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Zinc germanium diphosphide (ZnGeP 2 ) is an attractive and promising functional material for different devices of the nano- and optoelectronics. In this paper, dispersion of phonon surface polaritons (PSPs) in ZnGeP 2  has been studied in the 200–500-cm −1  spectral range at 4 and 300 K. Dispersion of “real” and “virtual” PSPs were calculated for  C -axis being normal and parallel to the surface. Anisotropy in ZnGeP 2  leads to the different numbers of PSP dispersion branches for different orientations of the sample. The temperature-dependent phonon contributions in the dielectric permittivity shift dispersion of the surface polaritons in ZnGeP 2  to the higher wavenumbers at 4 K. We have shown that experimental dispersion of PSP is in agreement with theory.

Dispersion of Phonon Surface Polaritons in ZnGeP2: Anisotropy and Temperature Impacts