摘要
Surface modified PbS nanocrystals were fabricated by a novel method and their ultrafast optical nonlinearity was studied by the femtosecond time-resolved optical Kerr effect.A large nonlinear effect(χ^((3))~5×10^(-12) esu)with a laser pulse limited response was observed.This may be attributed to the reduction of surface trapped electrons due to the surface modification.
基金
Supported by the National Natural Science Foundation of China under Grant No.19574001。
