ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Transmission electron microscope studies of Ti-doped, congruent lithium niobate (LiNbO3) have shown that extended structural faults and domain boundaries are only present within the Ti-diffused layer (i.e., the waveguiding region). Structural faults have also been observed in undoped Li-deficient LiNbO3, though not in undoped control crystals of congruent and stoichiometric LiNbO3. In both Ti-doped and Li-deficient LiNbO3, crystal chemistry predicts an increase in the concentration of the point defects V'''''Nb and Nb⋅⋅⋅⋅Li. Therefore, it appears that the coalescence of these defects is responsible for the creation of structural faults. Since the extent of these structural faults and domain boundaries is tens of microns, they are clearly potential scattering sites for photons. In this regard, a systematic understanding of their origin and thermal stability is crucial to integrated optical device technologies based on LiNbO3 and on the Ti-doped waveguide fabrication technique.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.340393
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