Novel glucose concentration sensor with unique resonance lineshapes in optical cavity

•The proposed structure with a redshift in the double Fano resonance wavelength.•The proposed structure realise a maximum double Fano sensitivity.•Produce only minor errors in concentration detection. We report the acquired of Fano resonance based on metal–insulator-metal (MIM) waveguide structure, which first consists of a branched semi-closed T-shaped waveguide coupled to an open square ring resonator, demonstrate that the Fano resonance has an highly sensitive, observe rapid detection of glucose concentration and the Fano resonance spectrum redshift with increasing the glucose level. zong These features provide a solid foundation for the application of these novel MIM structures in the field of biochemical sensing.