Reorientation dynamics in thin glassy films

Details Reorientation dynamics in thin glassy films Reorientation dynamics in thin glassy films

2004-02-26

arxiv.org/abs/cond-mat/0402656v1

Physics

Condensed Matter

Soft Condensed Matter

10 pages, including 12 figures, RevTeX4

Scientific paper

10.1088/0953-8984/17/19/002

We present a study of orientational relaxation dynamics in thin films of a low-molecular-weight glass-former as a function of temperature and film thickness. The relaxation is probed by second-harmonic generation after release of a poling electric field. From the measured decays of the second-harmonic signal and their fitting with a stretched exponential, we can determine the distribution of relaxation times in the system. As temperature decreases from above the glass transition, we observe that the width of the distribution first increases under confinement, but that deeper in the glassy state, confinement has no effect anymore on the dynamics.

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