Robust and high-performance plasmonic refractive index sensor based on graphene waveguide ring resonator

In this paper, we presented a robust and high performance plasmonic refractive index (RI) sensor based on graphene plasmon waveguide coupled to graphene nano-ring resonator. We analytically derived characteristics of the RI sensor such as resonance wavelength, wavelength sensitivity and figure of merit (FoM). And we showed a possibility of a high FoM by the structural symmetry of the resonator and a close relation between structural parameters, performance of the sensor and tunable physical properties of graphene. Based on the theoretical study, we suggested that one can achieve a high-performance of the sensor, regardless of a resonant mode selection and surrounding medium change, and can also compensate the fabrication defect of the sensor by adjusting chemical potential of the graphene ring resonator and waveguide. Numerical solution confirms the robust and high performance of the RI sensor, which would be a good candidate to develop practical nanoscale integrated sensors.

Automated summary

In this paper, a robust and high performance plasmonic refractive index (RI) sensor based on graphene plasmon waveguide coupled to graphene nano-ring resonator is presented. The characteristics of the RI sensor, including resonance wavelength, wavelength sensitivity, and figure of merit (FoM), are analytically derived. The study demonstrates the possibility of achieving a high FoM through the structural symmetry of the resonator and the tunable physical properties of graphene. Based on numerical solutions, the RI sensor exhibits robust and high performance, making it a promising candidate for practical nanoscale integrated sensors.