Numerical analysis of a highly sensitive SOI MRR refractive index sensor with performance enhancement using graphene and gold

Abstract

This study presents an innovative approach to designing an SOI ring resonator with enhanced sensing capabilities. Through meticulous optimization, we achieved an impressive figure of merit (FOM) of 56.15, indicating the remarkable efficiency of the device. Moreover, by incorporating a graphene layer atop the SiO2 substrate, we effectively improved the interaction of light with the material, resulting in a notable sensitivity of 730 nm/RIU. To further enhance the sensor properties, we employed a plasmonic effect strategy by strategically placing a gold nano disk at the center of the ring structure on the graphene layer. Utilizing the FDTD method, we conducted comprehensive simulations to evaluate the performance of the proposed device in terms of sensitivity and FOM. The outstanding sensitivity of the device to changes in refractive index, as demonstrated by the simulation results, makes it a compelling choice for a wide range of sensing applications. The proposed design not only serves as a valuable blueprint for device fabrication but also paves the way for its practical implementation in real-world scenarios.