Masia, Francesco  ORCID: https://orcid.org/0000-0003-4958-410X, Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023 and Borri, Paola ORCID: https://orcid.org/0000-0002-7873-3314
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
|
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: | 09 Nov 2022 07:56 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/41580 |
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