Optical Saturable Absorption in Gold Nanoparticles

    Authors

    L. De Boni; E. L. Wood; C. Toro;F. E. Hernandez

    Comments

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    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.

    Journal Title

    Plasmonics

    Volume

    3

    Issue/Number

    4

    Publication Date

    1-1-2008

    Document Type

    Article

    First Page

    171

    Last Page

    176

    WOS Identifier

    WOS:000263068900008

    ISSN

    1557-1955

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