材料科学
分散性
扫描电子显微镜
胶体晶体
胶体
电介质
平面的
衍射
结晶
透射电子显微镜
球体
表征(材料科学)
结晶学
基质(水族馆)
光学
沉积(地质)
Crystal(编程语言)
薄层
化学工程
纳米技术
化学
工程类
作者
Peng Jiang,Jane F. Bertone,Kevin S. Hwang,Vicki L. Colvin
摘要
Materials whose dielectric constant varies spatially with submicrometer periodicity exhibit diffractive optical properties which are potentially valuable in a number of existing and emerging applications. Here, such systems are fabricated by exploiting the spontaneous crystallization of monodisperse silica spheres into close-packed arrays. By reliance on a vertical deposition technique to pack the spherical colloids into close-packed silica−air arrays, high quality samples can be prepared with thicknesses up to 50 μm. These samples are planar and thus suitable for optical characterization. Scanning electron microscopy (SEM) of these materials illustrates the close-packed ordering of the spherical colloids in planes parallel to the substrate; cross-sectional SEM micrographs of the arrays as well as optical methods are used to measure sample thickness and uniformity. Normal-incidence transmission spectra in the visible and near-infrared regions show distinct peaks due to diffraction from the colloidal layer...
科研通智能强力驱动
Strongly Powered by AbleSci AI