Z-scan determination of the third-order optical nonlinearity of gold:silica nanocomposites

被引:124
作者
Debrus, S [1 ]
Lafait, J [1 ]
May, M [1 ]
Pinçon, N [1 ]
Prot, D [1 ]
Sella, C [1 ]
Venturini, J [1 ]
机构
[1] Univ Paris 06, Lab Opt Solides, UMR 7601, F-75252 Paris 05, France
关键词
D O I
10.1063/1.1290260
中图分类号
O59 [应用物理学];
学科分类号
摘要
Third-order nonlinear optical properties of Au:SiO2 thin films were studied at the surface plasmon resonance wavelength by the z-scan technique using a nanosecond laser. Films were prepared by a multilayer deposition sputtering technique. They were composed of 2 nm mean diam gold particles, with a metal volume fraction of 20%. Z-scan measurements performed both with and without aperture showed a very large nonlinear absorption masking the nonlinear refraction. The nonlinear absorption coefficient beta was found to be negative and equal to -1.1x10(-2) cm/W. The different mechanisms contributing to this absorption are discussed and the large value of beta is correlated to the duration of the laser pulses. Moreover, it is shown that a mean field theory is not appropriate to evaluate the effective susceptibility at high metal concentrations. (C) 2000 American Institute of Physics. [S0021- 8979(00)10519-5].
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页码:4469 / 4475
页数:7
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