Research on photonic crystal fiber based on a surface plasmon resonance sensor with segmented silver-titanium dioxide film

A photonic crystal fiber based on a surface plasmon resonance sensor coated with segmented silver-titanium dioxide ( A g - T i O 2 ) film is proposed for microfluid refractive index sensing. The sensing properties of the designed sensor are analyzed numerically by the full-vectorial finite element method. The results display that the wavelength sensitivity can be tuned by the thickness of the T i O 2 film and segmented number and angle of the A g - T i O 2 film. It is observed that an average sensitivity of 6329 nm/RIU for refractive indexes ranging from 1.330 to 1.360, and a maximum wavelength sensitivity of 10600 nm/RIU with a high wavelength resolution of 9.43 × 10 − 6 R I U , can be achieved in the sensing range of 1.350 to 1.355. In addition, it also shows a maximum amplitude sensitivity of 633.4001 R I U − 1 , and the maximum figure of merit is 303 with n a varying from 1.330 to 1.360, which can be applied to the field of chemical and biological analysis.