Molecular migration mechanism for laser induced surface relief grating formation
Molecular migration mechanism for laser induced surface relief grating formation
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DOI：
10.1016/s0379-6779(00)00332-5
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发表时间：
2000-11-01
期刊：
影响因子：
4.4
通讯作者：
Nunzi, JM
中科院分区：
文献类型：
--
作者：
Fiorini, C;Prudhomme, N;Nunzi, JM
最近，原子力显微镜证实了染料聚合物表面浮雕光栅的直接和可逆全息记录。观察到用偏振激光束的干涉图案照射导致大量的质量传输。在典型的实验中，激光的波长被选择为接近发色团的吸收。表面光栅具有负振幅，其可以大到聚合物膜厚度的两倍。这种光驱动的质量传输的起源仍然不清楚。我们在这里提供的实验证据的迁移的发色团从高到低强度区域。这表明，在这种掺杂或接枝的客体-主体体系中，聚合物链的迁移是客体生色团光诱导运动的结果。这与我们最近开发的染料光致平移扩散模型是一致的。(C)2000 Elsevier Science S.A. All rights reserved.
Direct and reversible holographic recording of surface-relief gratings in ate-dye polymers was recently evidenced using atomic force microscopy. Irradiation with an interference pattern of polarized laser beams was observed to lead to substantial mass-transport. In typical experiments, the wavelength of the laser was chosen to he near the absorption of the chromophores. The surface gratings have a negative amplitude which can be as large as twice the polymer film thickness. The origin of such photo-driven mass transport is still unclear. We provide here experimental evidence of a migration of the chromophores from high to low intensity regions. It indicates that, in such doped or grafted guest-host systems, polymer chain migration is a result of the guest chromophores photoinduced movements. This is in good agreement with our recently developed model of ate-dye photoinduced translation diffusion. (C) 2000 Elsevier Science S.A. All rights reserved.