Plasmonically induced reflection in MIM plasmonic waveguide resonator system

Plasmonically induced reflection (PIR) is numerically achieved based on bright-dark coupling mechanism in plasmonic waveguide resonator system. The system consists of a rectangle cavity side-coupled to a metal-dielectric-mental (MIM) waveguide coupled with a ring. The transmission properties of the system are simulated by the finite-difference time-domain (FDTD) method and theoretically explained by the three-level atomic system theory. The results show that the PIR window can be tuned vertically and horizontally, respectively. In addition, double PIR windows appear in the original broadband absorption window by adding another side-coupled rectangle cavity, and the physical origin is presented. Obviously, our structures have potential application for optical switching, filter and spectral splitter in highly integrated optical circuit.