Investigation and Optimization of the Sensitivity in a Franckeite-Based Biosensor with Bimetallic Layers
摘要
This work examines a surface plasmon resonance biosensor consisting of a BK7 prism, antireflection layer, silver, franckeite, nickel, barium titanate, black phosphorus, and sensing medium. The biosensor is designed using the Kretschmann configuration. The change in the resonance angle resulting from the refractive index change of the sensing medium from 1.330 to 1.335 is evaluated. The performance parameters of the biosensor, such as sensitivity, detection accuracy, quality factor, and figure of merit, are analyzed numerically at a monochromatic excitation wavelength of 633 nm. The effects of the number of layers and their thickness on the biosensor performance were investigated. The optimal thicknesses for enhancing the biosensor’s performance parameters were determined, and the performance parameters of the proposed optimized biosensor were compared with those reported in the literature. Our biosensor achieved a sensitivity of 518 deg.RIU−1, which is approximately 50% higher than the reported sensitivity for franckeite-based biosensors. Optimization results show that the optimal range is when the total thickness of the silver and nickel layers is between 54 and 60 nm.