Third-order optical nonlinear absorption in Bi1.95La 1.05TiNbO9 thin films

Hengzhi Chen, Bin Yang, Mingfu Zhang, Feiyan Wang, Kokwai Cheah, Wenwu Cao

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Single phase Bi1.95La1.05TiNbO9 (LBTN-1.05) thin films with a layered aurivillius structure have been fabricated on fused silica substrates by pulsed laser deposition at 700 °C. The X-ray diffraction pattern revealed that the films are single-phase aurivillius. The band gap, linear refractive index and linear absorption coefficient were obtained by optical transmittance measurements. The film exhibits a high transmittance (> 70%) in visible-infrared region and the dispersion relation of the refractive index vs. wavelength follows the single electronic oscillator model. The nonlinear optical absorption property of the film was determined by the single beam Z-scan method using 800 nm with a duration of 100 fs. A large positive nonlinear absorption coefficient β = 5.95 × 10- 8 m/W was determined experimentally. The results showed that the LBTN-1.05 is a promising material for applications in absorbing-type optical devices.

Original languageEnglish (US)
Pages (from-to)5585-5587
Number of pages3
JournalThin Solid Films
Issue number19
StatePublished - Jul 30 2010

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry


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