偶氮苯侧链聚合物液晶薄膜的光致双折射和永久光学性存储研究  

PHOTOINDUCED BIREFRINGENCE AND REVERSIBLE OPTICAL STORAGE IN LIQUID CRYSTALLINE AZOBENZENE SIDE CHAIN POLYMERS

作　　者：王长顺[1] 杨延强[1] 邱勇 魏振乾[1] 费浩生[1] 尹国盛[2] 

机构地区：[1]吉林大学物理系 [2]河南大学物理系

出　　处：《光子学报》1998年第10期906-910,共5页Acta Photonica Sinica

基　　金：国家自然科学基金

摘　　要：研究了一种含偶氮基侧链聚合物液晶薄膜，该液晶薄膜表现出显著的光致双折射（Δｎ～１．１×１０－２）．当关闭写光作用后，光致双折射的大小没有任何衰减，表现出永久光存储特性．光致双折射的擦除可通过将样品加热到接近其清亮点温度，或用一束圆偏振光照射来实现．分析了偶氮侧链聚合物永久性光学存储的物理机制．A liquid crystallite with an azobenzene moiety as photoactive mesogenic unit is invesigated.Measurements of photoinduced birefringence reveal that the polymer possesses large magnitude of photoinduced birefringence(Δn～10 -2 )and the characteristic of long term optical storage.The resulting polarization information can be erased either by heating the sample to a temperature which is much higher than that of the glass transition,or by optical method with a circularly polarized light.The mechanism of long term optical storage is discussed in this letter.

关 键 词：光致双折射 光学存储 偶氮侧链聚合物 薄膜 

分 类 号：O437[机械工程—光学工程] O484.41[理学—光学]