Dual‐channel glucose concentration sensor based on coupled cross‐stacked gratings

Abstract

A dual-channel glucose concentration sensor based on coupled cross-stacked gratings is proposed. When the concentration of glucose solution is varied from 30 to 60 g/100 ml, the maximum values of the bulk sensitivity for peaks at longer and shorter resonance wavelength indicate approximately 615.57 and 262.94 nm/ RIU, respectively. Therefore, the sensitivity of channel at longer wavelength is increased by 234.42% compared with that of the shorter wavelength. Advantageously, the dual-channel sensor with different sensitivities can reduce measurement errors and noise effectively such as background noise and the fluctuation of the light source.