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Tailoring optical properties of TiO2 in silica glass for limiting applications |
| S. Divya, Indu Sebastian, V. P. N. Nampoori, P. Radhakrishnan, A. Mujeeb |
| International School of Photonics, Cochin University of Science and Technology, Cochin, Kerala, India |
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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.
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Received: 09 June 2013
Revised: 25 July 2013
Accepted manuscript online:
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PACS:
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42.65.-k
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(Nonlinear optics)
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42.70.Nq
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(Other nonlinear optical materials; photorefractive and semiconductor materials)
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42.70.Nq
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(Other nonlinear optical materials; photorefractive and semiconductor materials)
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| Fund: Project supported by the Department of Science & Technology of India. |
Corresponding Authors:
S. Divya
E-mail: divyasasi7@gmail.com
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Cite this article:
S. Divya, Indu Sebastian, V. P. N. Nampoori, P. Radhakrishnan, A. Mujeeb Tailoring optical properties of TiO2 in silica glass for limiting applications 2014 Chin. Phys. B 23 034210
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