Finite Element Method Based Design Analysis of Internal Coated and External Coated PCF Temperature Sensor

In this paper, we demonstrate and evaluate the performance of air filled spiral design photonic crystal fiber (PCF) temperature sensor and double core PCF based temperature sensor. In the first design, selective air holes are filled by temperature sensitive liquid and coated with gold layer to improve the performance of the sensor. In the second design, the high temperature coefficient liquid and plasmonic material are deposited outside portion of the double core PCF to make the fabrication easier. Besides, the coupling phenomenon is studied. The Matlab environment as well as the finite element method (FEM) are utilized to demonstrate the sensor performance. Variation of temperature leads different loss spectra that has been analyzed. The computer simulation result indicate that the obtained wavelength sensitivity of the air filled spiral PCF is as high as 585 pm/°C for y-polarization light and for dual core PCF the sensitivity is increased up to 970 pm/°C and 1075 pm/°C for x and y-polarized light, respectively for wide detection range of temperature 0°C to 80°C. In addition, the variation of structural parameter such as metal thickness and air holes are investigated on the performance of the sensor sensitivity. Considering high sensitivity and low fabrication complexity, the dual core PCF temperature sensor may be a better option to monitor or check the temperature of manufacturing industry, medical environment, transformer oil, battery of electric vehicles and so on.