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arXiv 1701.04070physics.optics
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精确有效介质理论分析织构金属表面欺骗局域表面等离子体

Accurate Effective Medium Theory for the Analysis of Spoof Localized Surface Plasmons in Textured Metallic Cylinders

Babak Rahmani, Amirmasood Bagheri, Amin Khavasi

摘要:

最近的研究表明,由完美电导体(PEC)制成的纹理化封闭表面可以模拟高度局域化的表面等离子体(LSP)。在这里,我们提出了一个有效的介质,可以准确地模拟LSP共振在一个二维的周期性装饰PEC圆柱。以前的模型的准确性是有限的深亚波长和大量的凹槽结构。然而,我们表明,我们的模型可以成功地预测超尖锐的LSP共振存在于结构中的凹槽数量相对较少。这样的共振是不正确的预测与以前的模型,给出了一些虚假的共振。所提出的模型的成功是由于纳入了有效的表面电导率,这是创建在界面处的圆柱体和均匀介质周围的结构。该表面电导率模拟了在周期性结构中激发的较高衍射级的效应。通过全波仿真验证了该模型的有效性。

英文摘要:

It has been recently demonstrated that textured closed surfaces which are made out of perfect electric conductors (PECs) can mimic highly localized surface plasmons (LSPs). Here, we propose an effective medium which can accurately model LSP resonances in a two-dimensional periodically decorated PEC cylinder. The accuracy of previous models is limited to structures with deep-subwavelength and high number of grooves. However, we show that our model can successfully predict the ultra-sharp LSP resonances which exist in structures with relatively lower number of grooves. Such resonances are not correctly predictable with previous models that give some spurious resonances. The success of the proposed model is indebted to the incorporation of an effective surface conductivity which is created at the interface of the cylinder and the homogeneous medium surrounding the structure. This surface conductivity models the effect of higher diffracted orders which are excited in the periodic structure. The validity of the proposed model is verified by full-wave simulations.

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