Design of a Dual Cluster and Dual Array-Based PCF-SPR Biosensor with Ultra-high WS and FOM

This manuscript demonstrates a uniquely designed microstructured dual cluster and dual array-based photonic crystal fiber (PCF) surface plasmon resonance (SPR) biosensor, which shows a very high sensitivity. The sensor performance has significantly been improved due to the judicious disposition of the circular air holes with silica as the fiber material, which is bounded by successive layers of TiO2 and gold (Au). The layer of TiO2 increases the sensitivity, and it also increases the adhesiveness of Au with the fiber. We utilized the finite element method (FEM) of COMSOL Multiphysics for evaluating the surface plasmon properties of our biosensor. After numerical investigation, the results have shown the maximum amplitude sensitivity of 3807 RIU−1, the maximum wavelength sensitivity of 80,500 nm/RIU, the maximum sensor resolution (wavelength) of 1.24 × 10−6 RIU, and the maximum sensor resolution (amplitude) of 2.63 × 10−6 RIU, and the maximum figure of merit (FOM) was found to be 2115. We believe that our proposed SPR-based PCF biosensor will bring about a significant advancement in the sector of sensing applications like the detection of unknown biochemical and biological analytes.