Please use this identifier to cite or link to this item: https://doi.org/10.1021/jp047787q
Title: Ultrafast and large third-order nonlinear optical properties of CdS nanocrystals in polymeric film
Authors: He, J. 
Ji, W. 
Ma, G.H. 
Tang, S.H. 
Kong, E.S.W.
Chow, S.Y.
Zhang, X.H.
Hua, Z.L.
Shi, J.L.
Issue Date: 17-Mar-2005
Citation: He, J., Ji, W., Ma, G.H., Tang, S.H., Kong, E.S.W., Chow, S.Y., Zhang, X.H., Hua, Z.L., Shi, J.L. (2005-03-17). Ultrafast and large third-order nonlinear optical properties of CdS nanocrystals in polymeric film. Journal of Physical Chemistry B 109 (10) : 4373-4376. ScholarBank@NUS Repository. https://doi.org/10.1021/jp047787q
Abstract: We report the ultrafast and large third-order nonlinear optical properties of CdS nanocrystals (NCs) embedded in a polymeric film. The CdS NCs of 2 nm radius are synthesized by an ion-exchange method and highly concentrated in the two layers near the surfaces of the polymeric film. The two-photon absorption coefficient and the optical Kerr coefficient are measured with laser pulses of 250 fs duration at 800 nm wavelength. The one-photon and two-photon figures of merit are determined to be 3.1 and 1.3, respectively, at irradiance of 2 GW/cm2. The observed nonlinearities have a recovery time of ∼1 ps. The two-photon-generated free carrier effects have also been observed and discussed. These results demonstrate that CdS NCs embedded in polymeric film are a promising candidate for optical switching applications. © 2005 American Chemical Society.
Source Title: Journal of Physical Chemistry B
URI: http://scholarbank.nus.edu.sg/handle/10635/98496
ISSN: 15206106
DOI: 10.1021/jp047787q
Appears in Collections:Staff Publications

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