Picosecond acoustic measurements of longitudinal wave velocity of submicron polymer films
- 16 September 1996
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 69 (12) , 1692-1694
- https://doi.org/10.1063/1.117030
Abstract
We apply picosecond acoustic techniques to determine the longitudinal wave speed of submicron polymer films in the through-thickness dimension. The time-of-flight of an elastic wave propagating through the polymer film is measured using an optical pump/probe technique. The longitudinal wave speed in poly(methyl methacrylate) films of thickness ranging from 20 to 130 nm has been determined. A pronounced increase in longitudinal wave speed is observed for films of thickness less than 40 nm.Keywords
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