A theoretical treatment of the excitonic enhancement of two-photon absorption is presented for quasi-twodimensional quantum-well structures. The two-photon absorption coefficient and the nonlinear index of refraction are calculated for TM and TE polarizations. Significant enhancement is observed in the TM case as a result of excitonic effects. This treatment differs from previous ones in that simple analytical expressions are derived. Moreover, we consider the asymptotic behavior as the size of the quantum well increases toward a three-dimensional system.
© 1995 Optical Society of America
Amjad Obeidat and Jacob Khurgin, "Excitonic enhancement of two-photon absorption in semiconductor quantum-well structures," J. Opt. Soc. Am. B 12, 1222-1227 (1995)