Multiphoton-absorption (MPA) induced ultraviolet (UV) luminescence of ZnO nanorods grown by vapor phase transport was demonstrated using ultrafast excitation at pulse energies in the few nanojoules range, directly generated by a Ti:sapphire laser oscillator at wavelengths around 800 nm. The dependence of the UV luminescence on the excitation density reveals a two-photon absorption process as the responsible excitation mechanism. The broad spectral bandwidth of the excitation pulses obviously promotes the feasibility of the observed two-photon channel. Theoretical estimates concerning the contribution of nonlinear absorbance strongly support the experimental findings. The essential conditions for proper utilization of this process are discussed.
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Funders:
DFG Contract No. 1782/12- 1., Science Foundation Ireland SFI for a Strategic Research Cluster grant Functional Oxides and Related Materials for Electronics, FORME, SFI Research Frontiers Programme Grant No. 06/RFP/PHY052
ID Code:
23271
Deposited On:
08 May 2019 15:27 by
Enda Mcglynn
. Last Modified 01 Dec 2020 17:13