Numerical Analysis of Highly Sensitive D-Shaped PCF SPR Temperature Sensor

This numerical study presents an investigation of an optical fiber D-shaped PCF SPR sensor for temperature sensing, via the finite element method-based COMSOL Multiphysics simulation software. In the proposed PCF configuration, the sensor consists of two different-sized air holes and a gold layer. Between 10°C and 60°C, pure ethanol and an ethanol-chloroform mixture are selected to be used as analytes and their temperature sensitivities are compared. The effect of sensor parameters on sensor sensitivity is studied, and the optimum value is set for each parameter. The maximum sensitivity is calculated as 2008 pm/℃ for the pure ethanol, while it has reached 7750 pm/℃ for the ethanol-chloroform mixture, showing that chloroform improves the performance. The sensor proposed in this study has a higher temperature sensitivity compared to other studies and therefore has significant potential for applications requiring precise measurement