Corrections to enhanced optical nonlinearity of superlattices
The following article appeared in Applied Physics Letters 44, 977 (1984) and may be found at http://dx.doi.org/10.1063/1.94618.
In recent publications, a large enhancement of the third order nonlinear optical susceptibility was predicted for GaAs-GaAIAs 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.
G. Cooperman, L. Friedman, and W. L. Bloss. "Corrections to enhanced optical nonlinearity of superlattices" Computer and Information Science Faculty Publications (1984).
Available at: http://works.bepress.com/gcooperman/5