中国物理B ›› 2014, Vol. 23 ›› Issue (3): 34210-034210.doi: 10.1088/1674-1056/23/3/034210

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Tailoring optical properties of TiO2 in silica glass for limiting applications

S. Divya, Indu Sebastian, V. P. N. Nampoori, P. Radhakrishnan, A. Mujeeb   

  1. International School of Photonics, Cochin University of Science and Technology, Cochin, Kerala, India
  • 收稿日期:2013-06-09 修回日期:2013-07-25 出版日期:2014-03-15 发布日期:2014-03-15
  • 基金资助:
    Project supported by the Department of Science & Technology of India.

Tailoring optical properties of TiO2 in silica glass for limiting applications

S. Divya, Indu Sebastian, V. P. N. Nampoori, P. Radhakrishnan, A. Mujeeb   

  1. International School of Photonics, Cochin University of Science and Technology, Cochin, Kerala, India
  • Received:2013-06-09 Revised:2013-07-25 Online:2014-03-15 Published:2014-03-15
  • Contact: S. Divya E-mail:divyasasi7@gmail.com
  • Supported by:
    Project supported by the Department of Science & Technology of India.

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摘要： We present the linear and nonlinear optical studies on TiO2–SiO2 nanocomposites with varying compositions. Optical band gap of the material is found to vary with the amount of SiO2 in the composite. The phenomenon of two-photon absorption (TPA) in TiO2/SiO2 nanocomposites has been studied using open aperture Z-scan technique. The nanocomposites show better nonlinear optical properties than pure TiO2, which can be attributed to the surface states and weak dielectric confinement of TiO2 nanoparticles by SiO2 matrix. The nanocomposites are thermally treated and similar studies are performed. The anatase form of TiO2 in the nanocomposites shows superior properties relative to the amorphous and rutile counterpart. The involved mechanism is explained by rendering the dominant role played by the excitons in the TiO2 nanoparticles.

关键词: reverse saturable absorption (RSA), optical limiting, excitons

Abstract: We present the linear and nonlinear optical studies on TiO2–SiO2 nanocomposites with varying compositions. Optical band gap of the material is found to vary with the amount of SiO2 in the composite. The phenomenon of two-photon absorption (TPA) in TiO2/SiO2 nanocomposites has been studied using open aperture Z-scan technique. The nanocomposites show better nonlinear optical properties than pure TiO2, which can be attributed to the surface states and weak dielectric confinement of TiO2 nanoparticles by SiO2 matrix. The nanocomposites are thermally treated and similar studies are performed. The anatase form of TiO2 in the nanocomposites shows superior properties relative to the amorphous and rutile counterpart. The involved mechanism is explained by rendering the dominant role played by the excitons in the TiO2 nanoparticles.

Key words: reverse saturable absorption (RSA), optical limiting, excitons

中图分类号:  (Nonlinear optics)

  • 42.65.-k
42.70.Nq (Other nonlinear optical materials; photorefractive and semiconductor materials) 42.70.Nq (Other nonlinear optical materials; photorefractive and semiconductor materials)