C - outgrowths in C + thin films of LiNbO 3 on Al 2O 3-c

J. J. Kingston, D. K. Fork, F. Leplingard, Fernando Ponce

Research output: Chapter in Book/Report/Conference proceedingConference contribution

18 Scopus citations


Thin-film waveguides of LiNbO 3 have been grown on Al 2O 3-c by off-axis rf magnetron sputtering. The films have been characterized optically by prism coupling measurements, crystallographically by x-ray diffraction, and morphologically by atomic force microscopy. We find that optical losses can be dominated by scattering from large outgrowths that litter the surface of the film. These outgrowths are c - grains imbedded in a c + matrix. Although some grains nucleate c -, others have their polarity reversed from c + to c - after nucleation. A model will be presented to explain the preferential nucleation of c + grains on Al 2O 3-c. The c - grains grow much faster than the c + ones because of attractive coulombic forces between the c - grains and the ionized Li and Nb species in the sputter plume.

Original languageEnglish (US)
Title of host publicationMaterials Research Society Symposium - Proceedings
PublisherMaterials Research Society
Number of pages6
StatePublished - 1994
Externally publishedYes
EventProceedings of the 1994 MRS Spring Meeting - San Francisco, CA, USA
Duration: Apr 5 1994Apr 7 1994


OtherProceedings of the 1994 MRS Spring Meeting
CitySan Francisco, CA, USA

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials


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