Abstract

Hanamura^[1] has introduced the concept of the giant two-photon absorption of the excitonic molecule. In this model the first step is the creation of an exciton by one-photon absorption and the second step is the optical conversion of this exciton to the biexciton state. The second transition has been attributed to the “giant” oscillator strength of the exciton-biexciton optical transition. The strong enhancement of the two-photon absorption arises both from the nearly resonant first step and the large probability of the second one due to the spatial extension of a biexciton.

© 1992 IQEC