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

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

Research output: Journal article publicationConference articleAcademic researchpeer-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 SiO 2 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
Article number102
Pages (from-to)555-562
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume5646
DOIs
Publication statusPublished - Nov 2004
Externally publishedYes
EventNonlinear Optical Phenomena and Applications - Beijing, China
Duration: 8 Nov 200411 Nov 2004

Keywords

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

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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