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Optical nonlinearity of nanocrystalline Au/ZnO composite films

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Abstract

The third-order nonlinear optical susceptibilities, χ3, of composite films consisting of nanocrystalline Au and ZnO particles were investigated by use of a degenerate four-wave mixing scheme. The maximum value of χ3, measured at a laser wavelength of 532 nm and a pulse duration of 70 ps, was 2×10-6esu. Also, this χ3 value was achieved with small absorption (the surface-plasmon peak was at the 615-nm wavelength). Our composite materials showed no discernible degradation after they were subjected to irradiation for a total of 3×107 high-intensity pulses (24 Mw/cm2, 70-ps pulse duration at 500 Hz) during 16 h of testing.

© 2003 Optical Society of America

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