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

Abstract

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 °C to 110 °C, the maximum sensitivity of the sensor is 15,000 nm/RIU and 8.8 nm/°C, respectively. The double-sided polished structure facilitates the development of multi-parameter measurement sensors for various applications.

Keywords:

• Microstructured fiber
• refractive index
• sensitivity
• surface plasmon resonance sensor
• temperature

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China (grant nos. 61775032 and 11604042); the Fundamental Research Funds for the Central Universities, China (grant nos. N170405007 and N160404009); and the 111 Project (grant no. B1009).