Polymer-based cascaded waveguide Bragg grating for blood glucose sensing

• Ruina Zhao, Hongqiang Li, MING Han, Mingjun Ding, Licheng Zuo, Lizhen Zhang, shanshan zhang, Wentao Meng, Fanglin Xie, Shuai Ma, Lu Cao, Feng Ren, Enbang Li, and Juan Daniel Prades Garcia
• received 03/11/2024; accepted 04/09/2024; posted 04/10/2024; Doc. ID 523504
• Abstract: Waveguide Bragg grating (WBG) blood glucose sensing, as a biological sensing technology with broad application prospects, plays an important role in the fields of health management and medical treatment. In this work, a polymer-based cascaded WBG is applied to glucose detection. We investigated photonic devices with two different grating structures cascaded, a crossed grating and a bilateral grating, and analyzed the effects of the crossed grating period, the bilateral grating period, and number of grating periods on the sensing performance of the glucose sensor. Finally, the reflectance spectral characteristics, response time and sensing specificity of the cascaded WBG were evaluated. The experimental results show that the glucose sensor has a sensitivity of 190 pm/(mg/ml) in the glucose concentration range of 0-2 mg/ml and has the advantages of high integration, a narrow bandwidth and low cost.