Abstract
In this article, a temperature and refractive index sensing probe based on a photonic crystal fiber (PCF) with a silver film coating is proposed. We suggested a simple method for coating silver films, and a silver film was coated on the periphery of the PCF that solves the previous difficulties of coating metal film inside the air holes or polishing a flat surface. The sensing probe has achieved dual-parameter sensing of refractive index and temperature by employing polydimethylsiloxane (PDMS) as the temperature-sensitive material. The results of the experiment demonstrated that the wide measurement range and high sensitivity of the sensing probe. It has a refractive index sensitivity of 3341.65 nm/unit of refractive index (RIU) in the range of 1.333–1.3953 and a temperature sensitivity of 2.02 nm/°C in the range of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$50-100\,\,^{\circ }\text{C}$ </tex-math></inline-formula> . The features of the suggested sensing probe, including its simple structure and ease of production, indicate the potential application in the field of biochemical sensing.
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