Permanent polarization gratings in elastomer azo-dye systems: comparison of layered and mixed samples
Permanent polarization gratings in elastomer azo-dye systems: comparison of layered and mixed samples
复制标题
弹性体偶氮染料系统中的永久偏振光栅：分层和混合样品的比较
DOI：
10.1364/josab.19.002531
复制
发表时间：
2002
影响因子：
1.9
通讯作者：
G. Cipparrone
中科院分区：
文献类型：
--
作者：
F. Ciuchi;A. Mazzulla;G. Cipparrone
研究了用两束正交圆偏振的Ar离子激光写入聚合物(弹性体)和偶氮染料薄膜中的永久偏振光栅。所制备的薄膜有两种，即染料和聚合物的混合物和层状结构，即覆盖有染料的聚合物薄膜。在这两个样品中都观察到了具有长时间稳定性的光栅。在不存在浮雕和记录纯偏振全息图的情况下，对于低写入强度，层状样品比混合样品具有更高的衍射效率。对于较高的记录强度，在两种情况下都观察到了浮雕：混合样品的效率远远高于层状样品，这表明层状系统抑制了浮雕的形成。记录结构的稳定性可以归因于聚合物和染料之间的分子相互作用。
An investigation was carried out of permanent polarization gratings recorded in films of polymer (elastomer) and azo dye written by two orthogonally circularly polarized Ar-ion laser beams. The films prepared were of two kinds, namely, a mixture of dye and polymer and a layered structure, i.e., a thin polymer film covered with dye. In both samples gratings with long-time stability were observed. The layered sample had higher diffraction efficiency than the mixed sample for low writing intensities when no reliefs were present and pure polarization holograms were recorded. For higher recording intensities, reliefs were observed in both cases: The mixed sample’s efficiency was much higher than that of the layered sample, suggesting that layered systems inhibit formation of reliefs. The stability of the recorded structures can be attributed to molecular interactions between polymer and dye.