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Title: Femtosecond Z-scan investigation of nonlinear refraction in surface modified PbS nanoparticles
Authors: Li, H.P.
Liu, B. 
Kam, C.H.
Lam, Y.L.
Que, W.X.
Gan, L.M. 
Chew, C.H. 
Xu, G.Q. 
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.
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
ISSN: 09253467
DOI: 10.1016/S0925-3467(00)00003-3
Appears in Collections:Staff Publications

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