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Recent experiments have shown that spatial dispersion may have a conspicuousimpact on the response of plasmonic structures. This suggests that in somecases the Drude model should be replaced by more advanced descriptions thattake spatial dispersion into account, like the hydrodynamic model. Here we showthat nonlocality in the metallic response affects surface plasmons propagatingat the interface between a metal and a dielectric with high permittivity. As adirect consequence, any nanoparticle with a radius larger than 20 nm can beexpected to be sensitive to spatial dispersion whatever its size. The samebehavior is expected for a simple metallic grating allowing the excitation ofsurface plasmons, just as in Wood's famous experiments. Importantly, our worksuggests that for any plasmonic structure in a high permittivity dielectric,nonlocality should be taken into account.

Influence of spatial dispersion on surface plasmons, nanoparticles and grating couplers