I think you are talking about SPPs in an anisotropic medium so they couple more field components than a standard SPP in an isotropic medium. You may also be talking about and SPP coupled to a phonon, so you will have an electronic oscillation coupled to a photon coupled to a phonon.
of course dear Rumpf hit a great point and beside that If you mean hybrid plasmonic mode for a hybrid plasmonic waveguide, then it is chiefly referred to the modes with high confinement factor, specially confined between two media, and there are several papers with hybrid plasmonic nanowire structures (i.e. between dielectric nanowire and metalic substrate or reverse). some of them have longer propagation lengths and cited like hybrid long range SPP. (simply like : https://en.wikipedia.org/wiki/Hybrid_plasmonic_waveguide)
Role of hybridized surface plasmon polaritons in Hyperbolic metamaterials
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