Applied Physics B

, Volume 90, Issue 3–4, pp 547–556

Nonlinear optical characteristics of self-assembled films of ZnO

  • Litty Irimpan
  • A. Deepthy
  • Bindu Krishnan
  • V.P.N. Nampoori
  • P. Radhakrishnan
Article

Abstract

In the present work, we have investigated the nonlinear optical properties of self-assembled films formed from ZnO colloidal spheres by z-scan technique. The sign of the nonlinear component of refractive index of the material remains the same; however, a switching from reverse saturable absorption to saturable absorption has been observed as the material changes from colloid to self-assembled film. These different nonlinear characteristics can be mainly attributed to ZnO defect states and electronic effects when the colloidal solution is transformed into self-assembled monolayers. We investigated the intensity, wavelength and size dependence of saturable and reverse saturable absorption of ZnO self-assembled films and colloids. Values of the imaginary part of third-order susceptibility are calculated for particles of size in the range 20–300 nm at different intensity levels ranging from 40 to 325 MW/cm2 within the wavelength range of 450–650 nm.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Litty Irimpan
    • 1
  • A. Deepthy
    • 2
  • Bindu Krishnan
    • 3
  • V.P.N. Nampoori
    • 1
  • P. Radhakrishnan
    • 1
  1. 1.International School of PhotonicsCochin University of Science and TechnologyCochinIndia
  2. 2.Amrita Institute of Medical SciencesCochinIndia
  3. 3.Centre for Materials for Electronics TechnologyThrissurIndia

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