Intrinsic Bistable Photonic Materials by Copper Colloid Formation in Silica.
Final rept. 1 Mar 1991-31 May 1992,
VANDERBILT UNIV NASHVILLE TN
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Ion implantation has been used to assemble planar thin films of metallic nanoclusters embedded in a dielectric. Gold and copper were both found to produce nanosize metal clusters in silica. Both the size and size distribution of the metallic nanoclusters were characterized by transmission electron microscopy. The size and size distribution were found to be controlled by implantation protocols and post implantation processing. The linear and nonlinear optical properties were measured and found to be a function of the cluster size and size distribution. The nonlinear response was electronic in character and has a response time which is no longer than 15 ps. The nonlinear index of refraction of these materials has a magnitude approx. 1O-1Ocm2W-1, comparing favorably to semi-conductor microcrystallites. The linear optical properties were well described by Mie theory while the nonlinear responses can be described by effective medium theory.
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