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25 October 2011 Nonlinear optical response of silver nanoparticles and silicon quantum dots
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We present a nonlinear optical study using standard Z-scan technique at the picosecond regime, in a nanostructured material containing both quasi-spherical silver nanoparticles and silicon quantum dots, and comparing its response to those from similar systems, one with only silicon quantum dots, and another with only silver nanoparticles. The study was done using different wavelengths, 355 nm and 532 nm, which are localized at both sides of the surface plasmon resonance of the Ag nanoparticles, and 1064 nm, which is localized well far away of it. In general, we have observed that the larger optical nonlinear response came from the sample with silver NPs. However, the combined system showed a positive nonlinear refraction below the plasmon resonance (355 nm), changing to a negative value for wavelengths above resonance (532 nm and 1064 nm). We observed also, for the combined system and for the three wavelengths used, a saturation of the nonlinear refraction index as a function of the incident irradiance.
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L. Tamayo-Rivera, R. C. Fernández-Hernández, J. Bornacelli, L. Rodríguez-Fernández, A. Oliver, and J. A. Reyes-Esqueda "Nonlinear optical response of silver nanoparticles and silicon quantum dots", Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 80113U (25 October 2011);

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