5 November 2002 Role of the polymer viscoelasticity on the orientational processes of chromophores and on the photorefractive performances in low Tg-doped polymers
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Abstract
The dynamics of the photorefractive properties in low glass transition temperature (Tg) doped polymers essentially depend on the photoconductivity of the host and on the orientational dynamics of nonlinear optical chromophores imbedded in the matrix. A high rotational mobility of push-pull chromophores is required to observe the so-called orientational enhancement. The influence of Tg on the photorefractive performances of guest-host polymers has been previously pointed out. However, the effects of the viscoelastic properties of polymers on the orientational processes of chromophores are neglected in most of the studies devoted to the optimization of photorefractive dynamics. In the present work, the orientational dynamics of chromophores are investigated by dielectric spectroscopy and ellipsometric dynamical measurements in various low Tg doped polymers. The experimental results show the role of different physical parameters (temperature, applied electric field magnitude, amount of plasticizer, average molecular weight of polymer) on the rotational mobility of chromophores. These data underline the necessity to take into account the viscoelastic behavior to improve the dynamics of photorefractive polymers.
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Jean-Charles Ribierre, Jean-Charles Ribierre, Loic Mager, Loic Mager, Alain F. Fort, Alain F. Fort, Stephane Mery, Stephane Mery, } "Role of the polymer viscoelasticity on the orientational processes of chromophores and on the photorefractive performances in low Tg-doped polymers", Proc. SPIE 4802, Organic Photorefractive and Photosensitive Materials for Holographic Applications, (5 November 2002); doi: 10.1117/12.452450; https://doi.org/10.1117/12.452450
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