偶氮液晶聚合物薄膜的二维偏振全息记录  

Two-dimensional polarization holographic recordings in azobenzene liquid-crystalline polymer thin films

作　　者：田勇[1] 潘煦[1] 王长顺[1] 张小强[1] 曾艺[1] 

机构地区：[1]上海交通大学物理系,上海200240

出　　处：《物理学报》2009年第10期6979-6984,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10675083)资助的课题~~

摘　　要：利用偏振全息记录的方法在一种含偶氮侧链的液晶聚合物薄膜中写入了二维偏振光栅.实验采用两束正交偏振的532nm线偏光作为写入光,在样品同一点上分别记录了相互垂直的两个一维偏振光栅,继而对所构成的二维偏振光栅的特性进行了研究.实验结果表明:二维光栅的衍射效率比一维光栅低,其偏振特性是两个一维光栅元特性的叠加;二维光栅衍射效率对入射光偏振态的依赖性和光栅的偏振转换性质来源于材料中线双折射和圆双折射的共同作用.Two-dimensional（2D）polarization holographic recordings were accomplished in azobenzene side-chain liquid-crystalline polymer thin films.The 2D polarization grating makes up of two orthogonal 1D polarization gratings,which were written at the same place by two orthogonally linearly polarized 532 nm beams.It is found that the diffraction efficiency of 2D grating is lower than that of 1D grating,and the 2D grating acts as the integration of its componential 1D gratings.Furthermore,we find that the polarization dependency of diffraction efficiency and the polarization conversions arise from the collaboration of linear and circular birefringence.

关 键 词：偏振全息 二维光栅 偶氮液晶聚合物 

分 类 号：O484.41[理学—固体物理]