Optical properties of gold nanocluster composites formed by deep ion implantation in silica

Planar layers of Au clusters with diameters between 5 and 30 nm were synthesized by implanting 2.75‐MeV Au+ ions in fused silica. The metal‐glass composite layer was 0.85 μm below the surface and had a width of 0.5 μm. Thermal annealing enhanced the optical absorption of the annealed samples near 2.4 eV. The third‐order nonlinear optical response time is ≤35 ps; the magnitude of the effective nonlinear susceptibility is 200 times that of similar clusters embedded in ruby‐gold melt glass.

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