基于Ag-Ta2O5双侧抛磨U型PCF-SPR折射率传感器OA

To address the issues of complex fabrication and limited detection range in existing photonic crystal fiber surface plasmon resonance sensors,a refractive index sensor based on an Ag-Ta2O5 double-sided polished U-shaped photonic crystal fi-ber surface plasmon resonance(PCF-SPR)is designed.The sensor constructs a U-shaped groove through a conventional polish-ing process,with a nano-Ag layer and a Ta2O5 protective layer sequentially coated inside the groove to enhance the coupling be-tween the core mode and the plasmon mode.Numerical simulation optimization is performed using the finite element method.Simulation results show that when the refractive index detection range is 1.16～1.36,the maximum wavelength sensitivity reaches 25,500 nm/RIU,the amplitude sensitivity reaches 736.86 RIU⁻¹,and the theoretical resolution reaches 3.92×10⁻⁶ RIU.