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|Title:||Ultrafast and large third-order nonlinear optical properties of CdS nanocrystals in polymeric film||Authors:||He, J.
|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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