Resonant absorption quenching and enhancement of optical nonlinearity in Au:BaTiO[sub 3] composite films by adding Fe nanoclusters

Wang, W.T.; Chen, Z.H.; Yang, G.; Guan, D.Y.; Yang, G.Z.; Zhou, Y.L.; Lu, H.B.
September 2003
Applied Physics Letters;9/8/2003, Vol. 83 Issue 10, p1983
Academic Journal
We present an approach to enhance the figure of merit χ[sup (3)]/α (with χ[sup (3)] being the third-order nonlinear susceptibility and α the optical absorption coefficient) in metal-dielectric composites. Nanocomposite thin films containing metal nanoclusters were obtained by embedding gold, or gold+iron in BaTiO[sub 3] matrices using the pulsed laser deposition technique. In the optical absorption spectra, the Au:BaTiO[sub 3] 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 χ[sup (3)] was enhanced so that χ[sup (3)]/α was significantly increased. Our study suggests a method by which to design optical nonlinear materials with large figure of merits for practical application. © 2003 American Institute of Physics.


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