Photorefractive polymer advancements show promise for holography, optics and data storage

November 17, 2005

Photoconducting polymers doped with nonlinear optical chromophores have emerged as efficient and inexpensive photorefractive (PR) materials. These materials show promise for applications in dynamic volume holography, image formation, optical processing, reversible data storage, correlation, etc.

Recently, PR polymer composites have gained a great amount of attention due to their large PR effect, structural flexibility, and good processability.

J. L. Maldonado, G. Ramos-Ortíz, O. Barbosa-García, M. A. Meneses-Nava, M. Olmos-López, D. Rodríguez, H. Reyes, B. Muñoz and N. Farfán from Centro de Investigaciones en Óptica and Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (IPN) have published a study in AZojomo*, in which they fabricated PR composites functionalized with a boron derivative nonlinear chromophore.

Their work examined the diffraction efficiency, the optical gain coefficient, the phase shift, and the effect on the chromophore orientation at room temperature as a function of poly(9-vinylcarbazole):9-ethylcarbazole (PVK:ECZ) ratio of PR composites based on the dye 2-(p-chlorophenyl)-(3'-nitrobenzo[d])-(4''-methoxybenzo[h])-1,3-dioxa-6-aza-2-boracyclonon-6-ene.

For the photorefractive performance, two different chromophore concentrations were used, in addition, the ratio of PVK:ECZ was varied to see the effect on the room temperature molecular orientation. Holographic experiments in a tilted four and two wave mixing geometry were performed. Acceptable photorefractive properties were observed for a polymer with a glass transition temperature (Tg) of 77°C. Even at this Tg, the response time was less than one second.
-end-
The article is available to view at http://www.azom.com/Details.asp?ArticleID=3116

*AZojomo publishes high quality articles and papers on all aspects of materials science and related technologies. All the contributions are reviewed by a world class panel of editors who are experts in a wide spectrum of materials science. [See http://www.azom.com/Journal%20Editorial%20Board.asp]

AZojomo is based on the patented OARS (Open Access Rewards System) publishing protocol. The OARS protocol represents a unique development in the field of scientific publishing - the distribution of online scientific journal revenue between the authors, peer reviewers and site operators with no publication charges, just totally free to access high quality, peer reviewed materials science. [See http://www.azom.com/azojomo.asp and http://www.azom.com/oars.asp]

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