Localized Plasmonic Vortex Printing Technology Based on the Metaparticle and Spoof Surface Plasmon Polaritons

Abstract

Plasmonic structures based on Archimedes spiral (AS) architectures have attracted great interest to generate plasmonic vortices (PVs) carrying controllable orbital angular momentum (OAM). Recently, researches based on the single deep‐subwavelength metaparticle have provided various methods to realize PVs. However, most of the PVs structures just realize single topological charge and only a few works have implemented vortex waves with multiple topological charges. Hence, it is still a big challenge to excite localized electromagnetic (EM) vortices with multimodal topological charges in single structure simultaneously. A potential design idea to create localized EM vortices with multimodal topological charges in single structure is proposed, which is called the printing technology for localized PVs. Taking advantages of the coplanar waveguide‐based spoof surface plasmon polaritons (CPW‐based SSPPs), localized multiple PVs modes that are strongly confined in the metaparticles can be excited simultaneously. The physical explanations and experiments are conducted to confirm this unique phenomenon. This localized PVs printing technology may be used for future microwave integrated elements and devices operating.