We present a generic sol-gel approach for the preparation of a distributed Bragg reflector (DBR) based on combining nanocrystalline Zn₂TiO₄ with amorphous SiO₂ xerogel films. We determined the effects of the annealing temperatures on the structural and optical properties of nanocrystalline Zn₂TiO₄ films. The increasing size of nanocrystals and film's density caused a regular growth of the films' refractive indices at 632 nm from the value of 1.837–1.960. The acquired data were applied to design the DBR with tailored reflectance at 980 nm and the data predicted by the theoretical model were compared with experimental transmission and reflection spectra. Although the high optical losses caused by the Rayleigh scattering were observed at short wavelengths, the prepared films were fully transparent above 600 nm. The uniform dielectric structure reflecting over 97% of incident light at 980 nm was prepared from eight Bragg's pairs. The normalized spectral bandwidth was about 0.22. We proved the nanocrystalline films exhibiting scattering in UV-VIS spectral region can be used for the construction of the distributed Bragg's reflectors operating in near infrared region. The presented approach can be easily extended to other nanocrystalline films allowing the integration of nanocrystalline luminophores into advanced photonic structures.

我们提出了一种基于结合纳米晶体Zn ₂ TiO ₄与无定形SiO ₂干凝胶薄膜的分布式布拉格反射器（DBR）的通用溶胶-凝胶方法。我们确定了退火温度对纳米晶Zn ₂ TiO ₄的结构和光学性质的影响电影。纳米晶体尺寸的增加和薄膜密度的增加导致薄膜在1.83–1.960的值在632 nm处有规律地增长。将获得的数据用于设计具有980 nm反射率的DBR，并将理论模型预测的数据与实验透射和反射光谱进行比较。尽管在短波长下观察到了由瑞利散射引起的高光学损失，但制得的薄膜在600 nm以上是完全透明的。由八个布拉格对制备了反射超过97％的980 nm入射光的均匀介电结构。归一化的光谱带宽约为0.22。我们证明了在UV-VIS光谱区域表现出散射的纳米晶体薄膜可用于构建分布式Bragg' s反射器在近红外区域工作。所提出的方法可以容易地扩展到其他纳米晶体膜，从而允许将纳米晶体发光体整合到先进的光子结构中。