-Q peak in the middle of the transmission spectrum of electromagnetically induced transparency (EIT), which can be useful for highly sensitive metamaterial sensors, optical switches, and photomemory.