Photoluminescence from optical waveguiding LiNbO3 film formed on crystalline SiO2 substrate by pulsed laser deposition
نویسندگان
چکیده
Optical waveguiding LiNbO3 film was grown on ~001!-oriented crystalline SiO2 substrate by pulsed laser deposition. The film is highly ~012! textured and has smooth surface. Its photoluminescence ~PL! spectra were obtained by using the 514.4 nm line excitation of Ar laser, displaying a broad band peaked at 2.2 eV at room temperature and three well-resolved luminescent bands peaked at 2.3, 2.2, and 2.14 eV at liquid nitrogen temperature with different polarization properties. Spectral analysis indicates that these obtained PL bands arise from the self-trapped excitons and the E8 defect pairs connected with oxygen vacancies in the LiNbO3 film. © 1996 American Institute of Physics. @S0003-6951~96!00252-5#
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