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光子晶体由于具有光子带隙和光子局域等一系列优异的光学特性而受到了人们广泛的关注。由于采用胶体颗粒自组装法制备光子晶体制备工艺简单,所需要的费用也较低,因此已成为制备可见光至红外波段三维光子晶体的一种简便有效的方法。采用垂直沉积法制得了三维光子晶体薄膜,并用扫描电子显微镜和紫外-可见光-近红外分光光度计对其显微结构和光学特性进行了详细的研究。结果表明,自组装薄膜在三维方向上都具有有序结构,其密排面平行于载波片的表面。制备的光子晶体薄膜具有明显的光子带隙特性,带隙中心波长为956nm。研究了带隙中心波长同入射线与密排面法线夹角之间的变化关系,其结果与理论值吻合得很好。
Photonic crystals have received wide attention due to their excellent optical properties such as photonic bandgap and photon localization. The preparation of photonic crystals by colloidal particle self-assembly method is simple and cost-effective. Therefore, it has become a simple and effective method for preparing three-dimensional photonic crystals in the visible to infrared band. Three-dimensional photonic crystal films were prepared by vertical deposition method. The microstructure and optical properties of the films were studied in detail by scanning electron microscopy and ultraviolet-visible-near-infrared spectroscopy. The results show that self-assembled thin films have an ordered structure in three-dimensional directions, and their close-packed planes are parallel to the surface of the carrier. The prepared photonic crystal film has obvious photonic bandgap characteristic, the bandgap center wavelength is 956 nm. The relationship between the center wavelength of the band gap and the normal angle between the incident line and the close-packed surface is studied. The result is in good agreement with the theoretical value.