E Cecchetto et al 2005 J. Phys.: Condens. Matter 17 2825 doi:10.1088/0953-8984/17/19/002
E Cecchetto, D Moroni and B Jérôme
Show affiliationsWe 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 means of 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 any longer on the dynamics.
68.55.-a Thin film structure and morphology
Issue 19 (18 May 2005)
Received 3 November 2004, in final form 21 February 2005
Published 29 April 2005
E Cecchetto et al 2005 J. Phys.: Condens. Matter 17 2825
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