Optical depth profiling of strontium titanate and electro-optic lanthanum-modified lead zirconium titanate multilayer structures for active waveguide applications

Aram Amassian*, M. Gaidi, M. Chaker, L. Martinu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Transparent polycrystalline strontium titanate (STO) and lanthanum-modified lead zirconium titanate (PLZT) thin films were deposited, respectively, on Si and on indium-doped tin oxide (ITO) coated glass by pulsed laser deposition (PLD). PLZT films are shown to exhibit electro-optic properties close to the bulk material when deposited on ITO in specific process conditions. The refractive index depth profile was determined by using a combination of variable angle spectroscopic ellipsometry and spectrophotometry, and the multisample analysis approach. PLZT films deposited at high O2 pressure, P O2, and annealed at 700 °C were found to be more porous and inhomogeneous than low P O2 films. The optical properties of STO films strongly depend on P O2 as well: low P O2 depositions lead to denser film growth with homogeneous, bulk-like refractive index profile, while high P O2 depositions lead to porous and highly inhomogeneous films, exhibiting band-gap variation and formation of a 60-nm -thick interdiffusion layer on Si. We use an optical depth-profiling procedure to investigate the formation of three-layer air/PLZT/STO/ITO/glass stacks, where the PLZT and STO optical properties are optimized by controlling P O2 during STO deposition, in order to form a cladding layer for potential active waveguide applications.

Original languageEnglish (US)
Pages (from-to)55-64
Number of pages10
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume24
Issue number1
DOIs
StatePublished - Jan 1 2006

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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