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.
出处
《光子学报》
EI
CAS
CSCD
1998年第10期906-910,共5页
Acta Photonica Sinica
基金
国家自然科学基金
关键词
光致双折射
光学存储
偶氮侧链聚合物
薄膜
Photoinduced birefringence
Permanent optical storage
Azobenzene side chain liquid crystalline
