  With the application of surface acoustic wave (SAW) of 39.5 MHz to a model
polymer liquid film,polyisobutylene, deposited on the solid substrates, the
liquid film is densified, proved by the decrease of film thickness and the
increase of refractive index, measured by ellipsometry. Rotational motion of
fluorescent probes doped inside the liquid film, measured by
polarization-resolved single molecule fluorescence microscopy, is retarded and
the dynamical heterogeneity is reduced. It is demonstrated that the application
of SAW of high frequency makes the thin polymeric liquid film densified and
more dynamically homogeneous.
