Surface plasmon resonance sensor for refractive index and temperature measurement based upon a double-sided polished microstructured fiber

This paper reports a double-sided polished microstructured fiber based on the refractive index that simultaneously measures the refractive index and temperature. Two polished planes were introduced into the cladding. A gold film and polydimethylsiloxane are deposited on one side of the plane for temperature measurements, and graphene layers are coated on the surface of the silver film on the other side for refractive index measurements. The finite element method is used to characterize the sensing characteristics of the sensor. The results show that when the liquid refractive index is from 1.36 to 1.4 and the temperature from 70 degrees C to 110 degrees C, the maximum sensitivity of the sensor is 15,000 nm/RIU and 8.8 nm/degrees C, respectively. The double-sided polished structure facilitates the development of multi-parameter measurement sensors for various applications.