Abstract

The effect of spatial dispersion in a Fabry-Perot etalon containing an excitonic system, for a normally incident light field, is to generate two coupled exciton polariton modes. The interference of these modes provides extra reflectivity features. We have calculated¹ polariton density-dependent reflectivities and by employing the upper- and lower-branch polariton energy velocities,² found the absolute internal cavity intensity. We now report on the spectral reflectivity response using an iterative method where the internal polariton density is adjusted to maintain a constant incident intensity. The resultant figures can be directly compared to experimental results. We will discuss the role of the mechanical contribution to the Poynting vector and the oscillator energy density as well as the effects of boundary conditions and energy conservation on the model.² Comparison with reflectivities from a nonspatiaily dispersive model shows a convergence toward similar spectral reflectivities for high incident intensities.

© 1985 Optical Society of America