Hybrid Polarizing Grating and TFBG based SPR Refractive Index Sensor

In this paper, we report a Surface Plasmon Resonance (SPR) Surrounding Refractive Index (SRI) sensing system based on a hybrid grating structure comprising of a 45o tilted fiber grating (TFG) and a silver coated small angle tilted fiber Bragg grating (TFBG) that have been inscribed into a single mode fiber in series. In this structure, the 45o-TFG is used as a polarizer (replacing a Polarizer Controller) to filter out the S-Polarization mode of the light, and enable the TFBG operating at the P-Polarization mode for SRI sensing. The experiment results show that the sensor covers a range between 1.33 and 1.40 refractive index units (RIU) with a sensitivity of 509.32 nm/RIU.