Pushing the limits of acoustics at the nanoscale using femtosecond transient interferometry

A. Devos; S. Sadtler; P. A. Mante; A. Le Louarn; P. Emery

doi:10.1063/1.4903875

Pushing the limits of acoustics at the nanoscale using femtosecond transient interferometry

A. Devos, S. Sadtler, P. A. Mante, A. Le Louarn, P. Emery

Research output: Journal article publication › Journal article › Academic research › peer-review

5 Citations (Scopus)

Abstract

Picosecond acoustics is the perfect technique for measuring elastic properties at nanoscale. But there still are some limitations to reach in-plane properties of ultra-thin films related to optical detection of ultra-high frequency surface acoustic waves. Here, we demonstrate that it is possible to push the limits of the technique using an interferometric detection instead of a usual reflectometry scheme. The experimental observations are supported by a simple model which explains from where comes the previous limitations and why it is possible to overcome it using the interferometric setup. Thanks to those results, it is possible to excite and detect very high frequency surface acoustic waves confined in ultra-thin layer using conventional femtosecond laser and optical setup.

Original language	English
Article number	231905
Journal	Applied Physics Letters
Volume	105
Issue number	23
DOIs	https://doi.org/10.1063/1.4903875
Publication status	Published - 1 Jan 2014
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4903875

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AB - Picosecond acoustics is the perfect technique for measuring elastic properties at nanoscale. But there still are some limitations to reach in-plane properties of ultra-thin films related to optical detection of ultra-high frequency surface acoustic waves. Here, we demonstrate that it is possible to push the limits of the technique using an interferometric detection instead of a usual reflectometry scheme. The experimental observations are supported by a simple model which explains from where comes the previous limitations and why it is possible to overcome it using the interferometric setup. Thanks to those results, it is possible to excite and detect very high frequency surface acoustic waves confined in ultra-thin layer using conventional femtosecond laser and optical setup.

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Pushing the limits of acoustics at the nanoscale using femtosecond transient interferometry

Abstract

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