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http://dx.doi.org/10.4313/JKEM.2010.23.6.491

The Relaxation of Nonlinear Optical Properties in a Poled Polymer  

Jung, Chi-Sup (Laser and Optical Information Engineering, Cheongju University)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.23, no.6, 2010 , pp. 491-496 More about this Journal
Abstract
The relaxation behavior of aligned electric dipoles in a mixed polymer of P2ANS with P(VDF-TrFE) is studied with optical second harmonic generation (SHG). In this work, a macroscopic noncentrosymmetry of the spin coated film was achieved by an electrical poling. The relaxation of induced polar order of nonlinear optic(NLO) chromophores after poling leads to an insufficient long-term stability of NLO properties. In this work, we develop a new technique to suppress such kind of dipole relaxation in a poled polymer. We found that the poled dipoles in a NLO polymer were effectively immobilized by the internal electric field created by a thermally annealed ferroelectric polymer. The long-term stability in a mixed system of NLO polymer/ferroelectric polymer was successively accomplished by a series of thermal treatments applied to the mixed polymer system at a temperature of $140^{\circ}C$ for at least 1hour after poling.
Keywords
Dipole relaxation; P(VDF-TrFE); SHG; NLO; Polymer;
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