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

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

*Corresponding author for this work

Research output: Chapters, Conference Papers, Creative and Literary WorksRGC 32 - Refereed conference paper (with host publication)peer-review

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.
Original languageEnglish
Title of host publicationNonlinear Optical Phenomena and Applications
EditorsQihuang Gong, Yiping Cui, Roger A. Lessard
PublisherSPIE
Pages555-562
DOIs
Publication statusPublished - 2005
Externally publishedYes
EventPhotonics Asia - Beijing, China
Duration: 8 Nov 200410 Nov 2004

Publication series

NameProceedings of SPIE
Volume5646
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferencePhotonics Asia
Country/TerritoryChina
CityBeijing
Period8/11/0410/11/04

Research Keywords

  • Au/SiO2
  • Localized surface plasmon
  • Nanocomposite
  • Nonlinear optics
  • Z-scan measurement

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