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Unusual polarizing effect of cylindrical plasmonic holes

2018; Optica Publishing Group; Volume: 43; Issue: 18 Linguagem: Inglês

10.1364/ol.43.004374

1539-4794

Matan Revah, Sergey Nechayev, Yuri Gorodetski,

Metamaterials and Metasurfaces Applications

We observe an unusual polarization state conversion in the light that passes through a cylindrical hole in a thick metal film. This phenomenon is related to the helicity locking of the guided mode due to the plasmonic transverse spin—an intrinsic angular momentum of the surface waves. We show how this effect is linked to the generation of the plasmonic vortex inside the hole and can be altered by varying the hole diameter. In addition, the total light transmission through the hole is shown to be partially contributed from the direct transmission, which can further modify the resulting light polarization state.