Publikationsdatum:
2015-10-10
Beschreibung:
Au nanoparticles show large third-order nonlinear effect and ultra-fast response. Here a high nonlinear aggregate film based on self-assembled gold nanoparticles is reported and its third-order nonlinear refractive index coefficient is measured by Z-scan experiment. The third-order nonlinear refractive index coefficient of the Au nanoparticle aggregate film ( γ 1 = 9.2 × 10 −9 cm 2 /W) is found to be larger than that of an 8-nm-thick sputtered Au film ( γ 2 = 6.5 × 10 −9 cm 2 /W). This large nonlinear effect can be attributed to the strong field enhancement due to localized plasmon resonances between Au nanoparticles. The result shows that the self-assembled Au nanoparticle aggregate film could be a promising candidate as a third-order nonlinear optical material.
Print ISSN:
0003-6951
Digitale ISSN:
1077-3118
Thema:
Physik
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