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A refractive index sensor is a device that can convert small changes of the refractive index into an optical signal. The refractive index sensor could detect the small changes of refractive index and continuously monitor its dynamic changing process. Thus, it shows great values in detecting changes of the biochemical solutions without labeling. However, ascribed to the ohmic loss, the traditional refractive index sensor based on the noble metal usually possess low sensitivity and the figure of the merit (FOM). In this paper, an all-dielectric asymmetrical double split ring refractive index sensor with high-sensitivity and FOM is designed and numerically characterized. Here, the double split ring metamaterial structure is acted as wireless passive sensing. We used the finite element method to simulate the interaction between the incident light and the metasurface. The results show that a sharp magnetic resonance peaks could be launched caused by the all-dielectric asymmetrical double split ring. And it could greatly enhance the sensitivity and the FOM contrast to the traditional one. The results show that the resonance wavelength of the sensor is between 8270 nm - 8340 nm in the mid-infrared band. And the sensitivity and FOM of the sensor can reach 662nm/RIU and 262, respectively.
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