Research on Half -Polished Surface Plasmon Resonance –Photonic Crystal Fiber Refractive Index Sensor (Hp-Spr-Pcf)

Numerical design proposes a half-polished, surface plasmon resonance-based photonic crystal fiber sensor (HP-SPR-PCF). Composite thin metal-fluoride layer (Ag+NaF) activates the plasmon condition in the nano scale (50 nm) region at the PCF flat surface. This bi-layer thin film coating avoids polluting the liquid analyte and improves the plasmon-photon interaction process in the PCF flat surface. The high-quality silicone rubber-coated glass fabric (SF7) is a core material to maintain a high refractive index (RI =1.63) in the fiber core. The full-vector finite element method (FV-FEM) mathematical tool is used in this sensor for sensing the RI Range of 1.33 to 1.34. The numerical result indicates high wavelength sensitivity (10,000 nm/RIU) and low loss (0.1 dB/cm) in the Mid-C-band region (1550 nm). Hence, this sensor is applicable in remote sensing applications due to its low attenuation and the highest peak gain in the C-band.