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Acta Physica Sinica

FREE EXCITON EMISSION AND OPTICAL NONLINEARITY OF ZNSE-ZNS/CAF2 SUPERLATTICES UNDER HIGH-EXCITATION DENSITY

D. Z. Shen, Xiuwei Fan, G.H. Fan

Published Jan 1, 1992• 1 citation
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Abstract

The free exciton emission and optical nonlinearity in ZnSe-ZnS grown by MOCVD on CaF 2 substrates have been studied under different excitation densities at 77 K. We report the first observation of the new emission band due to Ex − Ex interaction, exciton saturating absorption and exciton optical bistability in ZnSe-ZnS/CaF 2 superlattices. The dominant exciton optical nonlinear mechanism for ZnSe-ZnS/CaF 2 superlattices under high excitation density is the combination of phase-space filling of exciton state and exciton band broadening

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