Optical sense design consisting of plasmonic and micro-cavity arrays based on Fano resonance for glucose detection.

An optical sensor is a device that can detect changes in refractive index by the light reflected from it. In this paper, by combining Fano resonance and surface plasmon resonance, we increased the performance of the optical sensor for measuring the of different glucose concentrations in water solution. Using an array of nano-hole and a Fabry-Perot resonance cavity, we propose an optical sensor to detect glucose solution with different concentrations. A triple fano resonance is created by pairing local superficial plasmon resonances of nano-hole arrays and fabry perot resonance cavities. In this case, for the three Fano peaks, the sensitivity at wavelengths of 858, 1132 and 1690 is 663, 869 and 1300 nm/RIU, respectively, and the figure of merit is 94.72, 107.35, 136.84, respectively. Due to its high sensitivity and figure of merit, this structure can be used for practical applications.