Abstract
We present that two distinct optical properties of light, the spin angular momentum (SAM) and the orbital angular momentum (OAM), can be coupled in the plasmonic vortex. If a plasmonic vortex lens (PVL) is illuminated by the helical vector beam (HVB) with the SAM and OAM, then those distinct angular momenta contribute to the generation of the plasmonic vortex together. The analytical model reveals that the total topological charge of the generated plasmonic vortex is given by a linear summation of those of the SAM and OAM, as well as the geometric charge of the PVL. The generation of the plasmonic vortex and the manipulation of the fractional topological charge are also presented.
Highlights
Surface plasmons (SPs) are surface electromagnetic waves coupled with collective oscillation of electrons at metal-dielectric interfaces [1,2,3]
There are a few researches about the coupling of the plasmonic vortex lens (PVL) and each of the angular momentum [24], discussion on the overall effect of the Spin angular momentum (SAM), the orbital angular momentum (OAM) and the geometrical charge of the PVL to the plasmonic vortex has not yet been established
We propose a method to generate the plasmonic vortex with arbitrary topological charge, synthesized with momenta of helical vector beam (HVB) and geometrical effect of PVL
Summary
Surface plasmons (SPs) are surface electromagnetic waves coupled with collective oscillation of electrons at metal-dielectric interfaces [1,2,3]. Considerable research has been devoted to fundamentals and applications for SP interference pattern based on the angular momenta of light [18,19,20,21,22,23]. Effect of laser beam with SAM and its application for plasmonic vortex lens (PVL) structure were presented [17]. There are a few researches about the coupling of the PVL and each of the angular momentum [24], discussion on the overall effect of the SAM, the OAM and the geometrical charge of the PVL to the plasmonic vortex has not yet been established. We propose a method to generate the plasmonic vortex with arbitrary topological charge, synthesized with momenta of HVB and geometrical effect of PVL. It is shown that effects of the SAM and the OAM of light can be coupled in the plasmonic vortex
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