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 × 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.