Second-harmonic generation, a selective probe for excitons

We have perfrmed second-harmonic generation (SHG) and sum-frequency generation (SFG) measurements on C60,NiO, and CuCl, in which Frenkel, charge-transfer, and Wannier excitons were probed, respectively. From these experiments we learn that the excitons can be clearly observed and no contribution from the electron-hole continuum can be found in our spectra. This is very different from spectra obtained by SPA, TPA and EELS. In these experiments, excitons are also observed, but are often overshadowed by the strong contributions from the optically allowed transitions which form the electron-hole continuum. From our measurements follows that SHG and SFG can be used to discriminate exciton absorptions from those of free electron-hole pairs. ...

Zie: Conclusions and discussion.

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	dankwoord
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