Hybrid Cladding Structured Gold Coated Photonic Crystal Fiber Biosensor Based on Surface Plasmon Resonance

Abstract

This paper presents a hybrid cladding structured gold coated photonic crystal fiber (PCF) biosensor based on surface plasmon resonance (SPR). The performance of the proposed biosensor is analyzed by using finite element method (FEM) based software and MATLAB software environment. In the proposed SPR based PCF biosensor, plasmonic material and sensing layer are placed on the outer layer of the PCF to meet the fabrication challenge. The proposed SPR based PCF biosensor exhibits the wavelength sensitivity of 4500 nm/RIU, amplitude sensitivity of 347 RIU−1, sensor resolution of 2.22 × 10-5 RIU and high degree of linearity with the sensing ranges from analyte refractive index (RI) of 1.35 to 1.38. Considering high sensitivity, high sensor resolution and high linearity, this proposed SPR based PCF biosensor can be a promising candidate for unknown analyte detection.