https://doi.org/10.1140/epjp/s13360-024-05668-0
Regular Article
Laser sound generation in a thin metal film on a dielectric substrate
P.N. Lebedev Physical Institute of the Russian Academy of Sciences, 53 Leninskiy Prospekt, 119991, Moscow, Russia
Received:
25
February
2024
Accepted:
17
September
2024
Published online:
30
September
2024
Sound generation by a femtosecond laser pulse in a metal film disposed on a dielectric substrate has been studied. The case of a thin film is considered when uniform heating of the film along its thickness takes place. It is shown that only odd harmonics are excited, the frequency of which increases with decreasing film thickness. The change in the reflection coefficient of a thin film due to the excitation of sound is found, and the oscillations of the reflection coefficient are described. Oscillations occur near the equilibrium position, the presence of which is associated with film heating. A decrease in film thickness is accompanied by an increase in the amplitude of reflection coefficient oscillations. The most significant increase in the oscillation amplitude occurs at a film thickness less than the skin layer depth.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
