Surface plasmon-based detection for picosecond ultrasonics in planar gold-dielectric layer geometries

Abstract

Longitudinal acoustic modes in planar thin gold films are excited and detected by a combination of ultrafast pump-probe photoacoustic spectroscopy and a surface plasmon resonance (SPR) technique. The resulting high sensitivity allows the detection of acoustic modes up to the 7th harmonic (258 GHz) with sub-pm amplitude sensing capabilities. This makes a comparison of damping times of individual modes possible. Further, the dynamics of the real and imaginary part of the dielectric function and the film's thickness variation are separated by using the dependence of the amplitudes of the acoustic modes on the detection angle and the surface plasmon resonance. We find that longitudinal acoustic modes in the gold films mainly affect the real part of the dielectric function and highlight the importance to consider thickness related effects in acousto-plasmonic sensing.

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Cite

BibTeX RIS

BibTeX

@article{noll2026surface,
  title = {{Surface plasmon-based detection for picosecond ultrasonics in planar gold-dielectric layer geometries}},
  author = {F. Noll and N. Krauß and V. Gusev and T. Dekorsy and M. Hettich},
  journal = {Photoacoustics},
  year = {2026},
  month = oct,
  doi = {10.1016/j.pacs.2023.100464},
  url = {https://hal.science/hal-05779028v1},
  note = {CC BY-NC-ND},
}

RIS

TY  - JOUR
TI  - Surface plasmon-based detection for picosecond ultrasonics in planar gold-dielectric layer geometries
AU  - F. Noll
AU  - N. Krauß
AU  - V. Gusev
AU  - T. Dekorsy
AU  - M. Hettich
PY  - 2026
DA  - 2026/10/05
JO  - Photoacoustics
DO  - 10.1016/j.pacs.2023.100464
UR  - https://hal.science/hal-05779028v1
AB  - Longitudinal acoustic modes in planar thin gold films are excited and detected by a combination of ultrafast pump-probe photoacoustic spectroscopy and a surface plasmon resonance (SPR) technique. The resulting high sensitivity allows the detection of acoustic modes up to the 7th harmonic (258 GHz) with sub-pm amplitude sensing capabilities. This makes a comparison of damping times of individual modes possible. Further, the dynamics of the real and imaginary part of the dielectric function and the film's thickness variation are separated by using the dependence of the amplitudes of the acoustic modes on the detection angle and the surface plasmon resonance. We find that longitudinal acoustic modes in the gold films mainly affect the real part of the dielectric function and highlight the importance to consider thickness related effects in acousto-plasmonic sensing.
SN  - 2213-5979
ER  -

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