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Proceedings Paper

Polymer poling characterization using second harmonic generation (SHG)
Author(s): Gildas Tellier; Dominique Averty; Errol Blart; Christian Boisrobert; Hartmut Gundel; Sylvain Le Tacon; Cyrille Monnereau; Fabrice Odobel; Raynald Seveno
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Paper Abstract

Several polymer molecules have structures which are suitable for the non-linear optic applications. We report on the design and fabrication of a high performance electro-optic modulator made of polymer thin films. The polymer we study contains a chromophore based on Disperse Red One covalently grafted to a host-matrix. The polymer materials are deposited in thin layers on a glass substrate by chemical solution deposition, either by spin-coating or by dip-coating. The thickness of the films is ranging from a hundred nanometers to several micrometers. Initially, the polymer molecules are randomly oriented and the films are isotropic, hence no electro-optic effect can be observed. In order to break the symmetry and align the chromophores, the films are submitted to the so-called corona poling process. As a result, their structure become non-centrosymmetric and the second-order susceptibility is no longer zero. The corona poling method consists of applying a high electric field to the polymer by means of a needle electrode, placed above the polymer film which is posed on a grounded sample support electrode. Thermal regulation of the support electrode allows to control the temperature during the poling of the films. Once the poling process has been established, a chemical cross-linking function is thermally activated in order to fix the orientation of the chromophores in the polymer matrix. The orientation and its stability in time is evaluated with a Second Harmonic Generation measurement set-up using the Makers Fringes configuration. We studied the influence of the poling temperature, the distance between the corona needle electrode and the sample, the high voltage applied, and the duration of the poling process on the efficiency of chromophore orientation in order to optimize the poling procedure. Finally, aging of poled polymer samples has been investigated at elevated temperatures, confirming the stability of the cross-linking process.

Paper Details

Date Published: 20 April 2006
PDF: 8 pages
Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 61922L (20 April 2006); doi: 10.1117/12.661669
Show Author Affiliations
Gildas Tellier, Univ. de Nantes, Nantes Atlantique Universités (France)
Dominique Averty, Univ. de Nantes, Nantes Atlantique Universités (France)
Errol Blart, Univ. de Nantes, Nantes Atlantique Universités, CNRS, LSO (France)
Christian Boisrobert, Univ. de Nantes, Nantes Atlantique Universités (France)
Hartmut Gundel, Univ. de Nantes, Nantes Atlantique Universités (France)
Sylvain Le Tacon, Univ. de Nantes, Nantes Atlantique Universités (France)
Cyrille Monnereau, Univ. de Nantes, Nantes Atlantique Universités, CNRS, LSO (France)
Fabrice Odobel, Univ. de Nantes, Nantes Atlantique Universités, CNRS, LSO (France)
Raynald Seveno, Univ. de Nantes, Nantes Atlantique Universités (France)

Published in SPIE Proceedings Vol. 6192:
Organic Optoelectronics and Photonics II
Paul L. Heremans; Michele Muccini; Eric A. Meulenkamp, Editor(s)

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