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Phys. Rev. Lett. 68, 654 - 657 (1992)

Optical dynamics in crystal slabs: Crossover from superradiant excitons to bulk polaritons

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Jasper Knoester
Department of Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands

Received 13 September 1991

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.


©1992 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.68.654
DOI: 10.1103/PhysRevLett.68.654
PACS: 73.20.Dx, 36.40.+d, 42.50.Fx, 71.36.+c

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