Abstract

Valence-subband nonparabolicity is shown theoretically to lead to nonlinearities associated with terahertz third-harmonic generation in strained $p$-type quantum wells. For strained InAs quantum wells it is found that the corresponding value of ${\chi }^{\left(3\right)}$ can be as large as $\sim {10}^{-12} {\left(\mathrm{m}/\mathrm{V}\right)}^2$. The predicted values of ${\chi }^{\left(3\right)}$ are in the range of those associated with intersubband transitions in the mid-infrared region of the spectrum.

© 2001 Optical Society of America

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