SiO2/TiO2/methylcellulose composite materials processed by the sol-gel technique were studied for optical waveguide applications. With the help of methylcellulose, an organic binder, SiO2/TiO2/methylcellulose hybrid thick films were prepared by a single spin-coating processes. After annealing at 70 Celsius degree for an hour, 2.5-?m crack-free and dense organic--inorganic hybrid optical films with a refractive index of 1.537 were achieved. Optical losses of plane waveguide made up of those films and ordinary slide glass substrate are around 0.3 dB/cm at 650 nm. Scanning electronmicroscopy (SEM) and UV-visible spectroscopy (UV-VIS), have been used to characterize the thick films.
© 2005 Chinese Optics Letters
(130.3130) Integrated optics : Integrated optics materials
(160.4670) Materials : Optical materials
(160.6060) Materials : Solgel
(230.7390) Optical devices : Waveguides, planar
(310.6860) Thin films : Thin films, optical properties
Jun Yang, Xinyu Zhang, Pei Wang, Hai Ming, Yunxia Wu, Jianping Xie, and Junying Zhang, "Preparation and characterization of SiO2/TiO2/methylcellulose hybrid thick films for optical waveguides," Chin. Opt. Lett. 3, 399-401 (2005)