Journal
APPLIED PHYSICS LETTERS
Volume 83, Issue 10, Pages 1983-1985Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1606876
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We present an approach to enhance the figure of merit chi((3))/alpha (with chi((3)) being the third-order nonlinear susceptibility and alpha the optical absorption coefficient) in metal-dielectric composites. Nanocomposite thin films containing metal nanoclusters were obtained by embedding gold, or gold+iron in BaTiO3 matrices using the pulsed laser deposition technique. In the optical absorption spectra, the Au:BaTiO3 films showed a strong absorption peak around 562 nm due to surface plasmon resonance of Au particles. However, when a small amount of Fe was added, the resonant absorption was quenched, and chi((3)) was enhanced so that chi((3))/alpha was significantly increased. Our study suggests a method by which to design optical nonlinear materials with large figure of merits for practical application. (C) 2003 American Institute of Physics.
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