Sensitive biosensing based on a D-type photonic crystal fiber

Abstract

Abstract We designed a D-type photonic crystal fiber biosensor based on surface plasmon resonance, verified the simulation results of the existing glucose concentration in the blood of diabetic patients, and used the finite element simulation software COMSOL for numerical simulation. The influence of structural parameters of the biosensor on the sensing performance is mainly studied. The maximum wavelength sensitivity of the sensor is 42000 nm RIU–1, maximum figure-of-Merit (FOM) of 429.61 RIU−1, linearity is 0.99607, and wavelength resolution is 3.33 × 10−6 RIU in the refractive index range of 1.29–1.37. The biggest highlight of this sensor is not only the simple design structure and ultra-high sensitivity, but also when the diameter of the outermost air hole changes from 0.3 μm to 1.15 μm, it does not affect the phase matching conditions of the coupling mode inside the fiber. We believe that this sensor is expected to be the most competitive instrument among biosensors.