Wu Bi-Yi, Sheng Xin-Qing, Hao Yang
School of Electronic Engineering and Computer Science, Queen Mary University of London, London, United Kingdom.
Center for Electromagnetic Simulation, School of Information and Electronic Engineering, Beijing Institute of Technology, Beijing, People's Republic of China.
PLoS One. 2017 Oct 5;12(10):e0185921. doi: 10.1371/journal.pone.0185921. eCollection 2017.
The design challenge of new functional composite materials consisting of multiphase materials has attracted an increasing interest in recent years. In particular, understanding the role of distributions of ordered and disordered particles in a host media is scientifically and technologically important for designing novel materials and devices with superior spectral and angular properties. In this work, the effective medium property of disordered composite materials consisting of hyperuniformly distributed hard particles at different filling fractions is investigated. To accurately extract effective permittivity of a disordered composite material, a full-wave finite element method and the transmission line theory are used. Numerical results show that the theory of hyperuniformity can be conveniently used to design disordered composite materials with good accuracy compared with those materials with randomly dispersed particles. Furthermore, we demonstrate that a Luneburg lens based on the proposed hyperuniform media has superior radiation properties in comparison with previously reported metamaterial designs and it may open up a new avenue in electromagnetic materials-by-design.
近年来，由多相材料组成的新型功能复合材料的设计挑战引起了越来越多的关注。特别是，了解有序和无序粒子在主体介质中的分布作用对于设计具有优异光谱和角度特性的新型材料和器件在科学和技术上具有重要意义。在这项工作中，研究了由不同填充分数的超均匀分布硬颗粒组成的无序复合材料的有效介质特性。为了准确提取无序复合材料的有效介电常数，使用了全波有限元方法和传输线理论。数值结果表明，与随机分散颗粒的材料相比，超均匀性理论可以方便地用于设计具有良好精度的无序复合材料。此外，我们证明，基于所提出的超均匀介质的 Luneburg 透镜与先前报道的超材料设计相比具有优异的辐射特性，并且它可能为电磁材料的设计开辟一条新途径。
