Refractive index change in Ti-diffused near-stoichiometric LiTaO3 waveguide and its relation to Ti-concentration

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Xiao-Fei Yang
  • Zi-Bo Zhang
  • Wing-Han Wong
  • Dao-Yin Yu
  • De-Long Zhang

Detail(s)

Original languageEnglish
Pages (from-to)340-345
Journal / PublicationMaterials Chemistry and Physics
Volume203
Early online date7 Oct 2017
StatePublished - 1 Jan 2018

Abstract

Ti-diffused near-stoichiometric(NS) LiTaO3 multimode planar waveguide was fabricated by diffusion of Ti-film coated onto a congruent LiTaO3 substrate and post Li-rich vapor transport equilibration process. The crystalline phase in the Ti-diffused layer was analyzed by powder x-ray diffraction and the Li2O-content was evaluated from the measured birefringence. The Ti-concentration profile was analyzed by secondary ion mass spectrometry. The modes guided in the planar waveguide were characterized by prism-coupling technique. The refractive index profile was constructed from the measured mode indices, and correlated with the Ti-concentration profile. The results show that the waveguide retains the LiTaO3 phase and is in an NS composition environment. Both the refractive index and Ti-concentration follow Gaussian profile. The extraordinary and ordinary index change profiles are almost same, implying that the electric field profile of the mode guided in the NS Ti:LiTaO3 waveguide would be polarization-insensitive. The ordinary and extraordinary index changes and the Ti-concentration follow a similar exponential relationship with a power index ∼1.3. Comparison shows that the Ti:LiTaO3 waveguide shows considerable differences from the Ti:LiNbO3 in Ti diffusivity, index change profile and its relation to Ti-concentration, and polarization dependence of guided mode.

Research Area(s)

  • Composition, Crystalline phase, Near-stoichiometric Ti:LiTaO3 waveguide, Refractive index change, Ti-concentration

Citation Format(s)

Refractive index change in Ti-diffused near-stoichiometric LiTaO3 waveguide and its relation to Ti-concentration. / Yang, Xiao-Fei; Zhang, Zi-Bo; Wong, Wing-Han; Yu, Dao-Yin; Pun, Edwin Yue-Bun; Zhang, De-Long.

In: Materials Chemistry and Physics, Vol. 203, 01.01.2018, p. 340-345.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal