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Ion-implantation induced nano distortion layer and its influence on nonlinear optical properties of ZnO single crystals

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11 Author(s)
Zheng, C. C. ; Department of Physics, HKU-CAS Joint Laboratory on New Materials, The University of Hong Kong, Pokfulam Road, Hong Kong, China ; Xu, S. J. ; Ning, J. Q. ; Chen, Y. N.
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Second harmonic generation (SHG) and X-ray diffraction rocking curves of high-quality ZnO single crystals implanted by different ions (He, Cu, and Zn) were investigated. Interestingly, it was found that both He- and Zn-implanted samples show a convinced increment in SHG efficiency while the Cu-implanted one does not. X-ray diffraction rocking curves of the samples show satellite structures, and the simulations firmly reveal the formation of quasi-interfaces inside He- and Zn-implanted crystals. These quasi-interfaces lead to SHG improvement in the two samples. Polarization dependence of SHG of the samples on the excitation light also evidences this conclusion.

Published in:

Journal of Applied Physics  (Volume:110 ,  Issue: 8 )