Surface Angle Effect on Sensing Performance of the V-Shaped SPR Photonic Crystal Fiber for theDetection of Refractive Index

Abstract

A V-shaped sensing surface photonic crystal fiber sensor based on surface plasmon resonance is designed and investigated numerically in the refractive index detection range of 1.32 to 1.41 by applying the finite element method. The V-shaped surface can reduce the distance between the fiber core and the analyte, which enhances the coupling between surface plasmon mode and the fundamental core mode. The effect of the surface angle of the proposed sensor on the mode characteristics and sensing performances is analyzed in detail. The simulation results show that the surface angle of the PCF has a remarkable influence on the sensitivity of the sensor and detection range of the analyte retractive index. This sensor offers maximum sensitivity of 14000 nm/RIU which is approximately 55% larger than the other similar structure for the surface angle of 160o without sacrificing the detection range of the analyte refractive index. The above analysis and results demonstrate that this sensor is feasible and promising in environmental, biological, and chemical sensing. © 2024 IAMOT