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Negative effective permeability of multilayers of ordered arrays of metal-dielectric nanosandwiches

机译：金属介电纳米三明治有序阵列多层的负有效磁导率

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摘要

We present a thorough theoretical study of the optical properties of periodic structures built of silver and silica nanodisks in a sandwich-like configuration, by means of full electrodynamic calculations using the extended layer-multiple-scattering method. The strong coupling of the metallic nanoparticles and the resulting plasmon hybridization lead to collective electric and magnetic resonant modes, which can be tuned by changing the structural parameters, such as nanoparticle size and lattice constant. We analyze the response of single- and multi-layer architectures of ordered arrays of such nanosandwiches on a dielectric substrate to externally incident light and evaluate the corresponding effective permittivity and permeability functions. Our results reveal the existence of optical magnetism, with a strong negative effective permeability over a tunable spectral range at near-infrared and visible frequencies. We introduce the complex photonic band structure as a tool in the study of three-dimensional metamaterials and establish additional criteria for the validity of their effective-medium description. Our work demonstrates the efficiency of the recently developed extended layer-multiple-scattering method in the study of metamaterials of composite metal-dielectric particles of arbitrary shape.
机译：我们通过使用扩展层-多重散射方法的完整电动力学计算，对三明治状构型的银和二氧化硅纳米盘构造的周期性结构的光学性质进行了透彻的理论研究。金属纳米粒子的强耦合和所产生的等离激元杂化导致集体的电和磁共振模式，可以通过改变结构参数（例如纳米粒子大小和晶格常数）来对其进行调整。我们分析了这种介电基板上的纳米三明治的有序阵列的单层和多层体系结构对外部入射光的响应，并评估了相应的有效介电常数和磁导率函数。我们的结果揭示了光磁的存在，在近红外和可见光频率的可调光谱范围内具有很强的负有效磁导率。我们介绍了复杂的光子能带结构，作为研究三维超材料的一种工具，并为有效介质描述的有效性建立了其他标准。我们的工作证明了最近开发的扩展层-多重散射方法在研究任意形状的复合金属-电介质颗粒的超材料中的效率。

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