title: Efficient multiphoton-absorption-induced luminescence in single-crystalline ZnO at room temperature.
abstract: At room temperature, multiphoton absorption- (MPA-) induced photoluminescence in ZnO strongly driven by a femtosecond (fs) near-infrared laser is studied. Two-photon absorption and three-photon absorption are proved to be responsible for the intense luminescence, when the wavelength of the fs excitation laser is above and below the half-bandgap of ZnO, respectively. Strong MPA absorption in ZnO is unambiguously evidenced by the interferometric autocorrelation measurements of the luminescence signal.
authors.affiliation: Department of Physics and HKU-CAS Joint Laboratory on New Materials, University of Hong Kong, Pokfulam Road, Hong Kong, China.
authors.forename: D C
authors.initials: DC
authors.lastname: Dai
authors.forename: S J
authors.initials: SJ
authors.lastname: Xu
authors.forename: S L
authors.initials: SL
authors.lastname: Shi
authors.forename: M H
authors.initials: MH
authors.lastname: Xie
authors.forename: C M
authors.initials: CM
authors.lastname: Che