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arXiv 1111.6080physics.optics
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方位极化激励下裂环谐振腔的超高场增强

Ultra-high field enhancing in Split Ring Resonators by azimuthally polarized excitation

Jacob Scheuer

摘要:

研究了方位偏振光照射下开口环谐振腔(SRR)的场增强和谐振频率。我们发现,与线偏振照明相比,方位偏振照明的强度增强增加了一个数量级以上。我们将强度增强的增加归因于SRR几何形状与每个点中的电场向量的方向之间的改进的重叠。此外,我们提出并探索了一种方法来调整谐振频率的SRR(方位极化)通过引入更多的间隙的结构。该方法允许简单且直接地调谐谐振频率,对强度增强具有小的影响。还详细研究了设计参数对方位偏振照明下强度增强的影响,与线偏振照明的情况有明显的不同。

英文摘要:

We study the field enhancement and resonance frequencies in split-ring resonators (SRR) illuminated by azimuthally polarized light. We find that compared to linearly polarized illumination, the azimuthally polarized illumination increase the intensity enhancement by more than an order of magnitude. We attribute the increase in the intensity enhancement to the improved overlap between the SRR geometry and the direction of the electric field vector in each point. In addition, we present and explore a method to tune the resonance frequency of the SRR (for azimuthal polarization) by introducing more gaps to the structure. This approach allows for simple and straightforward tuning of the resonance frequency with small impact on the intensity enhancement. The impact of the design parameters on the intensity enhancement under azimuthally polarized illumination is also studied in details, exhibiting clear differences to the case of linear polarized illumination.

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