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23 April 2008 Large nonlinear refraction in gold island films under nano- and femto-second laser pulse excitation
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Abstract
Giant nonlinear refraction has been experimentally observed in gold island films. The real part of the third-order nonlinear susceptibility χ(3)(ω;ω,-ω,ω) reaches a value of -8×10-5 esu (λ = 532 nm, τ = 10 ns) and +5×10-7 esu (λ = 800 nm, τ = 85 fs). The mechanism of nonlinearity of the refractive index can be associated with the resonance enhancement of the factor of the local optical field at the pump wavelength due to the excitation of surface plasmons, as well as with the contribution of the heating of conduction electrons in an ensemble of metal particles.
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A. Borshch, M. Brodyn, R. Fedorovich, V. Liakhovetskyi, P. Tomchuk, V. Volkov, L. Makarovsky, Yu. Nikitaev, and F. Gostev "Large nonlinear refraction in gold island films under nano- and femto-second laser pulse excitation", Proc. SPIE 6988, Nanophotonics II, 69881L (23 April 2008); https://doi.org/10.1117/12.778295
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