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首页> 外文期刊>Physical review >Second harmonic generation in metamaterials based on homogeneous centrosymmetric nanowires
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Second harmonic generation in metamaterials based on homogeneous centrosymmetric nanowires

机译：基于均质中心对称纳米线的超材料中的二次谐波产生

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We present a comprehensive theoretical study of the second harmonic generation (SHG) in metamaterials consisting of arbitrary distributions of cylindrical nanowires made of centrosymmetric materials. The electromagnetic field at both the fundamental frequency (FF) and second harmonic (SH), as well as the total cross section, the absorption cross section, and the scattering cross section, are calculated by means of a numerical algorithm based on the multiple scattering method. Our algorithm fully describes the nonlinear optical response of the metamaterial by incorporating the contributions of both the surface and bulk nonlinear polarizations and can be applied to both s- and p-polarized incident waves. We use this numerical method to investigate the SHG in a series of particular cases of practical interest, namely, a single metallic cylinder, chains of metallic cylinders, and periodic and random distributions of such cylinders. In particular, we study the relation between the local field enhancement, via the excitation of surface plasmon-polariton modes, and the amount of energy absorbed or scattered in the far-field, at the FF and the SH.
机译：我们对超材料中的二次谐波产生（SHG）进行了全面的理论研究，超材料由中心对称材料制成的圆柱纳米线的任意分布组成。通过基于多重散射的数值算法，可以计算基频（FF）和二次谐波（SH）处的电磁场以及总横截面，吸收横截面和散射横截面方法。我们的算法通过结合表面和体非线性极化的贡献，充分描述了超材料的非线性光学响应，并且可以应用于s极化和p极化入射波。我们使用这种数值方法来研究一系列实际感兴趣的特殊情况下的SHG，即单个金属圆柱，金属圆柱的链以及此类圆柱的周期性和随机分布。尤其是，我们研究了通过表面等离激元-极化子模式的激发引起的局部场增强与在FF和SH处在远场吸收或散射的能量之间的关系。

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