利用偶氮聚合物制作轴对称相位延迟片

Fabrication of Axially-Symmetric Phase Retardation Plate by Use of Azobenzene-Containing Copolymer

在交联的偶氮聚合物材料薄膜上制作了轴对称相位延迟片。基于偶氮聚合物的光致异构特性,搭建了偏振光诱导装置。将偶氮薄膜材料放在可旋转的平台上,激发光照射在旋转台的半径方向从而在薄膜内部诱导形成轴对称分布的偶氮分子阵列。利用探测光实时检测偶氮薄膜在激发光的作用下的相位延迟量。通过编写软件,在计算机上记录下制作过程中探测光通过放置于正交偏振片组中的偶氮薄膜的光强曲线。制作完成后,通过搭建的轴对称延迟片主轴测量光路,对延迟片的轴对称性进行了测量,并用CCD记录下了测量图案。实验测得薄膜材料的双折射达到0.0205,厚度为3μm,相位延迟为65°。

Cross-linked azobenzene containing copolymer is synthesized and utilized to fabricate axially-symmetric phase retardation plate.Based on the photo-isomerization characteristics of azobenzene copolymer,a linearly polarized light inducing device is set up.Placed on a rotating stage,an azobenzene film is irradiated by a linearly polarized light to form molecule alignment with axially-symmetric distribution.The probe beam is used to detect in real time the phase retardation of the film under the effect of linearly polarized light.During the investigation,a particular software on the computer is used to record the intensity curve of the probe light which goes through the film placed in the group of orthogonal polarizer plate.After that,a measuring optical circuit is set up to measure the axial symmetry of the phase retardation plate and the measurement patterns are recorded with a CCD.The experimental results show that the induced birefringence is 0.0205,the thickness is 3 μm,and the phase retardation is 65°.