Abstract
The nonlinear absorption and ultrafast dynamics process of WS2 and WS2-Ag nanocomposite were investigated by using nanosecond Z-scan measurements and femtosecond time-resolved transient absorption spectrum, respectively. Z-scan measurements showed that WS2 exhibit saturation absorption (SA) at low excitation intensities, with the increase of incident intensity, a switch from SA to reverse saturation absorption (RSA) occurs, but WS2-Ag nanocomposite exhibit SA at the same intensity. Transient absorption spectrum provided information show that the response time did not change much. The investigation shows that WS2 and WS2-Ag nanocomposite can be used for mode-locker and optical switcher.
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