Abstract 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 1.49×10-7RIUdocumentclass[12pt]{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} begin{document}$$1.49{times 10}^{-7}mathrm{RIU}$$end{document} 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.
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