Observation of Interband Two-Photon Absorption Saturation in CdS Nanocrystals

Details Observation of Interband Two-Photon Absorption Saturation in CdS Nanocrystals Observation of Interband Two-Photon Absorption Saturation in CdS Nanocrystals

2005-10-15

arxiv.org/abs/cond-mat/0510402v1

J. Phys. Chem. B 109, 19184 (2005)

Physics

Condensed Matter

Materials Science

18 pages, 4 figures

Scientific paper

We report the observation of interband two-photon absorption (TPA) saturation in cadmium sulfide nanocrystals (CdS NCs) under intense femtosecond laser excitation with 1.6-eV photon energy. The observation has been compared to interband TPA saturation in bulk CdS under the same experimental conditions. By using both Z-scan technique and transient absorption measurement, the saturation intensity has been determined to be 190 GW/cm^2 for CdS NCs of 4-nm diameter, which shows two orders of magnitude greater than that for CdS bulk crystal. The results are in agreement with an inhomogeneously-broadened, saturated TPA model.

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