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Proceedings Paper

Z-scan nonlinear optical properties of the Au-SiO2 nanocomposite thin film
Author(s): Yuan Hsing Fu; Wei-Chih Hsu; Song-Yeu Tsai; Din Ping Tsai
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Paper Abstract

Au-SiO2 nanocomposite thin film is fabricated reproducibly by co-sputtering method with the size of Au nano particles around 2 to 10 nm. TEM images display the irregular shape Au nanoparticles are embedded in SiO2 thin film with random distribution. A surface plasmon absorption peak of Au nanoparticles is found in absorption spectra. The nonlinear optical properties are measured by confocal Z-scan method with a sub-nanosecond pulse laser (λ=532nm, pulse width 0.71ns, repetition rate 15.79kHz) and high-numerical-aperture objective lens (NA=0.55). Results of the Z-scan show nonlinear optical properties and enhanced transmittance at the focusing position of nanocomposite Au-SiO2 films. The transmittance can be more than 135% for a 15-nm-thick Au-SiO2 nanocomposite thin film with an average grain size of around 5 nm.

Paper Details

Date Published: 28 January 2005
PDF: 8 pages
Proc. SPIE 5646, Nonlinear Optical Phenomena and Applications, (28 January 2005); doi: 10.1117/12.580528
Show Author Affiliations
Yuan Hsing Fu, National Taiwan Univ. (Taiwan)
Wei-Chih Hsu, Industrial Technology Research Institute (Taiwan)
Song-Yeu Tsai, Industrial Technology Research Institute (Taiwan)
Din Ping Tsai, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 5646:
Nonlinear Optical Phenomena and Applications
Qihuang Gong; Yiping Cui; Roger A. Lessard, Editor(s)

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