On the performance of plasmonic meniscus lenses for surface plasmon focusing
On the performance of plasmonic meniscus lenses for surface plasmon focusing
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DOI：
10.23919/at-ap-rasc54737.2022.9814416
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发表时间：
2022-05
期刊：
影响因子：
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通讯作者：
J. Riley;N. Healy;V. Pacheco-Peña
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文献类型：
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作者：
J. Riley;N. Healy;V. Pacheco-Peña
在这项工作中，我们提出了一个超紧凑的等离子体弯月形透镜的表面等离子体极化子（SPP）聚焦的设计过程和响应。为了设计透镜，我们通过引入在不同多层介质中行进的SPP的有效介质的概念来适应透镜制造商方程（经典光学技术）。然后利用该适应的方程来设计用于等离子体的凹凸透镜，也称为正弯月面透镜。该透镜的设计是将一个菱形的氮化硅（Si3N4）块放置在一个半无限的金（Au）板的顶部。透镜的性能进行了详细的评估，在功率增强，焦深，和空间分辨率的焦点。此外，透镜的鲁棒性进行了研究，使用离轴照明沿着其光谱响应，演示了如何适应透镜制造商方程可以用于这种等离子体弯月面装置的设计。
In this work, we present the design process and response of an ultra-compact plasmonic meniscus lens for Surface Plasmon Polariton (SPP) focusing. To design the lens, we adapted the lens maker equation (a classical optics technique) by introducing the concept of effective media for SPPs traveling within different multilayered media. This adapted equation was then exploited to design a convex-concave lens, also known as a positive meniscus lens, for use in plasmonics. The lens was designed by placing a meniscus-shaped block of silicon nitride (Si3N4) on top of a semi-infinite slab of gold (Au). The performance of the lens is evaluated in detail in terms of the power enhancement, depth of focus, and spatial resolution of the focus. Moreover, the lens robustness is studied using off-axis illumination along with its spectral response, demonstrating how the adapted lens maker equation can be used in the design of such plasmonic meniscus devices.