Photorefractive polymer
advancements show promise for holography, optics and data storage
Photorefractive organic polymer system
functionalized with a nonlinear optical chromophore boronate
derivative.
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.
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