| Original Articles |
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Multilayer Au/TiO2Composite Films with Ultrafast Third-Order Nonlinear Optical Properties |
| LONG Hua, YANG Guang, CHEN Ai-Ping, LI Yu-Hua, LU Pei-Xiang |
| Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074 |
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| Cite this article: |
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LONG Hua, YANG Guang, CHEN Ai-Ping et al 2008 Chin. Phys. Lett. 25 4135-4138 |
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Abstract We report on the ultrafast third-order optical nonlinearity in multilayer Au/TiO2 composite films fabricated on quartz substrates by pulsed laser deposition technique. The linear optical properties of the films are determined and optical absorption peaks due to surface plasmon resonance of Au particles are observed at about 590nm. The third-order optical nonlinearities of the films are investigated by z-scan method using a femtosecond laser (50fs) at the wavelength of 800nm. The sample showed fast nonlinear optical responses with nonlinear absorption coefficient and nonlinear refractive index being -3.66×10-10m/W and -2.95×10-17m2/W, respectively. The results also show that the nonlinear optical effects increase with the increasing Au concentration in the composite films.
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| Keywords:
78.20.-e
81.15.Fg
42.65.-k
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Received: 28 May 2008
Published: 25 October 2008
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| PACS: |
78.20.-e
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(Optical properties of bulk materials and thin films)
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81.15.Fg
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(Pulsed laser ablation deposition)
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42.65.-k
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(Nonlinear optics)
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