Silicon-photonics-based waveguide Bragg grating sensor for blood glucose monitoring
Hongqiang Li, Zhiyue Zhu, Wentao Meng, Lu Cao, Yingjie Wang, Zhilin Lin, Enbang Li, Joan Daniel Prades
Abstract
We demonstrated the design of two different structures, a two-sided structure and a top-surface structure, of glucose waveguide Bragg grating (WBG) sensors in a single-mode silicon-on-insulator (SOI) chip. A two-sided WBG structure was fabricated, and chip preparation was realized by lithography and other processes. A photonic platform for testing the two-sided WBG using glucose was built and completed. When the blood glucose concentration changed by 1 mg/mL, the two-sided WBG had a wavelength offset of 78 pm. The experimental results show that the two structures can achieve the sensing of different blood glucose concentrations. The two-sided WBG had better sensing performance and thus has a wide range of application prospects.