Petal-type refractive index sensor based on Fano resonance

In this paper, we propose a novel nano-scale refractive index sensor consisting of a MIM waveguide and a Petal with flower-core ring resonator (PWFCRR). The sensing performance of the petal-like structure was reasonably analyzed by using the finite element analysis method combined with the Fano resonance phenomenon in the optical process. After adjusting the structural parameters, the petal-like structure with the optimal sensing performance was obtained by comparison. Further simulation results show that the sensitivity of the final petal-like structure is as high as 2000nm/RIU, and the figure of merit (FOM) of the system is 47.62. This will provide a new option for high-precision refractive index measurement, which has extraordinary prospects in the field of optical detection.