Practical sensing approach based on surface plasmon resonance in a photonic crystal fiber

A practical sensor based on surface plasmon resonance in a ring-shaped core photonic crystal fiber was proposed. A thin Au film was coated on the designed PCF, which caused the occurrence of SPR on the PCF surface and greatly simplified the measurement process. The sensor's performance has been investigated by the finite element method. The results show that the maximum wavelength sensitivity can reach 6900nm/RIU and the maximum amplitude sensitivity can reach 132RIU(-1) in the analyte refractive index range from 1.33 to 1.41. The designed sensor has many advantages, such as high sensitivity, simple operation, anti-interference, remote transmission, and self-calibration, etc. Moreover, it can work in the near infrared region, which makes it highly applicable in the biomedical domain. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement