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Measurement of shorter-than-skin-depth acoustic pulses in a metal film via transient reflectivity

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.4826210· OSTI ID:1557652
 [1];  [2];  [2];  [3];  [3];  [4];  [5];  [5];  [2]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Office of Scientific and Technical Information (OSTI)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Université du Maine, Le Mans (France)
  4. IFW Dresden (Germany)
  5. Univ. of Wisconsin, Madison, WI (United States)
The detection of ultrashort laser-generated acoustic pulses at a metal surface and the reconstruction of the acoustic strain profile are reported on. A 2 ps-long acoustic pulse generated in an SrRuO3 layer propagates through an adjacent gold layer and is detected at its surface by a reflected probe pulse. We show that the intricate shape of the transient reflectivity waveform and the ability to resolve acoustic pulses shorter than the optical skin depth are controlled by a single parameter, which is determined by the ratio of the real and imaginary parts of the photoelastic constant of the material. Finally, we reveal a Fourier transform-based algorithm that can be used to extract acoustic strain profiles from transient reflectivity measurements.
Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
FG02-00ER15087
OSTI ID:
1557652
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 17 Vol. 103; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Towards the nonlinear acousto-magneto-plasmonics journal August 2016
Higher-order acoustic phonon oscillations in Au nanoparticles controlled by a sequence of ultrashort strain pulses generated by superdiffusive hot electrons journal January 2020
Ultrafast optical detection of coherent acoustic phonons emission driven by superdiffusive hot electrons journal January 2014
Femtosecond imaging of nonlinear acoustics in gold journal January 2014

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