P. Nandakumar et al., Quantum size effects on the third order optical nonlinearity of CdS quantum dots in Nafion, OPT COMMUN, 185(4-6), 2000, pp. 457-465
Optical nonlinearities of CdS quantum dots in the strongly confined regime
are probed through degenerate four-wave-mixing experiments in an attempt to
study the size dependence of the third order optical susceptibility chi ((
3)). The results indicate that chi ((3)) is strongly dependent on the diame
ter of the dots and that there is a large increase in chi ((3)) values as t
he diameter decreases below 2 nm. Polarization discrimination studies point
to nonthermal contributions to the mechanism of optical nonlinearity. (C)
2000 Elsevier Science B.V. All rights reserved.