Ultrafast carrier dynamics of Cu2O thin film induced by two-photon excitation |
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Affiliation: | School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China |
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Abstract: | Cuprous oxide (Cu2O) 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 Cu2O 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. |
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Keywords: | carrier dynamics cuprous oxide transient absorption two-photon absorption |
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