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The selection of a suitable plasmonic material is extremely crucial forachieving high-performance photonic crystal fiber-based surface plasmonresonance (PCF-SPR) sensors. However, most numerical investigations to date arelimited to PCF-SPR sensors with conventional circularly coated plasmonic metalsdue to their availability and rigid properties. In this work, a single-corearc-shaped photonic crystal fiber is designed and studied with sensingingredients coated outside the fiber. The simulation and numerical analyseswere performed using the full-vector finite element method (FV-FEM) to examinethe effects of using gold as active metal and also the deposition of $Ta_2 O_5$on gold. The results show that the arc-shaped sensor with gold film can obtainthe maximum wavelength interrogation sensitivity (WIS) of 9500 nm/RIU withinthe refractive index (RI) range of 1.25 to 1.39 while the maximum amplitudeinterrogation sensitivity (AIS) is reached 579.26 $RIU^{-1}$ at 1.39 andresolution is found to be 1.05 x ${10^{-5}}$. However, depositing $Ta_2 O_5$ onthe gold gives an improved maximum WIS and AIS of 22000 nm/RIU, and 1209.21$RIU^{-1}$, respectively. With the coating of $Ta_2 O_5$, the resolutionimproves to 4.55 x ${10^{-6}}$ making the proposed sensor design undoubtedlyeffective in detecting different biological samples with a wide range of RI.

Design and Analysis of Arc-Shaped Single Core Photonic Crystal Fiber Sensor Based on Surface Plasmon Resonance