Abstract
The nonlinear absorption (NLA) and ultrafast dynamics process of Cu1.81S nanodisks (NDs) and Ag-Cu1.81S nanocomposites are investigated by using femtosecond Z-scan measurements and femtosecond time-resolved transient absorption spectrum, respectively. After decoration with Ag particles, Ag-Cu1.81S nanocomposites exhibit stronger saturable absorption and smaller saturable intensity at 600 and 800 nm. The carrier relaxation time is measured using femtosecond time-resolved techniques, and the results showed that the prolongation of the carrier relaxation time of the composite material can lead to a stronger saturation absorption effect.
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