标题： 基于艾里表面等离激元的定制热点 显示英文标题

标题： Tailored Hotspots from Airy-Based Surface Plasmon Polaritons

摘要： 表面等离子体激元由于其固有的能够可控地将光局限在衍射极限以下的能力以及它们在纳米尺度上直接应用于捕获和传输物质的直接应用，引起了光子学界的日益关注。 这种方法被称为等离子体镊子，利用由局域等离子体或表面等离子体极化激元（SPP）产生的局限场，这些场分别起源于基于纳米结构的陷阱附近或无结构平台之间。 在此，我们提出了一种新的理论方法，通过在平滑的介电-金属界面处重叠艾里表面等离子体极化激元（ASPP）来生成强烈的光热点并工程化其特征。 我们将属于新型完整有限能量ASPP基组的赫尔墨特-高斯模式对相干叠加，从而产生高度局限的等离子体热点（$\approx \lambda$/10），而无需使用任何纳米结构平台。 模式阶数和相对间距参数可以用来调整所述热点的强度和品质因数，大大优于仅基于高斯模式的对应物。 我们的方法为使用基于ASPP的结构化光在纳米尺度上限制光提供了一个有前景的方向，这有助于推进无结构等离子体镊子的发展，并且在光学信号处理和等离子电路中的应用具有潜在的前景。 显示英文摘要

摘要： Surface plasmons have attracted growing interest from the photonics community due to their inherent ability to controllably confine light below the diffraction limit and their direct application in trapping and transporting matter at the nanoscale. This method, known as plasmonic tweezers, employs confined fields generated by either localized plasmons or surface plasmon polaritons (SPP), which originate in the vicinity of nanostructure-based traps or across structureless platforms, respectively. Herein, we present a new theoretical method for generating intense light hotspots and engineering their features by overlapping Airy SPPs (ASPP) at a smooth dielectric-metal interface. We coherently add pairs of Hermite-Gauss modes that belong to a novel complete basis set of finite-energy ASPPs, which yield highly confined plasmonic hotspots ($\approx \lambda$/10) without the need of using any nanostructured platform. Mode order and relative spacing parameters can be used to tailor the intensity and quality factor of said hotspots, largely outperforming their Gaussian-only-based counterparts. Our method opens a promising venue to confine light at the nanoscale using ASPP-based structured light, which helps to advance the development of structureless plasmonic tweezers and holds promising potential for its application in optical signal processing and plasmonic circuitry.