A two-fluid hydrodynamic model is employed to model the spatial dispersion when both electrons and holes in semiconductors are considered. Within the two-fluid hydrodynamic model, analytical solutions to the nonlocal responses of cylindrical multilayered concentric and eccentric nanowires are obtained using the Mie theory and the scattering matrix method, which are also validated by finite element simulations. It is demonstrated that the greater the geometric asymmetry is, the stronger the acoustic resonance peaks in the extinction cross section spectra will be. In addition, charge distributions of nanowires are investigated, which reveal versatile resonance modes. We believe the proposed analytical approach provides a fast and accurate tool to rapidly analyze and optimize the optical responses of cylindrical multilayered plasmonic devices.

中文翻译：

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双流体模型中同心和偏心圆柱半导体纳米线的声共振

当考虑半导体中的电子和空穴时，采用双流体流体动力学模型对空间色散进行建模。在双流体动力学模型中，使用米氏理论和散射矩阵方法获得了圆柱状多层同心和偏心纳米线非局部响应的解析解，这些解析解也通过有限元模拟得到了验证。已经证明，几何不对称性越大，消光截面谱中的声共振峰将越强。此外，研究了纳米线的电荷分布，揭示了通用的共振模式。我们相信，所提出的分析方法为快速分析和优化圆柱形多层等离激元器件的光学响应提供了一种快速而准确的工具。