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Following to the recently published approach [Phys. Rev. Lett. 119, 073901(2017); New J. Phys., 123014 (2017)], we refine and accomplish the generalscheme for the unified description of the momentum and angular momentum incomplex media. The equations for the canonical (orbital) and spin linearmomenta, orbital and spin angular momenta in a lossless inhomogeneousdispersive medium are presented in the compact form analogous to theBrillouin's relation for the energy. The results are applied to the surfaceplasmon-polariton (SPP) field, and the microscopic calculations support thephenomenological expectations. The refined general scheme correctly describesthe unusual SPP properties (transverse spin, magnetization momentum) andadditionally predicts the singular momentum contribution sharply localized atthe metal-dielectric interface, which is confirmed by the microscopic analysis.The results can be useful in optical systems employing the structured light,especially for microoptics, plasmophotonics, optical sorting andmicromanipulation.

Spin and momentum of the light fields in inhomogeneous dispersive media with application to surface plasmon-polariton waves