金纳米颗粒分形排列中表面晶格共振现象的观察
Observation of a surface lattice resonance in a fractal arrangement of gold nanoparticles
摘要：
非周期性排列的紧密间隔的金属颗粒的集体响应具有在感测应用中提供有益的角度和频率依赖性的潜力。在本文中，我们调查的Sierpinski分形排列的金纳米粒子的光学响应，并表明它支持一个集体共振类似的表面晶格共振存在于周期性排列的等离子体共振器。使用后焦平面显微镜，我们观察到泄漏的辐射的表面晶格共振，有效地激发时，入射光的波数匹配的分形结构的强傅立叶分量。局域表面等离子体激元之间的有效耦合导致散射光谱中的集体共振和类Fano特征。我们的实验观察支持耦合偶极近似和时域有限差分方法的基础上的数值模拟。这项工作提出了第一步的应用程序的分形安排等离子体应用
英文摘要：
The collective response of closely spaced metal particles in non-periodic arrangements has the potential to provide a beneficial angular and frequency dependence in sensing applications. In this paper, we investigate the optical response of a Sierpinski fractal arrangement of gold nanoparticles and show that it supports a collective resonance similar to the surface lattice resonances that exist in periodic arrangements of plasmonic resonators. Using back focal plane microscopy, we observe the leakage of radiation out of a surface lattice resonance that is efficiently excited when the wavenumber of the incident light matches a strong Fourier component of the fractal structure. The efficient coupling between localized surface plasmons leads to a collective resonance and a Fano-like feature in the scattering spectrum. Our experimental observations are supported by numerical simulations based on the coupled-dipole approximation and finite-difference time-domain methods. This work presents a first step towards the application of fractal arrangements for plasmonic applications
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