Phys. Rev. Lett. 68, 654–657 (1992)Optical dynamics in crystal slabs: Crossover from superradiant excitons to bulk polaritonsReceived 13 September 1991; published in the issue dated 3 February 1992 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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