A photonic crystal fiber based on a surface plasmon resonance sensor coated with segmented silver-titanium dioxide (${\rm Ag} \text{-} {{\rm TiO}_2}$) film is proposed for microfluid refractive index sensing. The sensing properties of the designed sensor are analyzed numerically by the full-vectorial finite element method. The results display that the wavelength sensitivity can be tuned by the thickness of the ${{\rm TiO}_2}$ film and segmented number and angle of the ${\rm Ag} \text{-} {{\rm TiO}_2}$ film. It is observed that an average sensitivity of 6329 nm/RIU for refractive indexes ranging from 1.330 to 1.360, and a maximum wavelength sensitivity of 10600 nm/RIU with a high wavelength resolution of ${9.43} \times {{10}^{ - 6}}\;{\rm RIU}$, can be achieved in the sensing range of 1.350 to 1.355. In addition, it also shows a maximum amplitude sensitivity of ${633.4001}\;{{\rm RIU}^{ - 1}}$, and the maximum figure of merit is 303 with ${n_a}$ varying from 1.330 to 1.360, which can be applied to the field of chemical and biological analysis.

中文翻译：

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基于表面等离子体共振传感器的分段银-二氧化钛薄膜光子晶体光纤的研究

提出了一种基于表面等离振子共振传感器的光子晶体光纤，该传感器涂覆有分段的二氧化钛银（$ {\ rm Ag} \ text {-} {{\ rm TiO} _2} $膜），用于微流体折射率传感。通过全矢量有限元方法对所设计传感器的传感特性进行了数值分析。结果表明，可以通过$ {{\ rm TiO} _2} $膜的厚度以及$ {\ rm Ag} \ text {-} {{\ rm TiO} _2} $部电影。观察到，对于折射率范围为1.330至1.360的平均灵敏度为6329 nm / RIU，最大波长灵敏度为10600 nm / RIU，且具有$ {9.43} \ times {{10} ^ {- 6}} \; {\ rm RIU} $，可以在1.350至1.355的感应范围内实现。此外，它还显示了最大幅度灵敏度$ {633.4001} \; {{\ rm RIU} ^ {-1}} $，并且最大品质因数为303，$ {n_a} $从1.330到1.360不等，可以应用于化学和生物分析领域。