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探讨了光子晶体光纤带隙宽度测量法在溶液质量摩尔浓度检测中的应用。数值模拟中利用平面波展开法计算了二维各向同性的不同介质圆柱组成的三角晶格光子晶体光纤的带隙和带宽。选择二维三角晶格光子晶体材料硅(Si)作为基底,在空气孔内填充待测质量摩尔浓度不同的溶液材料,得到了溶液填充的光子晶体光纤在不同偏振模式下的禁带宽度。模拟显示:溶液的浓度变化与光子晶体带隙宽度或输出功率变化接近线性关系,而线性相关程度受填充空气孔内液体质量摩尔浓度的影响,进行了多组参数比对与优化,最终获得了线性度最高的禁带宽度或输出功率与糖溶液质量摩尔浓度的对应关系.基于这个对应关系,提出了基于光子晶体带隙宽度测量的溶液浓度检测方法。
The application of photonic crystal fiber band gap width measurement in the detection of molar mass concentration was discussed. In the numerical simulation, the bandgap and bandwidth of triangular lattice photonic crystal fiber composed of different dielectric cylinders with two-dimensional isotropy were calculated by plane wave expansion method. The two-dimensional triangular lattice photonic crystal silicon (Si) is selected as the substrate, and the air holes are filled with solution materials with different molar concentrations to obtain the forbidden band width of the solution-filled photonic crystal fiber under different polarization modes. The simulation results show that the concentration of the solution changes linearly with the change of band gap or output power of the photonic crystal, and the linear correlation is affected by the molar concentration of liquid in the filled air pores. The linearity of the maximum forbidden band width or the output power and the molar mass of the molar concentration of sugar solution.Based on this correspondence between the photonic crystal band gap based on the measurement of the concentration of the detection method.