Institute for Optics and Atomic Physics, now at Chemical Department, Technische Universität Berlin, Strasse des 17 Juni 135, Berlin, Germany.
Sci Rep. 2013;3:2552. doi: 10.1038/srep02552.
Studies on the dynamics of holographic pattern formation in photosensitive polymers, gaining deeper insight into the specific material transformations, are essential for improvements in holographic recording as well as in integrated optics. Here we investigate the kinetics of volume hologram formation in an organic cationic ring-opening polymerization system. The time evolution of the grating strength and the grating phase is presented. We found two steps of growth, separated by a depletion of the light diffraction. Capable to explore this growing behavior, a transition-theory of the refractive index contrast is established. Accordingly the growth curves appear to be ruled by the interplay of polymerization and diffusion. Hence the grating formation mechanisms can be qualified as competing effects regarding the contribution to the refractive index change. We investigate the influence of the preparation and exposure procedure on the transition and consider the usability for integrated wave guide functions.
研究光致聚合物中的全息图形成动力学，深入了解特定的材料变化，对于全息记录以及集成光学的改进至关重要。在这里，我们研究了有机阳离子开环聚合体系中体积全息图形成的动力学。给出了光栅强度和相位的时间演化。我们发现了两个生长步骤，中间有一个光衍射的耗尽。能够探索这种生长行为，我们建立了一个折射率对比度的转变理论。因此，生长曲线似乎由聚合和扩散的相互作用所控制。因此，光栅形成机制可以被定性为对折射率变化的贡献的竞争效应。我们研究了制备和曝光过程对转变的影响，并考虑了其在集成波导功能中的可用性。
