Strong Interference Luminescence of Mixed Modes in the Neighborhood of the Critical Value of Exciton Decay

Abstract

The results of a numerical calculation of the dispersion and luminescence spectra of mixed exciton modes of crystals of the CdS (${{A}_{{n = 1}}}$) type are analyzed depending on the decay $\Gamma$ of mechanical excitons and the angle $\theta$ of emission of radiation into vacuum in the vicinity of the critical values ${{\Gamma }_{c}}$ and ${{\theta }_{c}}$. It is shown that the mechanism of ${{A}_{L}}$ line formation depends significantly on the value of the light–exciton interaction parameter ${{\tilde {\omega }}_{{LT}}}\left( {{{\theta }_{c}}} \right){\text{/}}{{\Gamma }_{c}}$, the superposition of M1 and M2 waves with strongly asymmetric ${{I}_{{M1}}}(\omega )$, ${{I}_{{M2}}}(\omega )$, and symmetric ${{I}_{{12}}}(\omega )$ contours forms an almost symmetric resulting spectral contour $I\left( \omega \right)$ with a maximum at the critical frequency ${{\omega }_{c}}$.