Surface plasmon resonance temperature sensor with tunable detection range based on a silver-coated multi-hole optical fiber

A novel surface plasmon resonance (SPR) temperature sensor based on a silver-coated multi-hole optical fiber (SMHOF) is presented. The central and surrounding air holes of the SMHOF are filled with two kinds of thermosensitive liquid with high and low refractive index (RI), respectively. Two separated resonance dips, which are related to the high and low RI filled liquid respectively, are observed at different wavelength in the transmission spectrum. Advantageously, the two dips move towards opposite direction with the temperature variation. The interval between the two SPR dips is measured under different environmental temperature and exhibits a good linearity. The proposed sensor with different detection range is fabricated by changing the RIs of the filled thermosensitive liquids. The temperature sensitivity of 7.72 nm/degrees C and-7.81 nm/degrees C is obtained in the range of 20-60 degrees C and-20-20 degrees C, respectively. Owing to the high temperature sensitivity and tunable detection range, the proposed sensor is expected to find potential applications in biomedicine, health care and environmental monitoring.(c) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

This paper presents a novel surface plasmon resonance (SPR) temperature sensor based on a silver-coated multi-hole optical fiber (SMHOF). By filling the central and surrounding air holes of the SMHOF with two different thermosensitive liquids, two separated resonance dips are observed, and they move in opposite directions with temperature variation. The interval between the two resonance dips shows good linearity and can be used for temperature detection. The proposed sensor has a high temperature sensitivity and tunable detection range, making it potentially suitable for applications in biomedicine, health care, and environmental monitoring.