Abstract

A compact all-fiber temperature sensor based on a gold nanoparticle (GNP)-coated macrobent standard single-mode fiber (SMF) has been proposed and experimentally demonstrated. It can be easily constructed by just bending an SMF into a suitable bending radius to constitute a Mach–Zehnder modal interferometer. The sensing area of the bent SMF was coated with GNP utilizing the magnetron sputtering technique. Different tuned GNP thicknesses of ∼10, 20, and 30 nm were deposited on different bent fibers and the temperature-sensing performance was examined experimentally. Throughout the experiments, the wavelengths of the monitored interference dips decreased gradually and were blueshifted with an increase in temperature in the range of 35°C to 47°C. Among the three coated sensing heads, the proposed sensor coated by an ∼20-nm layer thickness of GNP showed the best performance with excellent sensitivity, fast rise time, and an excellent resolution of −2.56 nm / °C, 1.73 ms, and 1.82 × 10 − 4°C, respectively. Benefiting from its excellent advantages of simple configuration, easy fabrication, and high mechanical strength, this high-sensitivity temperature sensor could be a competitive candidate for precise temperature measurement of the human body.

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