Modeling and simulating of unclad fiber-optic biosensor based on localized surface plasmon resonance
摘要
An unclad single mode fiber-optic sensor operating at 650 nm was designed and simulated by using COMSOL MULTIPHYSICS Finite Element Method and utilized the effect of surface plasmon resonance of the gold nanoparticle (Au NP). Au NPs (40 nm thickness) were deposited on the fiber core. The fiber then is immersed in different liquids of different refractive indices (air, water, colon tissue, and liver tissue) at the thickness of (3 μm). The performances of the sensor were determined at analyte refractive index range from na = 1.00027632 to 1.3753. The wavelength sensitivity and resolution of the sensor was found to reached its maximum at 4301.07527(nm/RIU) for colon tissue with the resolution of 2.33 × 1 0–5 (RIU).