Sr1.8Ca0.2NaNb5O15 films for electro-optic modulator application

W. C. Liu, Chee Leung Mak, K. H. Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)


Ferroelectric Sr1.8Ca0.2NaNb5O 15 (SCNN) optical thin films have been fabricated on fused quartz substrates using pulsed laser deposition. X-ray diffraction measurements and scanning electron microscopy revealed that these SCNN thin films exhibited a pure tetragonal tungsten-bronze phase polycrystalline crystal structure with good surface morphologies. Their transmittance profiles showed that the films had a transmittance of 80% in the visible range. The optical waveguiding properties of the films were characterized using a coupled prism technique. Distinct m-lines of the guided transverse-electric (TE) and -magnetic (TM) modes of the SCNN waveguides were observed. The TE and TM refractive indices were found to be 2.251 and 2.237, respectively. A simple, direct and reliable technique based on the shift of synchronous angles of the guided modes as a function of the applied electric field was used to investigate the effective electro-optic coefficient, which was determined to be 176.6 pm V-1. We demonstrate that this technique is convenient in studying the effective electro-optics properties for thin films.
Original languageEnglish
Article number105114
JournalJournal of Physics D: Applied Physics
Issue number10
Publication statusPublished - 18 Sept 2009

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films


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