A novel liquid-core photonic crystal fibre (LC-PCF) based on the Zeonex substrate has been proposed for sensing the varying concentration of kerosene in petrol and diesel fuels in terahertz frequencies. Fuel sample infiltration is achieved by designing a single hexagon in the porous core region. The LC-PCF has been numerically studied using a finite element method. By filling the core hexagon with different petrol–kerosene and diesel–kerosene concentrations, sensitivity and transmission profiles of the proposed LC-PCF have been examined. The impact of different design parameters of the fibre on its performance has been analysed, allowing the optimum design parameter set to be selected for further analysis. The proposed fibre shows relative sensitivities above 96% and effective material losses in the order of 10 ⁻³ . With negligible confinement losses, the proposed fibre demonstrates near-zero ultra-flattened group velocity dispersion profiles within 1–1.6 THz. It is envisaged that the proposed fibre may be fabricated easily due to its simple design, and thus, serving as a significant step towards understanding THz pulse interaction with liquid petrochemical products.

中文翻译：

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新型光子晶体光纤用于太赫兹频率检测煤油掺假汽油和柴油的建议

提出了一种基于Zeonex基板的新型液芯光子晶体光纤（LC-PCF），用于感测太赫兹频率下汽油和柴油燃料中煤油的浓度变化。通过在多孔芯区域中设计单个六边形来实现燃料样品的渗透。已经使用有限元方法对LC-PCF进行了数值研究。通过用不同的汽油-煤油和柴油-煤油浓度填充六边形核心，对提议的LC-PCF的灵敏度和透射率曲线进行了检查。已经分析了光纤的不同设计参数对其性能的影响，从而可以选择最佳设计参数集以进行进一步分析。提出的光纤显示出96％以上的相对灵敏度，有效材料损耗约为10 ^-3 。由于限制损耗可忽略不计，因此所提出的光纤在1–1.6 THz范围内表现出接近零的超扁平群速度色散曲线。可以设想到，由于所设计的光纤设计简单，因此可以很容易地制造它，因此，它是迈向了解THz脉冲与液体石化产品相互作用的重要一步。