10 September 2014 Comparison of third-order nonlinear optical properties of colloidal gold nanoshells and nanorods
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Abstract
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, Marta Gordel, Joanna Olesiak-Banska, Joanna Olesiak-Banska, Radoslaw Kolkowski, Radoslaw Kolkowski, Katarzyna Matczyszyn, Katarzyna Matczyszyn, Malcolm Buckle, Malcolm Buckle, Marek Samoc, 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); doi: 10.1117/12.2059632; https://doi.org/10.1117/12.2059632
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