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Advances in OptoElectronics
Volume 2009 (2009), Article ID 967613, 5 pages
http://dx.doi.org/10.1155/2009/967613
Research Article

Forward and Backward Detectable Gray-Scale Data Storage System in Polymeric Material

Institut de Physique et Chimie des Matériaux de Strasbourg, UMR CNRS, ULP 7504, 23 rue du Loess, B.P. 43, 67034 Strasbourg Cedex 2, France

Received 19 February 2009; Accepted 10 August 2009

Academic Editor: Lucimara Roman

Copyright © 2009 E. Sungur et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We describe a fast way to encode a gray-scale image with quadratic properties in polymer thin film doped with azo dye. Under a two photon microscopy setup, we induced disorientation in corona-poled azo dye copolymer thin films by a focused near infrared (IR) femtosecond laser beam of variable exposure time. In situ, the sample was then scan to detect the second harmonic signal. We have also tested the backward detection which can provide reading and writing through a single microscope objective. In addition, we were able to store binary 3D information in the bulk of a 50  m thick film of the same material.