论文标题
基于螺旋纳米液的复合等离子体涡旋生成
Compound plasmonic vortex generation based on spiral nanoslits
论文作者
论文摘要
鉴于结构化光场和等离子涡旋的广泛应用，我们提出了复合等离子体涡流的概念，并设计了几种结构化等离激子涡流发生器。这种结构化等离子涡流发生器由多种螺旋纳米液组成，它们可以生成两个或多个同心等离子体涡流。不同于拉瓜 - 高斯梁，不同区域中等离子涡流的拓扑电荷是不同的。理论分析为径向结构化等离子涡流发生器设计的基础和数值模拟的基础确认了设计原理的有效性。关于涡流场干扰的讨论确定了结构化涡流的生成条件。这项工作提供了一种设计方法，用于使用螺旋纳米液生成新的涡旋，而高级径向结构的等离子涡流有助于扩大涡流场的应用。
In view of wide applications of structured light fields and plasmonic vortices, we propose the concept of compound plasmonic vortex and design several structured plasmonic vortex generators. This kind of structured plasmonic vortex generators consists of multiple spiral nanoslits and they can generate two or more concentric plasmonic vortices. Different from Laguerre-Gaussian beam, the topological charge of the plasmonic vortex in different region is different. Theoretical analysis lays the basis for the design of radially structured plasmonic vortex generators and numerical simulations for several examples confirm the effectiveness of the design principle. The discussions about the interference of vortex fields definite the generation condition for the structured vortex. This work provides a design methodology for generating new vortices using spiral nanoslits and the advanced radially structured plasmonic vortices is helpful for broadening the applications of vortex fields.
