Infrared-sensitive photorefractive polymer composites and functionalized polymers with high gain and dynamic range

摘要

We have studied the photorefractive properties of three different polymer types. A first class were (2,4,7-trinitro~9-fluorenylidene)malononitrile sensitized poly(N-vinylcarbazole)/N-ethylcarbazole polymer composites doped with dyes of varying polarity. The performance was optimized, and at an applied field of 59 Volt/micrometer, we have observed complete internal diffraction and a gain coefficient of 167 cm~(-1). A photorefractive two-beam coupling novelty filter was constructed with such a polymer. The response of these composites was compared to that of polymethacrylates functionalized with carbazole, an internal plasticizer and different chromophores. The best results were obtained in a third polymer type, where only a bifunctional chromophore was attached to the polymer backbone.