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|Title:||PbS-polymer nanocomposite with third-order nonlinear optical response in femtosecond regime|
|Citation:||Liu, B., Li, H., Chew, C.H., Que, W., Lam, Y.L., Kam, C.H., Gan, L.M., Xu, G.Q. (2001-12). PbS-polymer nanocomposite with third-order nonlinear optical response in femtosecond regime. Materials Letters 51 (6) : 461-469. ScholarBank@NUS Repository. https://doi.org/10.1016/S0167-577X(01)00336-6|
|Abstract:||A new method is developed using polymerized bicontinuous microemulsions to synthesize PbS-polymer nanocomposite having large nonlinear optical response. Besides a polymeric nonionic surfactant, ω-methoxy poly(ethylene oxide) 40 undecyl-α-methacrylate (C 1-PEO-C 11-MA-40), a system consisting of methyl methacrylate (MMA), acronitrile (AN), ethylene glycol dimethacrylate (EGDMA), aqueous solutions of Pb(NO 3) 2/thioacetamide (TAA) was selected. High-resolution transmission electron microscopy (HRTEM) results indicated PbS nanocrystals with a width of 5 nm and a cubic structure is formed in water domains. A single-beam Z-scan measurement showed that the nanocomposite polymer has a nonresonant and negative nonlinear refractive index (γ) of 6.8 × 10 -12 cm 2/W at 780 nm. The origin of the large nonlinear optical response based on the contribution of surface recombination owing to high surface-to-volume ratios of PbS nanoparticles to the optical nonlinearity is discussed. © 2001 Elsevier Science B.V. All rights reserved.|
|Source Title:||Materials Letters|
|Appears in Collections:||Staff Publications|
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