论文标题
三维随机介电胶体超材料与巨型各向同性光学活性
Three-dimensional random dielectric colloid metamaterial with giant isotropic optical activity
论文作者
论文摘要
由理论观察到，即使在完全随机的系统中也可以存在理论观察，我们设计了一个由随机的元原子胶体组成的介电的超材料，该元素表现出了前所未有的高各向同性光学活性。每个元原子都由一个旋转式硅纳米球组成。这样的簇可以通过大规模的DNA自组装技术来制造。证明在胶体中使用高浓度的元原子可提供明显的不连贯散射损失的抑制作用。结果，与先前的超材料设计相比，提出的系统显示了各向同性光学活性的三个数量级改善。这项工作突出了完全随机系统（通常是胶体科学中产生的）的重要潜力，该系统是针对新型光子效应和设备的超材料的应用。
Motivated by the theoretical observation that isotropic chirality can exist even in completely random systems, we design a dielectric metamaterial consisting of a random colloid of meta-atoms, which exhibits unprecedentedly high isotropic optical activity. Each meta-atom is composed of a helically arranged cluster of silicon nanospheres. Such clusters can be fabricated by large-scale DNA self-assembly techniques. It is demonstrated that the use of a high concentration of the meta-atoms in the colloid provides significant suppressions of incoherent scattering losses. As a result, the proposed system shows three orders of magnitude improvement of isotropic optical activity as compared with the previous metamaterial designs. This work highlights the significant potential of completely random system, which are commonly produced in colloidal sciences, for applications as metamaterials towards novel photonic effects and devices.
