Applied Physics B

, Volume 65, Issue 4, pp 673–676

Large third-order nonlinear optical susceptibility of Au-Al2O3 composite films near the resonant frequency

Authors

  • H.B. Liao
    • Department of Physics, the Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
  • R.F. Xiao
    • Department of Physics, the Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
  • J.S. Fu
    • Department of Physics, the Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
  • G.K.L. Wong
    • Department of Physics, the Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong

DOI: 10.1007/s003400050331

Cite this article as:
Liao, H., Xiao, R., Fu, J. et al. Appl Phys B (1997) 65: 673. doi:10.1007/s003400050331

2

O3 composite films with high Au concentrations (30%–60% in volume fraction) were prepared by reactive co-sputtering and post rapidly thermal annealing. The structure of the films and the size distributions of the Au nanoclusters were examined by TEM, and the third-order nonlinear optical susceptibility χ(3) was measured by degenerated four-wave mixing using a 70-ps pulse laser at 532 nm. The maximum value of the χ(3) was about 1.2×10-6 esu in the annealed films and occurred at around 45% Au concentration. The figure of merit, χ(3)/α (α is the absorption coefficient), has a value of 7×10-12 esu cm over a wide range of Au concentrations.

PACS: 42.65.An; 68.55.Jk; 78.66.Sq

Copyright information

© Springer-Verlag 1997