Marta Gordel,1,2 Joanna Olesiak-Banska,1 Radoslaw Kolkowski,1,3 Katarzyna Matczyszyn,1 Malcolm Buckle,2 Marek Samoc1
1Wroclaw Univ. of Technology (Poland) 2Lab. de biologie et de pharmacologie appliquée, CNRS, Ecole Normale Supérieure de Cachan (France) 3Lab. de photonique quantique et moléculaire, Ecole Normale Supérieure de Cachan (France)
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A detailed comparison of third-order nonlinear optical properties of colloidal gold nanoshells (NSs) and gold nanorods (NRs) in water solutions has been carried out with the open- and closed-aperture Z-scan measurements, performed with femtosecond laser pulses over a broad range of wavelengths. Absorption saturation was found to be a dominant effect for all the studied nanoparticles, however two-photon absorption properties are also detected, especially at the shortest wavelengths studied. The value of the merit factor σ2/M (two-photon absorption cross section scaled by the molecular weight) for the NRs (10nm × 35 nm) at 530 nm is 7.5 (GM·mol/g), while for the NSs is 1.9 (GM·mol/g) at the same wavelength.
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Marta Gordel, Joanna Olesiak-Banska, Radoslaw Kolkowski, Katarzyna Matczyszyn, Malcolm Buckle, Marek Samoc, "Comparison of third-order nonlinear optical properties of colloidal gold nanoshells and nanorods," Proc. SPIE 9163, Plasmonics: Metallic Nanostructures and Their Optical Properties XII, 91630V (10 September 2014); https://doi.org/10.1117/12.2059632