Optical properties of 0.74Pb(Mg_(1/3)Nb_(2/3))O_3-0.26PbTiO_3 thin films

0.74Pb(Mg1/3Nb2/3)O3-0.26PbTiO3(PMN-0.26PT) thin films were prepared on Si substrate with a LaNiO3(LNO) buffer layer by radio-frequency magnetron sputtering.X-ray diffraction(XRD) showed that the films are(110) preferred orientation with pure perovskite structures.The optical reflectance spectra were fitted by the method of least squares.A refractive index of 2.41 at a wavelength of 633 nm was obtained for the thin films deposited at 500 ℃.The Value of n is the largest at all deposition temperature,which is due to more uniform grain structure.Our research indicated that the refractive indices and the extinction coefficient of the thin films increase with the photon energy increasing.These characteristics could make them applied at low-voltage electro-optic switching and optical waveguiding.