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首页> 外文期刊>Physical review >Diffractive arrays of gold nanoparticles near an interface: Critical role of the substrate
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Diffractive arrays of gold nanoparticles near an interface: Critical role of the substrate

机译：界面附近的金纳米粒子的衍射阵列：衬底的关键作用

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摘要

The optical properties of periodic arrays of plasmonic nanoantennas are strongly affected by coherent multiple scattering in the plane of the array, which leads to sharp spectral resonances in both transmission and reflection when the wavelength is commensurate with the period. We demonstrate that the presence of a substrate (i.e., an asymmetric refractive-index environment) can inhibit long-range coupling between the particles and suppress lattice resonances, in agreement with recent experimental results. We find the substrate-to-superstrate index contrast, and the distance between the array and the interface to be critical parameters determining the strength of diffractive coupling. Our rigorous electromagnetic simulations are well reproduced by a simple analytical model. These findings are important in the design of periodic structures and in the assessment of their optical resonances for potential use in sensing and other photonic technologies.
机译：等离子体纳米天线的周期性阵列的光学特性受到阵列平面内相干多重散射的强烈影响，当波长与周期相对应时，这会在透射和反射中导致尖锐的光谱共振。我们证明了基板的存在（即非对称折射率环境）可以抑制粒子之间的远程耦合并抑制晶格共振，这与最近的实验结果一致。我们发现衬底到上层的折射率对比以及阵列和界面之间的距离是决定衍射耦合强度的关键参数。一个简单的分析模型很好地再现了我们严格的电磁仿真。这些发现对于周期性结构的设计及其对光共振的评估非常重要，以用于传感和其他光子技术。

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