Optical properties of fluorinated silicon oxide and organic spin-on-glass films for thin-film optical waveguides

Tetsuya Homma, Yuhji Ariyama, Hiroyasu Kondo, Masaya Sakamoto, Shigeru Kanegae, Masahiro Itoh, Masaki Yamaguchi, Hideo Takahashi

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Optical properties of fluorinated silicon oxide (SiOF) and organic spin-on-glass (SOG) films in optical waveguide structures are investigated. The SiOF film for a core layer in an optical waveguide was formed at 23°C by a liquid-phase deposition (LPD) technique using a supersaturated hydrofluosilicic acid (H2SiF6) aqueous solution. The deposition rate using aluminum (Al) for supersaturation in LPD was around 42-50 nm/h. A siloxane-based SOG film was also evaluated for a cladding layer. Although the weak absorption peaks for fundamental vibration of the Si-OH bond in the Fourier transform infrared spectra are observed for thick LPD-SiOF films, the absorption bands for the H-OH bond are under the detection limit. The absorption peaks of Si-OH and H-OH bonds for the organic SOG films were negligibly small. The deviation ranges of refractive indices with thickness difference for the LPD-SiOF and organic SOG films were lower than 0.005 (<0.35%) and 0.01 (<0.71%), respectively, in the wavelengths ranging from 400 to 860 nm. The dispersion of the refractive index measured by spectroellipsometry agreed well with fitting results for both films in the measurement wavelengths ranging from 400 to 860 nm. In the measurement wavelength region, the organic SOG film kept lower refractive indices than the LPD-SiOF film. Any absorption due to water was not observed for the transmittance spectra in the wavelengths ranging from 350 to 2500 nm.

Original languageEnglish
Pages (from-to)1141-1144
Number of pages4
JournalJournal of the Electrochemical Society
Volume147
Issue number3
DOIs
Publication statusPublished - 2000 Mar 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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