Ricouvier Joshua, Tabeling Patrick, Yazhgur Pavel
Microfluidique, MEMS et Nanostructures, Institut Pierre-Gilles de Gennes, Ecole Supérieure de Physique et de Chimie Industrielles de la Ville de Paris, CNRS, Paris Sciences et Lettres (PSL) Research University, 75005 Paris, France
Microfluidique, MEMS et Nanostructures, Institut Pierre-Gilles de Gennes, Ecole Supérieure de Physique et de Chimie Industrielles de la Ville de Paris, CNRS, Paris Sciences et Lettres (PSL) Research University, 75005 Paris, France.
Proc Natl Acad Sci U S A. 2019 May 7;116(19):9202-9207. doi: 10.1073/pnas.1820526116. Epub 2019 Apr 24.
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.
我们表明，略微多分散的无序二维泡沫可作为横向电（TE）极化的各向同性光子带隙（PBG）材料的自组装模板。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普朗特边界的干泡沫结构对于打开大的光子带隙特别有利。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、用缺陷模式填充光子带隙而迅速关闭光子带隙。通过调整泡沫面积分数，我们找到了介电材料的最佳用量，这在实验系统中使光子带隙最大化。所获得的结果有可能扩展到三维泡沫，以生产下一代自组装无序光子带隙材料，从而实现廉价且可扩展的光子器件制造。
