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Nonlinear Optical Absorption and Switching Properties of Gold Nanoparticle Doped SiO2–TiO2 Sol–Gel Films

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Abstract:

The nonlinear optical absorption and switching properties of sol–gel derived of Au nanoparticle doped SiO2–TiO2 sol–gel films having different Au-surface plasmon absorption positions are reported in this paper. The Au nanoparticles are embedded in SiO2 and SiO2–TiO2 mixed glassy film matrices with different refractive index values. To study the nonlinear absorption properties, lasers with three different wavelengths are used. The optical switching behavior is studied by using the pump-probe technique with 532 nm as the excitation wavelength. Ground state conduction band, surface plasmon band, and the free carrier band are taken as three level model to explain theoretically the obtained RSA and SA behaviors.

Keywords: OPTICAL SWITCHING; REVERSE SATURABLE ABSORPTION; SATURABLE ABSORPTION; SURFACE PLASMON RESONANCE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2006.319

Publication date: July 1, 2006

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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