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Damping of Surface Plasmon–Phonon Polaritons
Author(s) -
Barlas T. R.,
Dmitruk N. L.
Publication year - 1995
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221870110
Subject(s) - phonon , condensed matter physics , polariton , surface plasmon polariton , dissipation , surface phonon , plasmon , wave vector , surface plasmon , dispersion (optics) , planar , scattering , materials science , physics , optics , quantum mechanics , computer graphics (images) , computer science
The influence of the bulk damping in polar crystals on the elementary properties of surface polaritons (SP) of a mixed plasmon–phonon type is studied theoretically. Two different methods for the calculation of SP damping are used. These methods are shown to give the same results. Definite combinations of the plasmon and phonon damping constants are found to lead to a minimum in the damping and a maximum in the planar propagation length versus wave vector dependences. An increase in the SP energy dissipation due to an increase in the damping constants of elementary excitations in a crystal and the SP scattering by surface roughness give rise to a reduction of the SP frequency, but the shape of the dispersion curve changes differently, what can be distinguished experimentally.