Sol-gel-processed TiO2/SiO2 films for electro-optic effect

Alin Hou; Dongcheng Shi; Maobin Yi; Shaolin Liu; Jie Sun; Weinan Gao

doi:10.1117/12.759238

4 January 2008 Sol-gel-processed TiO₂/SiO₂ films for electro-optic effect

Alin Hou, Dongcheng Shi, Maobin Yi, Shaolin Liu, Jie Sun, Weinan Gao

Proceedings Volume 6839, Nonlinear Optics: Technologies and Applications; 68392D (2008) https://doi.org/10.1117/12.759238
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

Sol-gel-processed TiO₂/SiO₂ films doped with organic azo dye have been investigated. The film was spin-coated on the ITO coated glass substrate and rapidly condensed by evaporation of the solvent from the liquid film. The thickness of the hybrid films can be varied from 0.2 to 0.6 micron. When the prehydrolyzed tetraethoxysilane (TEOS) sol and titania precursor(titanium butoxide) are mixed together with various molar ratios, the refractive index of the film may vary from 1.49 to 1.81 at 1300nm. The film is aged at 80°C for 2 h and then corona poled at 120°C for 1 h so that the dye molecules are dispersed in numerous pores of the oxide matrix. The absorbance spectra of the film measured by a UV-visible spectrophotometer show that the process of aging and poling in the sample preparation causes the pores in the oxide matrix to shrink and nonlinear molecules are aligned in the direction of the poling field and are trapped in the pores. The electro-optic coefficient r₃₃is 42 pm/V at a fundamental wavelength of 1300nm. The nonlinearity is stable at 80°C for 2500h at least. The excellent thermal stability of the hybrid organic/inorganic film is an advantage for optical applications.

Citation Download Citation

Alin Hou, Dongcheng Shi, Maobin Yi, Shaolin Liu, Jie Sun, and Weinan Gao "Sol-gel-processed TiO₂/SiO₂ films for electro-optic effect", Proc. SPIE 6839, Nonlinear Optics: Technologies and Applications, 68392D (4 January 2008); https://doi.org/10.1117/12.759238

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