Detection of shorter-than-skin-depth acoustic pulses in a metal film via transient reflectivity
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Author(s)
Klieber, Christoph
Shalagatskyi, V.
Temnov, V. V.
Makarov, D.
Baek, S.-H.
Eom, Chang-Beom
Manke, Kara Jean
Maznev, Alexei
Nelson, Keith Adam
Alternative Title
Measurement of Shorter-Than-Skin-Depth Acoustic Pulses in a Metal Film Via Transient Reflectivity
Date Issued
October 2013
Journal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Citation
Manke, K. J., A. A. Maznev, C. Klieber, V. Shalagatskyi, V. V. Temnov, D. Makarov, S.-H. Baek, C.-B. Eom, and K. A. Nelson. “Measurement of Shorter-Than-Skin-Depth Acoustic Pulses in a Metal Film via Transient Reflectivity.” Appl. Phys. Lett. 103, no. 17 (2013): 173104.
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Author's final manuscript
Abstract
The detection of ultrashort laser-generated acoustic pulses at a metal surface and the reconstruction of the acoustic strain profile are investigated. A 2 ps-long acoustic pulse generated in an SrRuO[subscript 3] 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. We also demonstrate a Fourier transform-based algorithm that can be used to extract acoustic strain profiles from transient reflectivity measurements.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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DOI of Published Version
https://doi.org/10.1063/1.4826210
