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physica status solidi (b)

On the Dielectric Function of Three‐Level Systems under High Excitation. II. Exciton—Biexciton Transitions and Population Effects in CuCl

B. Hönerlage, J.‐Y. Bigot

Published May 1, 1984• 30 citations
Publisher

Abstract

Abstract Using the dielectric function calculated for a three‐level system in the presence of two coherent light fields, renormalization effects are discussed due to a finite level population, to two‐photon transitions, and to exciton—biexcition transitions for CuCl.
DOI
10.1002/pssb.2221230122

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A coherently driven exciton–biexciton transition in CuCl enables one to propagate a probe light beam within the exciton-polariton stop-band where radiation is otherwise completely reflected. The stop-band transparency window can be controlled via the pump beam frequency and intensity. The phenomenon is reminiscent of quantum coherence effects occurring in three-level atomic systems, except that it here involves delocalized electronic excitations in a crystal via a frequency and wave-vector selective polaritonic mechanism. Both a free standing slab and a microcavity configuration are theoretically studied. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)