Very high sensitivity of one dimensional photonic crystal biosensor for glucose monitoring

This paper investigates a one-dimensional (1D) photonic crystal (PhC) based optical sensor. Three defect air layers filled with glucose solution separated by two thin cells of titanium dioxide (TiO
2
) are used as sensing regions. The sensing principle is based on the transmission peak shifts caused by the analyte refractive index (RI) change. Using the transfer matrix method (TMM), the effects of the temperature and the glucose concentration on the resonant wavelength are analyzed. The analysis found that our designed device offers a high sensitivity of 993 nm×RIU
⁻¹
and a quality factor of 1.314×10
⁶
• Moreover, the developed biosensor has a simple design, and it can be a promising platform for RI based glucose sensing.