Surface plasmon polaritons on (silver) nanowires are
promising
components for future photonic technologies. Here, we study near-field
patterns on silver nanowires with a scattering-type scanning near-field
optical microscope that enables the direct mapping of surface waves.
We analyze the spatial pattern of the plasmon signatures for different
excitation geometries and polarization and observe a plasmon wave
pattern that is canted relative to the nanowire axis, which we show
is due to a superposition of two different plasmon modes, as supported
by electromagnetic simulations including the influence of the substrate.
These findings yield new insights into the excitation and propagation
of plasmon polaritons for applications in nanoplasmonic devices.
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