Effect of disorder on the optical properties of colloidal crystals
Effect of disorder on the optical properties of colloidal crystals
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DOI：
10.1103/physreve.71.016615
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发表时间：
2005-01-01
影响因子：
2.4
通讯作者：
Colvin, V
中科院分区：
文献类型：
--
作者：
Rengarajan, R;Mittleman, D;Colvin, V
胶体晶体为三维光子晶体的形成提供了一条有前途的途径。使用这些材料的主要限制是这些自组装材料中存在的无序性。球空位、线位错和随机位置误差都会导致光学性能下降。表征这些效应对于指导胶体晶体光学的进一步发展非常重要。在这里，我们报告了对具有可见衍射特性的胶体晶体无序的系统和定量研究。利用光谱学和数字成像，我们将结构紊乱的几种测量方法与透射和反射光学特性的变化相关联。我们观察到上面的临界尺寸分布，观察到最低阻带的快速恶化。低于这个临界尺寸分布，我们观察到优异的光学质量，几乎与尺寸分布无关。在由更多的多分散球体形成的晶体中，单球体空位也会增加。此类缺陷的主要影响是增加宽带漫散射。
Colloidal crystals offer a promising route for the formation of three-dimensional photonic crystals. The primary constraint in working with these materials is the disorder present in these self-assembled materials. Sphere vacancies, line dislocations, and random position errors all lead to a degradation in the optical properties. It is important to characterize these effects so as to guide further developments in colloidal crystal optics. Here, we report a, systematic and quantitative study of disorder in colloidal crystals with visible diffractive properties. Using optical spectroscopy and digital imaging we have correlated several measures of structural disorder with variations in the transmissive and reflective optical properties. We observe a critical size distribution above, which rapid deterioration of the lowest stop band is observed. Below this critical size distribution, we observe excellent optical quality, nearly independent of the size distribution. Single sphere vacancies also increase in crystals formed from more polydisperse spheres. The primary effect of this type of defect is to increase the broadband diffuse scattering.