High sensitively of double-core surface plasmon resonance biosensor based on photonic crystal fiber

In this paper, a simple design of surface plasmon resonance (SPR) biosensor based on photonic crystal fiber (PCF) has been suggested. An analyte and a plasmonic material are placed at out of surface PCF, then making it appropriate for a practical applications. For a certain features, a gold (Au) using as plasmonic material. A numerical analysis by the finite element method (FEM) is applied to analyze the surface plasmons (SPs) properties of PCF-SPR biosensor. Optimization of PCF structure parameters is done, and simulation results shows a maximum wavelength sensitivity (WS) of 6700 nm/RIU (Refractive Index Unit) and an amplitude sensitivity (AS) of 2146 RIU−1 with a sensor resolution \(1.49{\times 10}^{-7}\mathrm{RIU}\) for analyte refractive index (RI) ranging (1.30–1.40). According that, the results indicate that the biosensor is highly sensitive and it can be a promising in the field of biosensing applications.