Hyperpolarizability of Plasmonic Meta-Atoms in Metasurfaces,Nano Letters

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Hyperpolarizability of Plasmonic Meta-Atoms in Metasurfaces
Nano Letters ( IF 9.6 ) Pub Date : 2020-12-24 , DOI: 10.1021/acs.nanolett.0c02991
M. Saad Bin-Alam ₁ , Joshua Baxter ₂ , Kashif M. Awan _{1,

3} , Antti Kiviniemi ₄ , Yaryna Mamchur _{1,

5} , Antonio Calà Lesina ₆ , Kosmas L. Tsakmakidis ₇ , Mikko J. Huttunen ₄ , Lora Ramunno ₂ , Ksenia Dolgaleva _{1,

2}

Affiliation

Plasmonic metasurfaces are promising as enablers of nanoscale nonlinear optics and flat nonlinear optical components. Nonlinear optical responses of such metasurfaces are determined by the nonlinear optical properties of individual plasmonic meta-atoms. Unfortunately, no simple methods exist to determine the nonlinear optical properties (hyperpolarizabilities) of the meta-atoms hindering the design of nonlinear metasurfaces. Here, we develop the equivalent RLC circuit (resistor, inductor, capacitor) model of such meta-atoms to estimate their second-order nonlinear optical properties, that is, the first-order hyperpolarizability in the optical spectral range. In parallel, we extract from second-harmonic generation experiments the first-order hyperpolarizabilities of individual meta-atoms consisting of asymmetrically shaped (elongated) plasmonic nanoprisms, verified with detailed calculations using both nonlinear hydrodynamic-FDTD and nonlinear scattering theory. All three approaches, analytical, experimental, and computational, yield results that agree very well. Our empirical RLC model can thus be used as a simple tool to enable an efficient design of nonlinear plasmonic metasurfaces.

中文翻译：

等离子体在表面的等离子体原子的超极化性

等离子超表面有望成为纳米级非线性光学和平坦非线性光学组件的推动者。这种超表面的非线性光学响应由单个等离激元亚原子的非线性光学特性决定。不幸的是，没有简单的方法来确定阻碍非线性超表面设计的亚原子的非线性光学性质（超极化性）。在这里，我们开发了等效的RLC此类原子的电路（电阻，电感器，电容器）模型，以估计其二阶非线性光学特性，即光谱范围内的一阶超极化性。同时，我们从二次谐波产生实验中提取了由不对称形状（细长）的等离激元纳米棱镜组成的单个亚原子的一阶超极化性，并使用非线性流体动力学-FDTD和非线性散射理论进行了详细的计算验证。分析，实验和计算这三种方法的结果都非常吻合。因此，我们的经验RLC模型可以用作简单的工具，以实现非线性等离子超颖表面的有效设计。

更新日期：2021-01-13

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