Ultrafast carrier dynamics of Cu2O thin film induced by two-photon excitation

doi:10.1088/1674-1056/ac003c

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.

Keywords: carrier dynamics cuprous oxide transient absorption two-photon absorption

Received: 11 March 2021
Revised: 19 April 2021
Accepted manuscript online: 12 May 2021

PACS:	42.65.-k	(Nonlinear optics)
	42.70.Nq	(Other nonlinear optical materials; photorefractive and semiconductor materials)
	78.47.D-	(Time resolved spectroscopy (>1 psec))

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61505178).

Corresponding Authors: Shu Chen
E-mail: chenshu@zzu.edu.cn

Cite this article:

Jian Liu(刘建), Jing Li(李敬), Kai-Jun Mu(牧凯军), Xin-Wei Shi(史新伟), Jun-Qiao Wang(王俊俏), Miao Mao(毛淼), Shu Chen(陈述), and Er-Jun Liang(梁二军) Ultrafast carrier dynamics of Cu₂O thin film induced by two-photon excitation 2021 Chin. Phys. B 30 114205

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Ultrafast carrier dynamics of Cu2O thin film induced by two-photon excitation

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Ultrafast carrier dynamics of Cu₂O thin film induced by two-photon excitation