8 October 1999 Nondegenerate four-wave mixing in gold nanocomposites formed by ion implantation
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Abstract
Nondegenerate four-wave mixing technique has been used to investigate the third-order nonlinear susceptibility for nanocomposite material with Au nanocrystals formed inside a SiO2 glass matrix. High concentrations of encapsulated Au nanocrystals are formed by implantation of Au+ ions into fused silica glass substrates and thermal annealing. The size distribution and the depth profiles of the Au nanoparticles can be controlled by the implantation dose, energy and annealing temperatures. The high value of the third-order susceptibility approximately (0.26 - 1.3) X 10-7 esu was found in the range of the frequency detunings (Delta) (1/(lambda) ) -1 near the surface plasmon resonance. Two characteristic relaxation times, 0.66 ps and 5.3 ps, have been extracted from the detuning curve of the third-order susceptibility as the probe-beam frequency changes and the pump-beam frequency fixed at the plasmon resonance. The first relaxation time was attributed to electron-phonon relaxation, and the second to thermal diffusion to the host medium. The efficient nondegenerate conversion is attractive for optical processing.
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Vladimir P. Safonov, Jane G. Zhu, Nikolay N. Lepeshkin, Robert L. Armstrong, Vladimir M. Shalaev, Z. Charles Ying, C. Woody White, Ray A. Zuhr, "Nondegenerate four-wave mixing in gold nanocomposites formed by ion implantation", Proc. SPIE 3788, Switchable Materials and Flat Panel Displays, (8 October 1999); doi: 10.1117/12.365787; https://doi.org/10.1117/12.365787
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