Sensitivity Measurement based on the Refractive Index Detection of Dual-Coated PCF SPR Sensor

This research article presents and investigates the gold-titanium dioxide (Au-TiO2) dual coating photonic crystal fiber (PCF) plasmonic sensor. The popularly known octagonal lattice is used to create the cladding part of the fiber, and plasmonic material coatings are used in the fiber's outer side, which provides the sensor design for fabrication prospects easier. The performance analysis is investigated by considering amplitude and wavelength for the analyte refractive index 1.375-1.400. The finite element method performs the numerical analysis at an operating wavelength from 0.9 to 1.3 mu m, respectively. The simulation result indicates that the proposed sensor achieved wavelength sensitivity and amplitude sensitivity of 20000 nm/RIU and 1847 1/RIU, respectively. Owing to the low complexity, ease to fabricate, and high sensing performance, the proposed PCF biosensor design can be associable with chemical and biological analytes.