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Rigorous Analysis of Electromagnetic Scattering by Grating of Plasmonic Nanorods Coupled to Magneto-Optical Slab

机译:通过等离子纳米棒与磁光平板耦合光栅对电磁散射的严格分析

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摘要

A rigorous self-contained formulation for analyzing electromagnetic scattering by a grating of plasmonic nanorods (Ag) coupled to a magneto-optical slab is presented. Bi-substituted gadolinium iron garnet is considered as the magneto-optical material. We measured the dielectric permittivity of the iron garnet and utilized the experimental data in our analyses. The method uses the Lattice Sums technique combined with the generalized reflection matrix approach. Using the method, the spectral response in reflectance as well as near-field distributions at resonance wavelengths have been numerical studied. Special attention has been paid to the coupling mechanism between the plasmonic grating and the magneto-optical slab. Physical insight is given to the strong field enhancement inside the magneto-optical material due to coupling with the plasmonic grating. Generalization of the method to the multilayered sandwiched structures, where the metal layer supporting surface plasmons is in contact with a layer possessing magnetically induced anisotropy, is straightforward. Such a combination enables one to achieve a multifold increase in sensitivity when compared with a system having just one nonmagnetic metal layer.
机译:提出了一种严格的自包含公式,用于分析耦合到磁光平板的等离激元纳米棒(Ag)的光栅的电磁散射。双取代g铁石榴石被认为是磁光材料。我们测量了石榴石铁的介电常数,并在分析中利用了实验数据。该方法使用了Lattice Sums技术与广义反射矩阵方法相结合。使用该方法,对反射率的光谱响应以及共振波长处的近场分布进行了数值研究。特别关注了等离激元光栅与磁光平板之间的耦合机制。由于与等离激元光栅的耦合,物理洞察力被提供给了磁光材料内部的强磁场增强。简单地将方法推广到多层夹层结构,其中金属层支撑表面等离子体激元与具有磁感应各向异性的层接触。与仅具有一个非磁性金属层的系统相比,这种组合可使灵敏度提高几倍。

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