Z-scan nonlinear optical properties of the Au-SiO<sub>2</sub> nanocomposite thin film

Yuan Hsing Fu; Wei-Chih Hsu; Song-Yeu Tsai; Din Ping Tsai

doi:10.1117/12.580528

28 January 2005 Z-scan nonlinear optical properties of the Au-SiO₂ nanocomposite thin film

Yuan Hsing Fu, Wei-Chih Hsu, Song-Yeu Tsai, Din Ping Tsai

Proceedings Volume 5646, Nonlinear Optical Phenomena and Applications; (2005) https://doi.org/10.1117/12.580528
Event: Photonics Asia, 2004, Beijing, China

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.

Citation Download Citation

Yuan Hsing Fu, Wei-Chih Hsu, Song-Yeu Tsai, and Din Ping Tsai "Z-scan nonlinear optical properties of the Au-SiO₂ nanocomposite thin film", Proc. SPIE 5646, Nonlinear Optical Phenomena and Applications, (28 January 2005); https://doi.org/10.1117/12.580528

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KEYWORDS

Thin films

Gold

Nanocomposites

Absorption

Transmittance

Nanoparticles

Near field

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