Temperature dependence of the photorefractive property of PMMA-based composite

Temperature dependence of the photorefractive (PR) property of poly(methyl methacrylate) (PMMA)-based polymer composite is presented. The electrooptic and PR properties of PMMA-based polymer composite have been studied in the temperature range of 22-60 degreesC. The effects of electric field on the PR property of the material have been investigated as well. The experimenta l results show that the electrooptic coefficient first increases slightly w ith the enhancing temperature and eventually saturates. This behavior is at tributed to the temperature activated orientational mobility of the second- order nonlinear chromophores. Diffraction efficiency first increases with t he increasing temperature, and then decreases as the temperature is further enhanced; while the diffraction efficiency increases with the increasing h eld strength. (C) 2001 Elsevier Science Ltd. All rights reserved.