Microscopic analysis of the energy, momentum, and spin distributions in a surface plasmon-polariton wave
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Дата
2021
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Анотація
We analyze the electromagnetic field near a plane interface between a conductive and
a dielectric media, under conditions supporting surface plasmon-polariton (SPP) propagation.
The conductive medium is described by the hydrodynamic electron-gas model that enables a
consistent analysis of the field-induced variations of the electron density and velocity at the
interface and its nearest vicinity. The distributions of electromagnetic dynamical characteristics:
energy, energy flow, spin and momentum are calculated analytically and illustrated numerically,
employing silver-vacuum interface as an example. A set of the “field” and material contributions
to the energy, spin and momentum are explicitly identified and classified with respect to their
physical origins and properties, and the orbital (canonical) and spin (Belinfante) momentum
constituents are separately examined. In this context, a procedure for the spin-orbital momentum
decomposition in the presence of free charges is proposed and substantiated. The microscopic
results agree with the known phenomenological data but additionally show specific nanoscale
structures in the near-interface behavior of the SPP energy and momentum, which can be
deliberately created, controlled and used in nanotechnology applications.
Опис
Ключові слова
electromagnetic field, surface plasmon-polariton (SPP)
Бібліографічний опис
Optical Materials Express