Double-sided Polished Ultra-stable and Ultra-sensitive Optical Fiber Sensor

A double-sided polished photonic crystal fiber (DP-PCF) for surface plasmon resonance(SPR) sensing is designed and analyzed by using the finite element analysis software COMSOL 5.5. The suggested design shows strong sensitivity stability in the low refractive index (RI) region (1.33 similar to 1.39) and ultra-high sensitivity in the high RI region (1.39 similar to 1.43), respectively. The structural parameters of the proposed sensor are studied to analyze the stability and high sensitivity of the fiber sensor. The introduced DP-PCF sensor offers high sensitivity of 32,434 nm/RIU in the RI range of 1.39 similar to 1.43 due to its special double-sided polishing design.