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Surface-phonon polaritons on a grating of GaP thin slabs were observed by a Raman-scattering measurement. A small Raman peak due to the surface-phonon polariton was observed in the exactly forward-scattering configuration, while it could not be observed on the flat surface. The proposed microscopic theory of the Raman process on the grating, which takes account of the mixing among the excitons on the grating, explains the experimental results very well.
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Watanabe et al. (1989) studied this question.
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