Plasmon Localization Assisted by Conformal Symmetry,ACS Photonics

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Plasmon Localization Assisted by Conformal Symmetry
ACS Photonics ( IF 6.5 ) Pub Date : 2020-03-02 , DOI: 10.1021/acsphotonics.9b01581
Lizhen Lu _{1,

2} , Emanuele Galiffi ₂ , Kun Ding ₂ , Tianyu Dong ₁ , Xikui Ma ₁ , J. B. Pendry ₂

Affiliation

Plasmonic systems have attracted remarkable interest due to their application to the subwavelength confinement of light and the associated enhancement of light–matter interactions. However, this requires light to dwell at a given spatial location over time scales longer than the coupling rate to any relevant loss mechanism. Here we develop a general strategy for the design of stopped-light plasmonic metasurfaces, by taking advantage of the conformal symmetry which underpins near-field optics. By means of the analytical technique of transformation optics, we propose a class of plasmonic gratings which is able to achieve ultraslow group velocities, effectively freezing surface plasmon polaritons in space up to 31 time cycles. Our method can be universally applied to the localization of polaritons in metallic systems, as well as in highly doped semiconductors and even two-dimensional conductive and polar materials, and may find potential applications in nanofocusing, nanoimaging, spectroscopy, and light harvesting.

中文翻译：

适形对称辅助的等离子定位

等离子体系统由于其在光的亚波长范围内的应用以及与之相关的光-物质相互作用的增强而引起了极大的兴趣。但是，这需要光在一定时间范围内驻留在给定的空间位置，该时间间隔要比与任何相关损耗机制的耦合率更长。在这里，我们利用支撑近场光学的共形对称性，开发了用于设计停光等离子体超表面的通用策略。借助变换光学的分析技术，我们提出了一类等离激元光栅，该光栅能够实现超慢的群速度，有效冻结空间中的表面等离激元极化子长达31个时间周期。我们的方法可以普遍应用于金属系统中极化子的定位，

更新日期：2020-04-23

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