Dependence of the two-photon photoluminescence yield of gold nanostructures on the laser pulse duration
(2009) Physical review. B, Condensed matter and materials physics — Vol. 80, n° 4 (2009)
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- Two-photon photoluminescence (TPPL) from gold nanostructures is becoming one of the most relevant tools for plasmon-assisted biological imaging and photothermal therapy as well as for the investigation of plasmonic devices. Here we study the yield of TPPL as a function of the temporal width delta of the excitation laser pulses for a fixed average power. In the delta > 1 ps regime, the TPPL yield decreases as delta is increased, while for shorter pulse widths it becomes independent of delta and, consequently, of the laser-pulse peak power. This peculiar dynamics is understood and modeled by considering that two-photon absorption in Au is a two-step process governed by the lifetime of the metastable state populated by the first photon absorption.
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Biagioni, P., Celebrano, M., Savoini, M., Grancini, G., Brida, D., Mátéfi-Tempfli, S., Mátéfi-Tempfli, M.-R., Duo, L., Hecht, B., Cerullo, G., & Finazzi, M. (2009). Dependence of the two-photon photoluminescence yield of gold nanostructures on the laser pulse duration. Physical review. B, Condensed matter and materials physics, 80(4). https://doi.org/10.1103/PhysRevB.80.045411 (Original work published 2009)