Photonic crystals based on anodic aluminum oxide films are examined as refractive index sensors for controlling the composition of water-alcohol liquid mixtures. The position of the reflectance maximum corresponding to the first photonic stop band is used as the analytical signal. Impregnation of a photonic crystal with water-ethanol and water-glycerol mixtures results in a redshift of the reflectance maximum. A fairly high refractive index sensitivity, sufficient to determine the composition of water-ethanol and water-glycerol mixtures with an accuracy of about 1 wt.%, is observed. The detailed dependencies of the analytical signal on the composition of mixtures are experimentally investigated and compared with numerical calculations. Prospects and limitations of the refractive index sensors based on anodic alumina photonic crystals are discussed.

中文翻译：

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阳极氧化铝光子晶体作为折射率传感器，用于控制液体混合物的组成

研究了基于阳极氧化铝膜的光子晶体作为折射率传感器，用于控制水-醇液体混合物的成分。对应于第一光子阻带的最大反射率的位置用作分析信号。用水-乙醇和水-甘油混合物浸渍光子晶体会导致反射率最大值发生红移。观察到相当高的折射率敏感性，足以确定水-乙醇和水-甘油混合物的组成，其准确度约为1重量％。实验研究了分析信号对混合物组成的详细依赖性，并与数值计算进行了比较。讨论了基于阳极氧化铝光子晶体的折射率传感器的前景和局限性。