Flat top surface plasmon polariton beams.
Flat top surface plasmon polariton beams.
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DOI：
10.1364/ol.42.004143
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发表时间：
2017-10
期刊：
影响因子：
3.6
通讯作者：
Lauren Zundel;R. Martínez-Herrero;A. Manjavacas
中科院分区：
文献类型：
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作者：
Lauren Zundel;R. Martínez-Herrero;A. Manjavacas
表面等离子体激元 (SPP) 已成为引导和操纵低于衍射极限的光的强大工具。在这种情况下，显示恒定横向轮廓的平顶 SPP 光束的可用性可以实现均匀的激励和耦合场景，从而为开发使用传统高斯 SPP 光束无法实现的新颖应用打开了大门。在这里，我们对沿平坦金属-电介质界面传播的平顶 SPP 光束进行了严格的理论描述。这是通过使用 Hermite-Gaussian SPP 模式来实现的，该模式构成了近轴近似中金属-电介质界面麦克斯韦方程组解的完整基础集。我们对这些光束传播时横向轮廓的演变进行了全面分析，并辅以宽度和峰度参数的研究。我们的结果有助于扩大表面等离子体激元控制和操纵衍射极限以下的光的能力。
Surface plasmon polaritons (SPPs) have emerged as powerful tools for guiding and manipulating light below the diffraction limit. In this context, the availability of flat top SPP beams displaying a constant transversal profile can allow for uniform excitation and coupling scenarios, thus opening the door to developing novel applications that cannot be achieved using conventional Gaussian SPP beams. Here, we present a rigorous theoretical description of flat top SPP beams propagating along flat metal-dielectric interfaces. This is accomplished through the use of Hermite-Gaussian SPP modes that constitute a complete basis set for the solutions of Maxwell's equations for a metal-dielectric interface in the paraxial approximation. We provide a comprehensive analysis of the evolution of the transversal profiles of these beams as they propagate, which is complemented with the study of the width and kurtosis parameters. Our results serve to enlarge the capabilities of surface plasmon polaritons to control and manipulate light below the diffraction limit.