Optical waveguide and nonlinear properties of Bi3NdTi3O12 thin films

Abstract

Neodymium-substituted bismuth titanate (Bi3NdTi3O12, BNT) thin films were prepared on quartz substrates by a metal-organic solution deposition process. The crystalline structure was evaluated by X-ray diffraction. Waveguide property was investigated by using prism coupling technique and optical transmittance measurement. The optical nonlinearities of the film were measured by the top-hat Z-scan techniques and a large positive nonlinear refractive index, nonlinear refractive coefficient and two-photon absorption coefficient were determined to be 3.84 × 10−7 esu, 0.7523 cm2/GW and 4.81 × 104 cm/GW, respectively. These results reveal that the BNT film may be a kind of new multifunctional materials.