Exploiting effective media to make meniscus lenses for surface plasmon polariton focusing
Exploiting effective media to make meniscus lenses for surface plasmon polariton focusing
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DOI：
10.1109/metamaterials54993.2022.9920842
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发表时间：
2022-09
期刊：
影响因子：
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通讯作者：
J. Riley;N. Healy;V. Pacheco-Peña
中科院分区：
文献类型：
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作者：
J. Riley;N. Healy;V. Pacheco-Peña
在这里，我们展示了利用经典光学技术来设计用于聚焦表面等离子体激元的等离子体弯月透镜。为了实现这一目标，我们调整了透镜制造商方程，以纳入在电介质-电介质-金属和电介质-金属配置中传播的表面等离子体激元的有效折射率。这里讨论的器件是使用位于半无限金板上的氮化硅弯月形块设计的，工作波长为 $\boldsymbol{\lambda}_{\mathbf{0}}=\mathbf{633}\mathbf{nm}$。然后根据功率增强、焦点位置和横向空间分辨率来评估镜头的性能。
Here, we present the exploitation of classical optics techniques to design plasmonic meniscus lenses for focusing surface plasmon polaritons. To accomplish this, we adapted the lens maker equation to incorporate the effective refractive index of surface plasmon polaritons traveling in dielectric-dielectric-metal and dielectric-metal configurations. The device discussed here is designed using a silicon nitride meniscus-shaped block positioned on a semi-infinite gold slab with an operational wavelength of $\boldsymbol{\lambda}_{\mathbf{0}}=\mathbf{633}\mathbf{nm}$. The performance of the lens is then evaluated in terms of power enhancement, focal position, and transverse spatial resolution.