We have investigated the nonlinear optical response of thin films consisting of a poly(propyleneimine) dendrimer matrix having diaminobutane core with and without small 2.2nm diameter CdS quantum dots. Large nonlinear coefficients and low nonlinear absorption losses were observed at 532 and 1064nm. The high nonlinearity and low two-photon absorption yielded promising figures of merit for nonlinear optical switching applications.

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An ordered array of n-type semiconductor spheres was interfaced with a matrix of p-type material to realize a distributed structure with face-centre-cubic symmetry. Both types have been realized by the use of functionalized single walled carbon nanotubes. The structures lack typical dc junction characteristics because of connectivity between p-type regions. They exhibit nonlinear optical characteristics (ac effect), which was attributed to the quadratic Stark effect.

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