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Measurement of the dynamics of plasmons inside individual gold nanoparticles using a femtosecond phase-resolved microscope

Masia, Francesco, Langbein, Wolfgang Werner and Borri, Paola 2012. Measurement of the dynamics of plasmons inside individual gold nanoparticles using a femtosecond phase-resolved microscope. Physical Review B: Condensed Matter and Materials Physics 85 (23) , pp. 235403-235413. 10.1103/PhysRevB.85.235403

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Abstract

We demonstrate a phase-sensitive four-wave mixing microscopy in heterodyne detection to resolve the ultrafast changes of the real and imaginary parts of the dielectric function of single small (<40 nm) spherical gold nanoparticles at the surface plasmon resonance. The results are quantitatively described via the transient electron temperature and density in gold considering both intraband and interband transitions. We find that the effect of interband transitions in the excitation is important to explain not only the magnitude of the measured four-wave mixing, but also its initial dynamics, which is dominated by the formation of hot electrons via Auger electron-hole recombination with 70-fs time constant, much faster than the well-characterized 500-fs electron thermalization dynamics for intraband excitation. This microscopy technique enables background-free detection of the complex susceptibility change even in highly scattering environments and can be readily applied to any metal nanostructure.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Physics and Astronomy
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Publisher: American Physical Society
ISSN: 1098-0121
Funders: EPSRC
Last Modified: 11 May 2019 22:25
URI: http://orca.cf.ac.uk/id/eprint/41580

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