Synthesis and Characterization of Highly Oriented Sol-Gel (Pb, La) TiO3 Thin Film Optical Waveguides |
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Authors: | Junmo Koo Kwangsoo No Byeong-Soo Bae |
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Affiliation: | (1) Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Taejon, 305-701, Korea |
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Abstract: | The preparation and the optical characteristics of highly oriented PLT thin films are investigated. PLT films fabricated on MgO(100) and c-plane sapphire substrates have highly grown in (100) and (111) orientations, respectively. PLT films with high La content have a near cubic structure and weak anisotropy of refractive indices. The optical propagation losses of PLT films decrease as the La content of the films increases due to a complex interaction of surface roughness reduction and a reduction in the anisotropy refractive index. However, optical scattering in thicker sol-gel PLT thin film waveguides occurs by the internal scattering mechanism from the defects and the interfaces rather than by the surface scattering mechanism. |
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Keywords: | sol-gel lead lanthanum titanate thin film optical waveguide optical propagation loss |
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