PICOSECOND ACOUSTIC MEASUREMENTS OF LONGITUDINAL-WAVE VELOCITY OF SUBMICRON POLYMER-FILMS

Authors
LEE YC BRETZ KC WISE FW SACHSE W
Citation
Yc. Lee et al., PICOSECOND ACOUSTIC MEASUREMENTS OF LONGITUDINAL-WAVE VELOCITY OF SUBMICRON POLYMER-FILMS, Applied physics letters, 69(12), 1996, pp. 1692-1694
Citations number
23
Categorie Soggetti
Physics, Applied
Journal title
Applied physics letters → ACNP
ISSN journal
00036951
Volume
69
Issue
12
Year of publication
1996
Pages
1692 - 1694
Database
ISI
SICI code
0003-6951(1996)69:12<1692:PAMOLV>2.0.ZU;2-S
Abstract
We apply picosecond acoustic techniques to determine the longitudinal wave speed of submicron polymer films in the through-thickness dimensi on. The time-of-flight of an elastic wave propagating through the poly mer film is measured using an optical pump/probe technique. The longit udinal wave speed in poly(methyl methacrylate) films of thickness rang ing from 20 to 130 nm has been determined. A pronounced increase in lo ngitudinal wave speed is observed for films of thickness less than 40 nm. (C) 1996 American Institute of Physics.