Abstract
In this work, we present the experimental study of the nonlinear absorption of gold nanospheres and nanorods in aqueous suspension, using picosecond white-light supercontinuum open-aperture Z-scan. We demonstrate a saturable absorption effect in all particle suspensions at low-pulse energy. In the high-pulse energy regime, the apparent reverse-saturable absorption, observed in gold nanorods, was determined to be induced by photodegradation. Using the Lorentzian deconvolution method for the absorption spectra, we explain the variations on nonlinear optical effects and prove that saturable absorption only occurs within the plasmonic bands.
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Acknowledgments
This research was supported by startup funds provided to FEH by the Department of Chemistry, University of Central Florida. LDB would like to acknowledge CAPES (Brazil) for the financial support through project 4169/06-9.
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De Boni, L., Wood, E.L., Toro, C. et al. Optical Saturable Absorption in Gold Nanoparticles. Plasmonics 3, 171–176 (2008). https://doi.org/10.1007/s11468-008-9071-1
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DOI: https://doi.org/10.1007/s11468-008-9071-1