In this paper, a biosensor based on photonic crystal fiber (PCF) is proposed and designed usingudFull-Vectorial Finite Element Method (FVFEM). The proposed PCF sensor consists of three concentricudcircles surrounding the core. The key optical sensor characteristics such as sensitivity,udthe field profiles and real part of the refractive index of the proposed PCF structure are investigatedudby employing the FVFEM. The proposed sensor can be deployed for environmental sensingudwhen the PCF active region is filled with either analytes such as liquids or gas. By careful selectionudof the design parameters such as the radius of the sensing circle, the diameter of air holes inudthe core region and hole to hole spacing, Λ, the sensitivity analytes is determined. Our simulationudresults show that, the electric field distribution is primary localized in the third concentricudcircle with a radius of 16 μm. Effects of PCF bending on the sensitivity is also studied and reported.
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