Picosecond acoustic measurements of longitudinal wave velocity of submicron polymer films

Yung Chun Lee, Kathleen C. Bretz, Frank W. Wise, Wolfgang Sachse

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1692-1694
Number of pages3
JournalApplied Physics Letters
Volume69
Issue number12
DOIs
Publication statusPublished - 1996 Sep 16

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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