基于二维光子晶体的甲醇浓度检测研究

Research on methanol solution concentration measurement based on 2D photonic crystal

利用光子晶体平面波展开法理论对多种晶格分布的二维光子晶体进行了数值模拟与分析。给出了计算光子带隙中心出现频率位置的理论依据,应用光子晶体平面波展开法和已有数据仿真计算出带隙中心所在频率位置与待测甲醇-水溶液浓度之间的关系。仿真计算结果表明,待测甲醇-水溶液的浓度与光子带隙中心频率之间存在线性正比例关系。该仿真实验选取溶液浓度检测范围为0.05~0.60 mol/L,为找到精准度较高、具有可应用性和实用性的模型,计算各种晶体板的填充参数来进行分析和对比,得到蜂窝形晶格光子晶体二维板应用于传感检测甲醇溶液浓度更具优势。

The photonic crystal plane wave method is used to simulate and analyze the band gap distribution of 2 D photonic crystals with different crystal lattice distributions. The theoretical basis for calculating the position of the photonic band gap center is given. The relationship between the frequency of the band gap center and the concentration of the methanol-water solution was calculated by using the photonic crystal plane wave expansion method and the existing data simulation. The simulation results show that there is an immediate linear relationship between the concentration of methanol solution and the frequency of the band gap center. The detection range of the concentration of the solution is0. 05 ~ 0. 60 mol/L. In order to find a model which has higher accuracy,practicality and applicability,the fill factors used to analyze and compare the properties of slab are computed. The final results show that honeycomb lattice photonic crystal is more useful for sensing the concentration of methanol solution.