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

✍ Scribed by Mingfu Zhang; Bin Yang; Hengzhi Chen; Wenwu Cao

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 435 KB
• Volume: 32
• Category: Article
• ISSN: 0925-3467
• DOI: 10.1016/j.optmat.2009.08.003

✦ Synopsis

Layered-perovskite ferroelectric Bi 2.25 La 0.75 TiNbO 9 (LBTN-0.75) optical waveguiding thin films have been prepared on fused silica substrates by pulsed laser deposition (PLD). X-ray h-2h 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 Wentzel-Kramer-Brillouin (iWKB) method.