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We study the bulk and surface phonon-polaritons of the Zn0.67Be0.33Sezincblende alloy by near-forward Raman scattering. The short (Be-Se) bondexhibits a distinct percolation doublet in the conventional backscatteringRaman spectra, corresponding to a three-mode behavior in total[1(Zn-Se),2(Be-Se)] for Zn0.67Be0.33Se. This offers an opportunity to achieve arefined understanding of the phonon-polariton modes of a zincblende alloybeyond the current two-mode approximation, corresponding to a[1(Zn-Se),1(Be-Se)] description in the present case. The discussion issupported by contour modeling of the Raman signals of the multi-mode bulk andsurface phonon-polaritons within the formalism of the linear dielectricresponse.

Near-forward Raman scattering by bulk and surface phonon-polaritons in the model percolation-type ZnBeSe alloy