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Annealing Induced Aggregations and Sign Alterations of Nonlinear Absorption and Refraction of Dense Au Nanoparticles in TiO2 Films |
PENG Xiao-Niu, LI Min, YU Liao, ZHANG Xian, ZHOU Li |
Key Laboratory of Acoustic and Photonic Materials and Devices of Ministry of Education, Department of Physics, Wuhan University, Wuhan 430072 |
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Cite this article: |
PENG Xiao-Niu, LI Min, YU Liao et al 2008 Chin. Phys. Lett. 25 4171-4173 |
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Abstract Au-TiO2 dis-conductive composite films with Au atom concentrate as high as 82% are prepared by using reactive co-sputtering technique. The annealing effect on the nanostructures and optical nonlinearities of the composite films are investigated. Au nanoparticles aggregated to semi-continuum network structures during the annealing processes. As the annealing temperature increases from 25°C to 400°C, the surface plasmon absorption band is shifted and its strength is increased, consequently, the nonlinear absorption coefficient β decreases from 5.6×104cm/GW to -1.7×104cm/GW, while the nonlinear refractive index γ increases from -0.95cm2/GW to 1.3cm2/GW.
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Keywords:
81.40.-z
42.65.Jx
78.20.Ci
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Received: 05 June 2008
Published: 25 October 2008
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PACS: |
81.40.-z
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(Treatment of materials and its effects on microstructure, nanostructure, And properties)
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42.65.Jx
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(Beam trapping, self-focusing and defocusing; self-phase modulation)
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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