The Generalized Drude–Lorentz Model and Its Applications in Metal Plasmonics
Keywords:bulk plasmons, surface plasmons, spatial dispersion, magnetostatic field
The Drude–Lorentz model has been generalized to the case of plasmons under nonmagnetic conductors located in the static magnetic, H0, and electric, E0, fields by taking the spatial dispersion effects into account. It is shown that the magnetostatic field H0 and the spatial dispersion induce the appearance of two additional types of low-frequency bulk plasmons, and the dispersion of bulk plasmons of all types substantially depends on the relative orientation of the direction ek of their propagation and the magnetostatic field vector H0. In the case of surface plasmons, the spatial dispersion leads to a two-component structure (in the metal) of their electric field E, and the external electrostatic field E0 induces the spatial dispersion depending on the Hall constant Rp. At the same time, the orientation of the magnetostatic field H0 has a significant effect on the total dispersion of surface plasmons.
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