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A Concentric Plasmonic Platform for the Efficient Excitation of Surface Plasmon Polaritons

机译:表面等离子极化子的有效激发同心等离子平台

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We propose a plasmonic device consisting of a concentric ring grating acting as an efficient tool for directional launching and detection of surface plasmon polaritons (SPPs). Numerical simulations and optical characterizations are used to study the fabricated structured gold surface. We demonstrate that this circularly symmetrical plasmonic device provides an efficient interface between free space radiation and SPPs. This structure offers an excellent platform for the study of hybrid plasmonics in general and of plasmon-emitter couplings in particular, such as those occurring when exciting dye molecules placed inside the ring. As illustrated in this work, an interesting property of the device is that the position of excitation determines the direction of propagation of the SPPs, providing a flexible mean of studying their interactions with molecules or dipole-like emitters placed on the surface.
机译:我们提出了一种由同心环形光栅组成的等离子设备,可作为定向发射和检测表面等离激元极化子(SPPs)的有效工具。数值模拟和光学表征用于研究制造的结构化金表面。我们证明,这种圆形对称的等离激元设备提供了自由空间辐射和SPPs之间的有效接口。这种结构为研究一般混合等离子体激元,特别是等离子体激元-发射极耦合(例如在环内激发染料分子时发生的耦合)提供了一个极好的平台。如这项工作所示,该设备的一个有趣特性是,激发位置决定了SPP的传播方向,为研究它们与表面上的分子或偶极子状发射体的相互作用提供了灵活的手段。

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