Plasmon-Induced Transparency in Square Ring Resonator Structures for Optical Switch and Slow-Light Applications

In this study, we introduce an innovative plasmonic structure utilizing a Metal-Insulator-Metal (MIM) waveguide that interacts with an A symmetric square ring resonator, designed specifically for enhanced control of slow-light effects and refractive index sensing. By leveraging the phenomenon of Plasmon-Induced Transparency (PIT), our approach addresses and overcomes key limitations associated with traditional Electromagnetically Induced Transparency (EIT). Using Finite Difference Time Domain (FDTD) simulations, we explore the capabilities of this design, demonstrating significant improvements in refractive index sensitivity and notable slow-light effects. The findings highlight the potential of this structure in advancing integrated photonic devices and in applications requiring high precision. The sensitivity achieved, represented by figures of merit (FOM) for different modes, displays values of 1900, 2000, 1600, and 1600, indicating its strong performance as a versatile sensor. Additionally, when employed in slow-light applications, the group index (ng) and delay values were recorded at 95 and 34, respectively, in addition, the proposed structure has the capability to function as a sensor and switcher, along with its main function of slow light functionality, making this design a promising candidate for next-generation optical systems.