Thermo-optic properties of epitaxial Sr0.6Ba0.4Nb2O6waveguides and their application as optical modulator

Wen Chao Liu, Chee Leung Mak, Kin Hung Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)


A prism-coupler technique was introduced to determine the refractive indices and thermo-optic coefficients of epitaxial Sr0.6Ba0.4Nb2O6(SBN) waveguides, in a temperature range covering the ferroelectricparaelectric phase transition. A strong enhancement in the TO coefficient is observed near Tc. This strong enhancement is related to the critical change of the polarization. The values of/edn dT are significantly larger than/odn dT due to the larger quadratic electro-optic coefficient in TM polarization. In TM mode, the refractive index of SBN is increased by 1.3% as the temperature is increased to 160°C. Our results suggest that SBN waveguide is a potential candidate for thermo-optic modulators and switches.
Original languageEnglish
Pages (from-to)13677-13684
Number of pages8
JournalOptics Express
Issue number16
Publication statusPublished - 3 Aug 2009

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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