Optical properties of Bi2.25La0.75TiNbO9 thin films grown on fused silica substrates by PLD

作者：Zhang Mingfu; Yang Bin^*; Chen Hengzhi; Cao Wenwu

来源：Optical Materials, 2009, 32(2): 406-409.

DOI：10.1016/j.optmat.2009.08.003

• Optical waveguide
• Bi2.25La0.75TiNbO9
• Pulsed laser deposition
• Prism-coupling technique

Layered-perovskite ferroelectric Bi2.25La0.75TiNbO9 (LBTN-0.75) optical waveguiding thin films have been prepared on fused silica substrates by pulsed laser deposition (PLD). X-ray 0-20 scans revealed that the films are single-phase perovskite. The optical properties, such as the wavelength dependence of the transmittance and the refractive index, were determined. The average transmittance of the film is 75% in the wavelength range of 200-1100 nm and the band gap E-g = 3.46 eV. The optical waveguiding properties of the films were characterized by using prism coupling method. The distinct m-lines of the guided transverse electric (TE) and transverse magnetic (TM) modes of the LBTN-0.75 films waveguide have been observed. The film homogeneity and the film-substrate interface were analyzed using the inverse Went-zel-Kramer-Brillouin (iWKB) method.

• 出版日期2009-12
• 单位哈尔滨工业大学