SEARCH Articles Figures Tables Acoustic/optical phonon modes Highest-energy optical phonons Hydrides optical phonons Longitudinal optical phonon Longitudinal-optical phonon branches Optic phonon branches Optical Detection of Coherent Phonons Optical Phonons in a-plane GaN under Anisotropic Strain Optical phonon Optical phonon Optical phonon dispersion Optical phonon frequency Optical phonon scattering Optical phonon softening Optical phonons Optical phonons Optical phonons, surface Phonon mode frequencies optical Phonon transversal optical Phonons optical modes Phonons optical, bound states Polar optical phonons Transverse optical phonon mode Transverse-optical phonon Transverse-optical phonon branches