Abstract

We report a highly efficient generation of singular surface plasmon (SP) fields by an achiral plasmonic structure consisting of $\mathrm{\Lambda }$-shaped apertures. Our quantitative analysis, based on leakage radiation microscopy (LRM), demonstrates that the induced spin-orbit coupling can be tuned by adjusting the apex angle of the $\mathrm{\Lambda }$-shaped aperture. Specifically, the array of $\mathrm{\Lambda }$-shaped apertures with the apex angle 60° is shown to give rise to the directional coupling efficiency. The ring of $\mathrm{\Lambda }$-shaped apertures with the apex angle 60° was found to generate the maximum extinction ratio ($\mathrm{ER}=11$) for the SP singularities between two different polarization states. This result provides a more efficient way for developing an SP focusing and an SP vortex in the field of nanophotonics such as optical tweezers.

© 2016 Optical Society of America

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