  Optical vibration modes of InP nanowires in the wurtzite phase were
investigated by Raman scattering spectroscopy. The wires were grown along the
[0001] axis by the vapor-liquid-solid method. The A1(TO), E2h and E1(TO) phonon
modes of the wurtzite symmetry were identified by using light linearly
polarized along different directions in backscattering configuration.
Additionally, forbidden longitudinal optical modes have also been observed.
Furthermore, by applying an extended 11-parameter rigid-ion model the complete
dispersion relations of InP in the wurtzite phase have been calculated, showing
a good agreement with the Raman experimental data.
