研究目的
To design a simple spiral nanoslit to generate the plasmonic vortex with the order as high as possible.
研究成果
The α spiral nanoslit is a concise and effective structure for generating higher order plasmonic vortices. The order of the generated vortex is controlled by the geometric charge of the α spiral and the incident circular polarization. The study provides a foundation for further applications of spiral structures in plasmonic vortex generation.
研究不足
The quality of the generated plasmonic vortex is influenced by the attenuation of SPP fields and the value of α. The valid region for generating intact vortices is limited and depends on the geometric charge of the spiral and the material of the film.
