Liquid crystal based tunable plasmonic induced reflection in MIM waveguide coupled with a disk resonator

Abstract

In this paper, plasmon induced reflection effect is achieved in a simple structure, which composed of a rectangle resonator and a disk resonator coupled to the metal-insulator-metal (MIM) waveguide. Liquid crystal (LC) material is incorporated in the rectangular resonator to tune the plasmon resonance. The transmission properties and field distribution are simulated by two dimensional finite difference time domain (FDTD) method and theoretically explained by coupled mode theory (CMT). The result of FDTD and CMT agrees well and it show that the plasmon induced reflection resonance can be tuned by geometrical parameters or the director angles of LC. The proposed plasmonic structure may have application in slow light device, optical switch, highly integrated optical circuit and other related plasmonic devices.