Cuprous oxide(Cu_(2)O)has attracted plenty of attention for potential nonlinear photonic applications due to its superior third-order nonlinear optical property such as two-photon absorption.In this paper,we investiga...Cuprous oxide(Cu_(2)O)has attracted plenty of attention for potential nonlinear photonic applications due to its superior third-order nonlinear optical property such as two-photon absorption.In this paper,we investigated the two-photon excitation induced carrier dynamics of a Cu_(2)O thin film prepared by radio-frequency magnetron sputtering,using the femtosecond transient absorption experiments.Biexponential dynamics including an ultrafast carrier scattering(<1 ps)followed by a carrier recombination(>50 ps)were observed.The time constant of carrier scattering under two-photon excitation is larger than that under one-photon excitation,due to the different transition selection rules and smaller absorption coefficient of the two-photon excitation.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.61505178).
文摘Cuprous oxide(Cu_(2)O)has attracted plenty of attention for potential nonlinear photonic applications due to its superior third-order nonlinear optical property such as two-photon absorption.In this paper,we investigated the two-photon excitation induced carrier dynamics of a Cu_(2)O thin film prepared by radio-frequency magnetron sputtering,using the femtosecond transient absorption experiments.Biexponential dynamics including an ultrafast carrier scattering(<1 ps)followed by a carrier recombination(>50 ps)were observed.The time constant of carrier scattering under two-photon excitation is larger than that under one-photon excitation,due to the different transition selection rules and smaller absorption coefficient of the two-photon excitation.