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High Sensitivity Refractive Index and Temperature sensors with Tunable Multiple Fano Resonances

In this paper, a susceptible sensor is offered, consisting of a ring-rectangular composite resonator and a metal-insulation-metal (MIM) waveguide coupled with a tube wall on the side. The transmission and sensing properties of the structure are investigated numerically by the finite element method (FEM), and the Fano resonance is found in the transmission spectrum. The results reveal several Fano resonance peaks in the transmission spectrum, and there is a linear relationship between resonant wavelength and refractive index. The Fano resonance peaks are maybe adjusted by modifying the geometric parameters of the structure. The refractive index sensitivity (S) can reach 914 nm/RIU by optimizing the structural parameters. In addition, we can obtain the temperature sensor with high sensitivity by filling ethanol in the medium, and the maximum sensitivity is 0.35 nm/°. The sensing properties of the structure can be applied to promote the research of nanoscale optical sensors in the integrated photonic devices.