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Title: Third-order nonlinear optical response in PbS-coated CdS nanocomposites
Authors: Liu, B.
Chew, C.H. 
Gan, L.M. 
Xu, G.Q. 
Li, H. 
Lam, Y.L.
Kam, C.H.
Que, W.X. 
Issue Date: Jun-2001
Citation: Liu, B.,Chew, C.H.,Gan, L.M.,Xu, G.Q.,Li, H.,Lam, Y.L.,Kam, C.H.,Que, W.X. (2001-06). Third-order nonlinear optical response in PbS-coated CdS nanocomposites. Journal of Materials Research 16 (6) : 1644-1650. ScholarBank@NUS Repository.
Abstract: PbS-coated CdS nanocomposite particles were synthesized by an ion displacement method in an inverse microemulsion. Their growth kinetics were studied with UV-vis spectroscopy. Transmission electron microscopic characterization shows that PbS-coated CdS particles are uniform in size with a mean diameter of 6 nm. The electron diffraction patterns demonstrate their crystalline nature. Third-order nonlinear optical properties in the samples were investigated using the Z-scan technique with femtosecond laser pulses at 780-nm wavelength. The nonlinear refractive index of PbS-coated CdS nanocomposite particles in microemulsion varied with the molar ratio of Cd/Pb ions and reached a maximum of 5.3 × 10-12 cm2/GW for the sample with a Cd/Pb ion ratio of 1 to 2. The observed large refractive nonlinearity in these nanocomposite particles may be attributed to the optical Stark effect and strong interfacial and inter-nanoparticle interactions.
Source Title: Journal of Materials Research
ISSN: 08842914
Appears in Collections:Staff Publications

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