探讨了光子晶体负折射效应在糖溶液浓度检测中的应用, 在软件中使用时域有限差分法对光在光子晶体中的传播进行了模拟实验。模拟显示: 糖溶液的浓度变化与输出功率变化接近线性关系, 而线性相关程度受介质柱半径常数的影响。进行了多组参数比对与优化, 最终获得了线性度最高的输出功率与糖溶液浓度的对应关系。基于这个对应关系, 提出了基于光子晶体负折射效应的糖溶液浓度检测方法并设计了相应的糖溶液浓度检测器。实验结果表明: 基于光子晶体的糖溶液浓度检测器具有结构简单、测量精度高、响应速度快、易于与激光器件集成且不受外界电磁环境影响等优点。

The application of photonic crystal negative refraction effect to the concentration detection of sugar solution was explored and a simulation experiment on light propagation in a photonic crystal was performed by Finite Difference Time Domain(FDTD) method. Simulation experiments show that the concentration change of sugar solution has a linear relationship with output power changes and the linear correlation degree is affected by medium column radius constant. The obtained multiple parameters were compared and optimized, and eventually the linearity relationship between the highest output power and the concentration of sugar solution was obtained. Based on this relation, a sugar solution concentration detection method based on photonic crystal negative refraction effect was proposed and a corresponding concentration detector was developed. Compared to other detection methods, the application of photonic crystals is characterized by a small size, long life, easy to integrate with the laser device and is not subject to external electromagnetic environment effects.