Design and Optimization of a Dual-Core GoldCoated PCF-SPR Biosensor for Biosensing Applications

Photonic Crystal Fiber based Surface Plasmon Resonance (PCF-SPR) is a biosensing technology that combines PCF and SPR to detect refractive index (RI) changes with high sensitivity.This study investigates a novel dual-core PCF-SPR biosensor, designed to cover the RI range of 1.31 to 1.40, enhancing sensitivity and resolution for high-performance biosensing applications.It also focusing on key performance metrics, including wavelength sensitivity (WS), amplitude sensitivity (AS), and figure of merit (FOM), while minimizing confinement loss (CL).The methodology employs COMSOL Multiphysics using the Finite Element Method (FEM) for numerical analysis, investigating the effects of geometrical parameters on CL, AS, and WS.The results demonstrate a maximum WS of 8000 nm/RIU, an AS of -1279.38 1/RIU, a competitive resolution of 1.25 10 RIU, and an impressive FOM of 250 RIU, which significantly outperform previous models.This biosensor presents an innovative and effective solution for biosensing applications, providing exceptional performance in the target RI range and demonstrating a strong potential for practical use in medical diagnostics and other biosensing fields.