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Formation of vortices by interference of surface plasmon polaritons

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Abstract

The TM-mode of surface plasmon polaritons (SPPs) can be excited at the interface of a metal layer and a dielectric medium. The E-mode of the SPPs is excited due to reflection of the TM-mode from the boundary of inhomogeneity in the metal layer. The interference of these modes leads to the formation of the SPP vortices in the points of minima of the mode field in some components of the Poynting vector of the SPP. The SPP interference vortex pattern changes depending on the curvature of the boundary of inhomogeneity in the metal layer, and the vortices appear and disappear in the components of the Poynting vector.

© 2016 Optical Society of America

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