Design and simulation of Surface Plasmon Resonance based Solid Core Photonic crystal fiber biosensor

The purpose of a surface plasmon resonance (SPR)-based photonic crystal fiber (PCF) biosensor is to achieve a maximal sensitivity for the detection of unknown analytes. Outside of the PCF, the chemically stable and inert plasmonic material gold (Au) was utilized. A solid core photonic crystal fibre (SC-PCF) with an endlessly single-mode was designed in this work, with both the centred core and holes in the cladding structured by circles. The SC-PCF was designed with a single solid center core surrounded by a six-ring hexagonal cladding. SC-PCF was measured utilizing the finite element method (FEM) and the perfectly matched layer (PML) boundary condition. The FEM was used to investigate the performance using COMSOL Multiphysics software. The proposed biosensor shows  amplitude sensitivity of (167 to 886.38) RIU−1  within the sensing range of (1.3435 to 1.3471). Due to structural simplicity and excellent sensing properties, the proposed PCF can be regarded as a good biosensor.