Optical Properties of Ca_0.25Ba_0.75Nb₂O₆ Thin Films Prepared by Spinning Coating

Yuehua Wang, Min Zhang, Xinyin Zhao and Na Zhao Department of Physics, China University of Mining and Technology, Xuzhou 221116, China

摘 要：Ca0.25Ba0.75Nb2O6 （CBN25） thin film was prepared on quartz substrate by spinning coating and the optical properties were investigated by a Hitachi U-3410 spectrophotometer and a Metricon 2010 prism coupler. The optical band gap, thickness and refractive index at 632.8 nm of the CBN25 thin film were determined to be 3.65 eV, 529 nm and 2.2258, respectively. The dispersion of the refractive index fitted to Sellmeier relation well and optical waves could be guided into the thin film, which implied that CBN25 thin films were promising for integrated optics and optically active devices.

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