Abstract
In this paper, a refractive index sensor based on three circular rings coupled with a straight metal-insulator-metal (MIM) waveguide is presented. At near-infrared (NIR) spectrum, the spectral characteristics of the sensor are extensively analyzed using the finite element method (FEM). Moreover, the refractive index sensing property is comprehensively investigated by altering the design parameters. The results show a maximum sensitivity of 3573.3 nm/RIU with a figure of merit of 21.9, which is suitable for gas-sensing applications. The proposed sensor has also displayed prominent tolerance against manufacturing defects. Furthermore, the sensor proves to be highly sensitive for the label-free detection of blood components and DNA hybridization.
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