Compositional characterisation of Zn-diffused lithium niobate waveguides |
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| Authors: | R Nevado C Sada F Segato F Caccavale A Kling JC Soares E Cantelar F Cussó G Lifante |
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| Institution: | (1) Departamento de Física de Materiales, C-IV, Universidad Autónoma de Madrid, 28 049 Madrid, Spain, ES;(2) INFM and Dipartimento di Fisica, Universitá degli Studi di Padova, Italy, IT;(3) Centro de Física Nuclear da Universidade de Lisboa, 1699 Lisboa Codex, Portugal, PT |
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| Abstract: | Rutherford backscattering (RBS) and secondary-ion mass spectrometry techniques have been used to investigate the two-step
process involved during waveguide fabrication in LiNbO3 using Zn-vapour diffusion. Compositional analysis (O, Nb, Li and Zn) in the two steps has been characterised. RBS analysis
reveals that the first step, involving a heating of the substrate under a metallic Zn atmosphere, gives rise to a partial
exchange between the Nb and Li ions from the crystals and the Zn from the vapour source. The second treatment at higher temperature
in an open atmosphere diffuses the Zn deeper into the substrate, thus forming an optical waveguide, while the Nb and Li ions
recover their bulk values.
Received: 16 May 2001 / Revised version: 7 September 2001 / Published online: 30 October 2001 |
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| Keywords: | PACS: 42 82 -m 66 30 -h 82 80 Yc 68 49 Sf |
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