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Photothermal poling of nonlinear optical polymer films

: Yilmaz, S.; Bauer, S.; Gerhard-Multhaupt, R.


Applied Physics Letters 64 (1994), No.21, pp.2770-2
ISSN: 0003-6951
ISSN: 1077-3118
Journal Article
Fraunhofer HHI ()
dielectric polarisation; electro-optical effects; nonlinear optics; optical films; optical microscopy; optical polymers; photothermal effects; polymer films; pyroelectricity; photothermal poling; nonlinear optical polymer films; focused laser beam; molecular dipole orientation patterns; electric field; periodic switching; gratings; scanning electro-optical microscopy; pyroelectrical techniques; electro-optical techniques; glassy polymers

Photothermal heating of a nonlinear optical polymer film with a focused laser beam leads to local temperatures above the glass transition so that the molecular dipoles orient in the electric field applied to the electrodes. Periodic switching of the field direction during movement of the sample yields gratings with alternating polarity which were studied with scanning electro-optical microscopy. The width and the depth of the poled stripes were probed with electro-optical and pyroelectrical techniques, respectively. Photothermal poling may be combined with other poling techniques in order to produce various dipole-orientation patterns for device applications.