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|Title:||Femtosecond Z-scan investigation of nonlinear refraction in surface modified PbS nanoparticles||Authors:||Li, H.P.
|Issue Date:||4-Aug-2000||Citation:||Li, H.P., Liu, B., Kam, C.H., Lam, Y.L., Que, W.X., Gan, L.M., Chew, C.H., Xu, G.Q. (2000-08-04). Femtosecond Z-scan investigation of nonlinear refraction in surface modified PbS nanoparticles. Optical Materials 14 (4) : 321-327. ScholarBank@NUS Repository. https://doi.org/10.1016/S0925-3467(00)00003-3||Abstract:||The third-order optical nonlinearities of surface modified PbS nanoparticles have been measured using the Z-scan technique with femtosecond laser pulses at 780 nm wavelength. The samples studied are the nanoparticles in micro-emulsion with the PbS concentration ranging from 0.3 × 10-3 to 1.9 × 10-3 M (mol/l). A Z-scan analysis method based on the Huygens-Fresnel (H-F) propagation integral is employed to extract the nonlinear refractive index from the experimental Z-scan data with a large nonlinear phase shift. The nonlinear refractive index of the PbS nanoparticles in microemulsion is found to increase linearly with the PbS concentration. The highest concentration microemulsion gives a nonlinear refractive index of -4.7 × 10-12 cm2/W, which is approximately 3 orders of magnitude higher than those of commercially available bulk semiconductors, such as ZnS and CdS. In addition, nonlinear absorption in these samples remained unmeasurable up to 0.9 GW/cm2. The mechanisms responsible for the observed large refractive nonlinearity are discussed.||Source Title:||Optical Materials||URI:||http://scholarbank.nus.edu.sg/handle/10635/112704||ISSN:||09253467||DOI:||10.1016/S0925-3467(00)00003-3|
|Appears in Collections:||Staff Publications|
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