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Image storage through gray-scale encoding of second harmonic signals in azo-dye copolymers

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5 Author(s)
Gindre, D. ; Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 CNRS, Universite Louis Pasteur Strasbourg, 23 rue du Lœss, BP 43, F-67034 Strasbourg Cedex 2, France ; Ka, Ibrahima ; Boeglin, Alex ; Fort, Alain
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The authors investigated the optical data and image storage in polymeric materials functionalized with azo-dye molecules. Thin films are initially poled to generate a spatially homogeneous second harmonic signal. The information is locally inscribed through the disorientation of the azo chromophores by successive isomerization cycles induced through the two-photon absorption processes. The resulting micron-scale controlled decrease in second harmonic signal can be exploited to perform optical storage. As a demonstration of the proposed method, they store a picture with an 8 bit gray-scale encoding. This image can only be retrieved through second harmonic detection and not by linear optical imaging techniques.

Published in:

Applied Physics Letters  (Volume:90 ,  Issue: 9 )

Date of Publication:

Feb 2007

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