Plasmon-Induced Transparency and Refractive Index Sensing Based on a Trapezoid Cavity Coupled with a Hexagonal Resonator

Abstract

Tunable plasmon-induced transparency (PIT) effect is studied in a plasmonic device on the basis of the metal-insulator-metal (MIM) structure which consists of trapezoid and hexagonal cavities. The transmission characteristics are numerically studied in detail by the finite element method (FEM). Diverse geometrical parameters were altered to evaluate the characteristics of the structure, and the coupled mode theory (CMT) is utilized to verify the simulation results. The sensing characteristics of the device could also be analyzed by the simulative results which achieved from the transmission spectra. The structure we proposed has the capacity and potential to be utilized on integrated optical circuit field.