Simultaneous Measurement of Temperature and Refractive Index Using an Ellipsoidal Extrinsic Fabry- Perot Interferometer

A novel ellipsoidal extrinsic Fabry-Perot interferometer (EEFPI) -based sensor is proposed and demonstrated. The experimental results show the sensor has a refractive index (RI) sensitivity of 77.01 dB/RIU for RI ranging at 1.3350-1.3660, while the temperature sensitivity is 225 pm/°C from 30-60°C. The excellent merits such as easy fabrication and miniature size make the proposed sensor has a potential application in the field of biochemical.