Two-photon absorption (TPA) has potential applications in three-dimensional imaging, nanosculpting and photodynamic therapy. However, meager TPA cross-sections limit the utility of TPA as a technology. Previous studies in our group and others indicate the ability of using the strong electric fields of plasmonic particles such as gold nanorods to enhance effective TPA cross-sections. In this work, we use a modified pump-probe technique based on gain, i.e., stimulated emission modulation, to determine two-photon properties. We study the distance-dependent two-photon cross-section enhancement of a designer TPA chromophore on gold nanorods with polymer spacer layers.

Two-photon absorption enhancement of dye-modified gold nanorods studied by gain modulation

248th National Meeting (2014)

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