Studies of Optical Nonlinearity Behaviors of Ultrafine PbS Particles in Perfluorocarboxylated Cation-exchanged Films

Ultrafine PbS particles with different sizes have been prepared in perfluorocarboxylated cation-exchanged films. The variation of PbS particle size was clarified by absorption spectra and TEM graphs. Time-resolved optical Kerr effects were measured by femtosecond pump-probe techniques. Optical Kerr effect response time was estimated to be less than 165 fs. A third-order optical nonlinearity of χ(3)10-12 esu for PbS particles was obtained and it was found that it increases with the decrease of particle sizes, showing the influence of quantum confined effect on optical nonlinear behaviour of ultrafine particles.

Ultrafine PbS particles with different sizes have been prepared in perfluorocarboxylatedcation-exchanged films.The variation of PbS particle size was clarified by absorption spectraand TEM graphs.Time-resolved optical Kerr effects were measured by femisecond pump-probe techniques.Optical Kerr effect response time was estimated to be less than 165 fs.Athird-order optical nonlinearity of～10-12esu for PbS particles was obtained and it wasfound that it increases with the decrease of particle sizes,showing the influence of quantumconfined effect on optical nonlinear behavious of Ultrafine particles.