Corrections to enhanced optical nonlinearity of superlattices

In recent publications, a large enhancement of the third order nonlinear optical susceptibility was predicted for GaAs–GaAlAs superlattices, as a result of the band nonparabolicities introduced by the additional periodicity of the superlattice. These predictions, based on the tight binding model, ar...

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Bibliographic Details
Published in:Applied physics letters 1984-05, Vol.44 (10), p.977-979
Main Authors: COOPERMAN, G, FRIEDMAN, L, BLOS, W. L
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Nonlinear optics
Optics
Physics
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Summary:In recent publications, a large enhancement of the third order nonlinear optical susceptibility was predicted for GaAs–GaAlAs superlattices, as a result of the band nonparabolicities introduced by the additional periodicity of the superlattice. These predictions, based on the tight binding model, are here extended to the more realistic Kronig–Penney model. Results show that corrections to tight binding are non-negligible; however, enhancements of χ(3) are still large, but reduced by approximately 30%–50% over previous estimates.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.94618