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Nanocavities inscribed in a gold thin film is optimized and arranged to form a metasurface. We demonstrate both numerically and experimentally that surface plasmon vortex carrying orbital angular momentum can be generated under linearly-polarized optical excitation.
Surface plasmon vortices with arbitrary pattern are synthesized via geometrical designs. The resulting vortex intensity patterns are experimentally measured using a near-field scanning optical microscope and are in good agreements as compared to numerical results.
We numerically demonstrate a designed plasmonic nanocluster can function as nanoscopic polarization analyzer to a quantum emitter. Up to ten polarization states of such source can be distinguished.
We demonstrate numerically that the shape (“c” and triangle) and the orientation of surface plasmon intensity distribution can be arbitrarily controlled in a plasmonic spiral through simple geometrical design.
Numerical simulations show up to five localized surface plasmons (LSP) states can be selectively excited using simple source polarization control in gold nano-spheres. The extinctions among different selective states are quantitatively analyzed.
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