泡沫作为自组装非晶光子带隙材料
Foam as a self-assembling amorphous photonic band gap material
摘要：
我们发现，轻微的多分散无序的二维泡沫可以用作自组装模板的各向同性光子带隙（PBG）材料的横向电（TE）极化。基于内部实验和模拟泡沫结构的计算表明，在足够的折射率对比度下，具有三重节点和细长平台边界的干泡沫组织特别有利于打开大的PBG。从干泡沫结构到湿泡沫结构的转变主要通过形成更大的四重节点来快速关闭PBG，用缺陷模式填充PBG。通过调整泡沫面积分数，我们找到了一个最佳的介电材料的数量，最大限度地提高实验系统中的PBG。所获得的结果有可能扩展到3D泡沫，以产生下一代自组装无序PBG材料，从而能够制造廉价且可扩展的光子器件。
英文摘要：
We show that slightly polydisperse disordered 2D foams can be used as a self-assembled template for isotropic photonic band gap (PBG) materials for transverse electric (TE) polarization. Calculations based on in-house experimental and simulated foam structures demonstrate that, at sufficient refractive index contrast, a dry foam organization with threefold nodes and long slender Plateau borders is especially advantageous to open a large PBG. A transition from dry to wet foam structure rapidly closes the PBG mainly by formation of bigger fourfold nodes, filling the PBG with defect modes. By tuning the foam area fraction, we find an optimal quantity of dielectric material, which maximizes the PBG in experimental systems. The obtained results have a potential to be extended to 3D foams to produce a next generation of self-assembled disordered PBG materials, enabling fabrication of cheap and scalable photonic devices.
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