Elastic modulus and in-plane thermal diffusivity measurements in thin polyimide films using symmetry-selective real-time impulsive stimulated thermal scattering

J. A. Rogers*, Y. Yang, K. A. Nelson

*Corresponding author for this work

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

We describe a technique for extending the utility of the real-time Impulsive Stimulated Thermal Scattering (ISTS) method for thin film characterization. Using weakly absorbed excitation pulses, we show how to selectively drive acoustic waveguide modes that are unobservable when strongly absorbed pulses are used. The ability to excite and monitor these modes is important because it allows for a significant increase in the experimental sensitivity to the film longitudinal velocity. This arrangement also greatly simplifies determination of the in-plane thermal diffusivity. The technique is illustrated through study of unsupported polyimide films with six different thicknesses.

Original languageEnglish (US)
Pages (from-to)523-534
Number of pages12
JournalApplied Physics A Solids and Surfaces
Volume58
Issue number5
DOIs
StatePublished - May 1 1994

Keywords

  • 43.35.Pt
  • 44.90+f
  • 68.60.Bs
  • 68.60.Dv
  • 78.47.+p

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy (miscellaneous)

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