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 χ(3) can be as large as ~10-12(m/V)2. The predicted values of χ(3) are in the range of those associated with intersubband transitions in the mid-infrared region of the spectrum.
© 2001 Optical Society of America
D. S. Citrin, "Terahertz nonlinear optics with strained p-type quantum wells," Opt. Lett. 26, 554-556 (2001)