Abstract
The surface exciton polaritons associated with the A, B and C excitons in ZnO are investigated by the attenuated total reflection (ATR) measurements. The concept of the surface admittance is introduced to understand the characteristic nature of the surface polaritons in anisotropic ZnO crystal. The experimental ATR spectra and the dispersion curves for the respective excitons are analyzed taking account of the anisotropic and non-local exciton dielectric functions and of the surface layer effect. The real and virtual surface polariton modes are identified on the B exciton from the experimental dispersion curves for particular geometries. Besides, a pseudo-surface mode is observed as additional ATR dips and is interpreted as the guided-wave mode propagating along an optical wave-guide-like structure, ZnO-surface layer-MgF 2 gap, under specific conditions.
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