Forced polarization of α-sapphire induced by coated LiNbO3 and LiTaO3 films

Yang, X.; Wu, X. L.; Feng, Y.; Li, J.; Jiang, M.
April 2004
Applied Physics Letters;4/5/2004, Vol. 84 Issue 14, p2623
Academic Journal
We have investigated the formation mechanism of the interfacial electric field in LiNbO3(or LiTaO3)/α-sapphire crystal structures, which is important in understanding the photoluminescence properties of this kind of ferroelectric film-coated crystal material. It is revealed that the interfacial electric field arises from the interfacial polarization charge generated during poling of LiNbO3(or LiTaO3) film near Curie temperature, which induces forced polarization of the α-sapphire crystal. As a result, lattice distortions of the α-sapphire crystal change the crystal field of Cr3+ ion in the sapphire crystal and therefore lead to intensity enhancement of R-line luminescence from Cr3+ centers. © 2004 American Institute of Physics.


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