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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 24 — Aug. 20, 2008
  • pp: 4345–4351

Linear and nonlinear optical characteristics of ZnO SiO 2 nanocomposites

Litty Irimpan, Bindu Krishnan, V. P. N. Nampoori, and P. Radhakrishnan  »View Author Affiliations


Applied Optics, Vol. 47, Issue 24, pp. 4345-4351 (2008)
http://dx.doi.org/10.1364/AO.47.004345


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Abstract

We present the spectral and nonlinear optical properties of ZnO SiO 2 nanocomposites prepared by colloidal chemical synthesis. Obvious enhancement of ultraviolet (UV) emission of the samples is observed, and the strongest UV emission of a typical ZnO SiO 2 nanocomposite is over three times stronger than that of pure ZnO. The nonlinearity of the silica colloid is low, and its nonlinear response can be improved by making composites with ZnO. These nanocomposites show self-defocusing nonlinearity and good nonlinear absorption behavior. The observed nonlinear absorption is explained through two photon absorption followed by weak free carrier absoption and nonlinear scattering. The nonlinear refractive index and the nonlinear absorption increase with increasing ZnO volume fraction and can be attributed to the enhancement of exciton oscillator strength. ZnO SiO 2 is a potential nanocomposite material for the UV light emission and for the development of nonlinear optical devices with a relatively small limiting threshold.

© 2008 Optical Society of America

OCIS Codes
(190.4400) Nonlinear optics : Nonlinear optics, materials
(300.1030) Spectroscopy : Absorption
(300.2140) Spectroscopy : Emission
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence

ToC Category:
Nonlinear Optics

History
Original Manuscript: April 16, 2008
Revised Manuscript: June 4, 2008
Manuscript Accepted: June 11, 2008
Published: August 15, 2008

Citation
Litty Irimpan, Bindu Krishnan, V. P. N. Nampoori, and P. Radhakrishnan, "Linear and nonlinear optical characteristics of ZnO-SiO2 nanocomposites," Appl. Opt. 47, 4345-4351 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-24-4345

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