A Highly Sensitive Dual Core Photonic Crystal Fiber Based on a Surface Plasmon Resonance Biosensor with Silver Graphene Layer
A highly sensitive dual core photonic crystal fiber based on a surface plasmon resonance (PCF SPR) biosensor with a silver graphene layer is described. The silver layer with a graphene coating not only prevents oxidation of the silver layer but also can improve the silver sensing performance due to the large surface to volume ratio of graphene. The dual core PCF SPR biosensor is numerically analyzed by the finite element method (FEM) An average spectral sensitivity of 4350 nm/refractive index unit (RIU) in the sensing range between 1.39 and 1.42 and maximum spectral sensitivity of 10,000 nm/RIU in the sensing range between 1.43 and 1.46 are obtained, corresponding to a high resolution of 1 x 10 6 RIU as a biosensor. Our analysis shows that the optical spectra of the PCF SPR biosensor can be optimized by varying the structural parameters of the structure, suggesting promising applications in biological and biochemical detection.
Plasmonics