Surface plasmon-phonon polaritons of hexagonal zinc oxide

Abstract

The anisotropy of surface plasmon-phonon polaritons of the first and second types in hexagonal zinc oxide is investigated at various electron concentrations and orientations of the C axis of the crystal relative to its surface. It is shown that surface plasmon-phonon polaritons of a third type are generated when the electron concentration in ZnO is greater than 2×10¹⁸ cm⁻³ and the orientation corresponds to K⊥C and xy⊥C. The spectrum of the surface plasmon-phonon polaritons of the third type are calculated, and the conditions for the existence of surface plasmon-phonon polaritons of the third type in ZnO single crystals are determined.