具有干涉包络的行波表面等离子体激元与时间晶体的研究
Travelling Surface Plasmons with Interference Envelope and A Vision for Time Crystals
摘要：
薄膜厚度和衬底折射率对覆盖层表面模式的影响是一个重要的研究步骤，可以帮助澄清围绕其传播机制的一些误解。穿透薄金属膜的单个亚波长狭缝是能够在由入射场激发时在其周围表面上发射表面等离子体激元的最简单的纳米结构之一。在这里，衬底和膜厚度对表面波的影响进行了研究。当膜的厚度与其趋肤深度相当时，来自基板的SPP波穿透膜并从覆盖层出现，产生两个SPP波的叠加，这导致具有明确定义的轨迹的拍频干涉包络，该轨迹是基板/覆盖层的驱动频率和介电常数的函数。当膜厚度减小到SPP的穿透深度时，来自光学致密的电介质/金属界面的表面波将占主导地位，导致在膜内以光学频率传播的体积等离子体激元。周期性体电荷密度与膜上的入射场的干涉产生在空间和时间上具有周期性的电荷束。
英文摘要：
The influence of the film thickness and the substrate's refractive index on the surface mode at the superstrate is an important study step that may help clearing some of the misunderstandings surrounding their propagation mechanism. A single sub-wavelength slit perforating a thin metallic film is among the simplest nanostructure capable of launching Surface Plasmon Polaritons on its surrounding surface when excited by an incident field. Here, the impact of the substrate and the film thickness on surface waves is investigated. When the thickness of the film is comparable to its skin depth, SPP waves from the substrate penetrate the film and emerge from the superstrate, creating a superposition of two SPP waves, that leads to a beat interference envelope with well-defined loci which are the function of both the drive frequency and the dielectric constant of the substrate/superstrate. As the film thickness is reduced to the SPP's penetration depth, surface waves from optically denser dielectric/metal interface would dominate, leading to volume plasmons that propagate inside the film at optical frequencies. Interference of periodic volume charge density with the incident field over the film creates charge bundles that are periodic in space and time.
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