Plasmonic-induced transparency based on plasmonic asymmetric dual side-coupled cavities

A method of the analog of electromagnetically induced transparency (EIT) in plasmonic metal–dielectric–metal (MIM) waveguide is proposed by using two asymmetric side-coupled cavities and simulated by Finite-difference time-domain (FDTD). The simulation results show that the transparency peak of EIT is very sensitive to the width difference of two cavities and the difference of coupling distances of two cavities with the bus. Furthermore, we find that high transmission of EIT-peak usually accompanies a relatively low quality factor. These properties of our novel plasmonic structure would pave the way for highly integrated optical circuits and optical information processing.