Hollow-core Photonic Crystal Fiber Sensor for Refractive Index Sensing

In this work, a refractive index sensor based on hollow-core photonic crystal fiber (HC-PCF) with hexagonal shaped cladding is proposed. The sensing performance of the proposed sensor is evaluated by the finite element method (FEM) for two different core geometry (circular and hexagonal) and sorbitol is used as sensing sample. Simulation results show that the proposed sensor exhibits relatively high sensitivity of 96.198 % and 94.124 % for circular and hexagonal shaped core, respectably, at operating wavelength of 1.25 µm, In addition, the confinement loss of the proposed sensor is as low as 2.24×10⁻⁰⁹ and 1.67×10⁻¹⁰ dB/m for circular and hexagonal shaped core, respectively. Owing to having good sensing performance, the proposed sensor can be competent for sorbitol sensing.