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American Chemical Society, Journal of Physical Chemistry B (Soft Condensed Matter and Biophysical Chemistry), 41(109), p. 19184-19187, 2005

DOI: 10.1021/jp0534028

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Observation of Interband Two-Photon Absorption Saturation in CdS Nanocrystals

Journal article published in 2005 by Jun He ORCID, Jun Mi, Heping Li, Wei Ji
This paper is available in a repository.
This paper is available in a repository.

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Abstract

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. ; Comment: 18 pages, 4 figures