The Last Step in Converting the Surface Plasmonic Energy into Heat by Nanocages and Nanocubes on Substrates

Authors

  • Paul Szymanski,

    1. Laser Dynamics Laboratory, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332–0400, USA
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  • Mahmoud A. Mahmoud,

    1. Laser Dynamics Laboratory, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332–0400, USA
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  • Mostafa A. El-Sayed

    Corresponding author
    1. Laser Dynamics Laboratory, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332–0400, USA
    • Laser Dynamics Laboratory, School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332–0400, USA.

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Abstract

original image

The ultrafast coherent excitation and decay of localized surface plasmons are used to record the coherent oscillations of the medium surrounding nanoparticles resulting from phonon–phonon relaxation processes. The plasmonic nanoparticles used in this study are Ag nanocubes and Au nanocages deposited in a Langmuir–Blodgett monolayer. Using two sub-picosecond laser pulses, low-frequency oscillations resulting from the nanoparticle–substrate coupling are observed.

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