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The radiative-excited-state dynamics in crystals slabs is studied as a function of the slab thickness L. A general dispersion relation is derived that interpolates between the superradiant-exciton regime at thicknesses small compared to an optical wavelength {λ} and bulk polaritons and thick crystals. It is shown that previous results predicting superradiance in thick slabs (L{}{λ}) arise from invalid pole approximations.
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Jasper Knoester (1992) studied this question.
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