Femtosecond Induced Absorption of PbS Nanoparticles Modified by AOT

Aim To prepare PbS nanoparticles modified by manoxol OT (AOT) and determine its transient nonlinear optical properties. Methods The PbS nanoparticles were prepared by using microemulsion method and the transient nonlinear optical properties were investigated with standard time resolved pump probe techniques. Results A very rapid induced absorption was investigated. The decay time of the PbS nanoparticles modified is about 100 fs. Conclusion The transient induced absorption in PbS nanoparticles modified by AOT arises from the biexciton effect and the trapped carrier induced Stark effect. The surface chemical modification environment has significant effects on the transient nonlinear optical properties.