Study of structural faults in Ti-diffused lithium niobate

Twigg, M. E.; Maher, D. M.; Nakahara, S.; Sheng, T. T.; Holmes, R. J.
March 1987
Applied Physics Letters;3/2/1987, Vol. 50 Issue 9, p501
Academic Journal
Transmission electron microscope studies of Ti-doped, congruent lithium niobate (LiNbO3) have shown that extended structural faults are only present within the Ti-diffused layer (i.e., the wave guiding 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 and therefore it is appealing to suggest that these defects are responsible for the creation of structural faults. Since the extent of these structural faults 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.


Related Articles

  • Imaging conoscope for investigation of optical inhomogeneity in large boules of uniaxial crystals Bajor, Andrzej L.; Salbut, Leszek; Szwedowski, Andrzej; Piatkowski, Tadeusz // Review of Scientific Instruments;Mar98, Vol. 69 Issue 3, p1476 

    Examines the use of imaging conoscope to investigate optical inhomogeneity of lithium niobate crystals. Factors contributing to inhomogeneous distribution of residual stresses, dislocations and doping ions; Accuracy of equations for crystallographic orientations; Visibility of isochromatic...

  • Highly optical damage resistant crystal: Zirconium-oxide-doped lithium niobate. Kong, Yongfa; Liu, Shiguo; Zhao, Yanjun; Liu, Hongde; Chen, Shaolin; Xu, Jingjun // Applied Physics Letters;8/20/2007, Vol. 91 Issue 8, p081908 

    Usage of lithium niobate in nonlinear optics is seriously hampered by optical damage, in particular, where high intensity is needed. Doping with magnesium can improve its resistance against optical damage. However, since a rather large dopant concentration is required (more than 4.6 mol % MgO)...

  • Coexistence of Li and Nb vacancies in the defect structure of pure LiNbO3 and its relationship to optical properties. Abdi, F.; Fontana, M. D.; Aillerie, M.; Bourson, P. // Applied Physics A: Materials Science & Processing;Jun2006, Vol. 83 Issue 3, p427 

    We present a model of the structure of intrinsic defects in lithium niobate, which is based upon the coexistence of both lithium and niobium vacancies. The contents of the various kinds of intrinsic defects were thus determined as a function of the composition in off-congruent crystals. The...

  • Optically-induced defect states in photonic lattices: formation of defect channels, directional couplers, and disordered lattices leading to Anderson-like light localization. Kanshu, A.; Rüter, C.; Kip, D.; Shandarov, V. // Applied Physics B: Lasers & Optics;Jun2009, Vol. 95 Issue 3, p537 

    Formation of defect states by optical induction in one-dimensional photonic lattices fabricated in photorefractive lithium niobate is investigated experimentally. First, by using a moving narrow laser beam for defect recording, we investigate light propagation in samples containing single line...

  • Optical characterization of erbium doped LiNbO3 poling properties. Paturzo, M.; Grilli, S.; Ferraro, P.; Finizio, A.; De Natale, P.; Argiolas, N.; Bazzan, M.; Ciampolillo, M. V.; Sada, C. // Journal of Applied Physics;Jul2008, Vol. 104 Issue 1, p014103 

    We investigate the characteristics of the poling process of two samples of Er:LiNbO3 grown by the Chzocralski technique by comparing their optical properties. The first has a multidomain structure and shows some optical inhomogeneities probably due to lattice defects; the second, poled at the...

  • Thermal hysteresis of nonlinear ultrasonic attenuation in lithium niobate. Breazeale, Mack A.; Ostrovskii, Igor V.; McPherson, Michael S. // Journal of Applied Physics;9/1/2004, Vol. 96 Issue 5, p2990 

    A type of nonlinear ultrasound attenuation in ferroelectric crystals is reported. It consists of a strong hysteresis under thermal cycling, a nonexponential echo train pattern which cannot be explained by a nonparallelism of the samples, and decreasing of the insertion losses under increasing...

  • Shape of ferroelectric domains in LiNbO3 and LiTaO3 from defect/domain-wall interactions. Lee, Donghwa; Xu, Haixuan; Dierolf, Volkmar; Gopalan, Venkatraman; Phillpot, Simon R. // Applied Physics Letters;2/28/2011, Vol. 98 Issue 9, p092903 

    The observed orientations and shapes of ferroelectric domains in stoichiometric and congruent LiTaO3 and LiNbO3 are explained in terms of the differences in the energetics of domain walls, and the energetics of defect/domain-wall interactions. Density functional theory calculations show that the...

  • Synthesis and waveguiding of single-crystalline LiNbO3 nanorods. Huang, Jingyun; Chen, Zhong; Zhang, Zesong; Zhu, Chongyu; He, Haiping; Ye, Zhizhen; Qu, Guangyuan; Tong, Limin // Applied Physics Letters;2/28/2011, Vol. 98 Issue 9, p093102 

    Single-crystalline LiNbO3 nanorods with a trigonal rhombic crystal structure are synthesized through hydrothermal reaction with KOH, LiOH·H2O, and Nb2O5 as source materials. LiNbO3 nanorods were along the [110] crystallographic direction. KOH was found to be essential for the formation of one...

  • Tunable multilayer narrowband filter containing an ultrathin metallic film and a lithium niobate defect. Chang, Yang-Hua; Liu, Chi-Chung; Yang, Tzong-Jer; Wu, Chien-Jang // Optical & Quantum Electronics;May2011, Vol. 42 Issue 6/7, p359 

    By using lithium niobate (LiNbO) as a defect layer, a tunable multilayer narrowband reflection-and-transmission filter containing an ultrathin metallic film is proposed. Due to the voltage dependence of the refractive index for LiNbO, tunable optical filtering properties have been theoretically...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics