alpha spiral nanoslit and the higher order plasmonic vortex generation

摘要

In view of the conciseness of a spiral nanoslit and the limited order of the generated vortex, a kind of nanometer spiral, named alpha spirals, is proposed to generate a higher order plasmonic vortex. Theoretical analysis provides the basis for the advancement of an alpha spiral. The proposed spiral can generate the plasmonic vortex and the extreme order of the generated vortex depends on parameter alpha. The numerical simulations express the valid region of the plasmonic vortex generated by the alpha spiral. Discussions about the validity range of the alpha spiral nanoslit and the influence of the film material are beneficial to generate a high order vortex. This work builds a platform for the generation of the higher order plasmonic vortex using the simple spiral nanostructure and it can extend the potential applications of higher order plasmonic vortices.