10 October 1997 Giant optical nonlinearities of fractal colloid aggregates
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Abstract
Strong fluctuations oflocal fields may result in huge enhancements ofoptical nonlinearities in metal fractal colloid aggregates. Giant enhancement ofthird order nonlinearities was calculated and obtained experimentally. The real and imaginary parts of the cubic susceptibility of silver colloid aggregates were measured. It was found that the coefficient of nonlinear absorption depends on laser wavelength and intensity strongly. An optical limiting in silver colloid was observed.
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Robert L. Armstrong, Vladimir P. Safonov, Nikolay N. Lepeshkin, Won-Tae Kim, Vladimir M. Shalaev, "Giant optical nonlinearities of fractal colloid aggregates", Proc. SPIE 3146, Nonlinear Optical Liquids and Power Limiters, (10 October 1997); doi: 10.1117/12.279300; https://doi.org/10.1117/12.279300
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