Highly Sensitive Photonic Crystal Fiber Sensor for Liquid Detection

A highly sensitive simple photonic crystal fiber sensor for liquid detection of water, ethanol and benzene, has been proposed and numerically analysis using a full vector finite element method. The proposed structure consists of a hexagonal core hole and 3 cladding air hole rings, operating in the lower optical region of 0.6 to 2.0 µm. It has been shown that the proposed structure have a high relative sensitivity, low confinement loss and low effective area; with the proposed structure operating in single mode for all liquid analytes. The results have demonstrated the applicability of the proposed structure for liquid detection sensing application.