研究了平面型掺偶氮染料(DR1)向列液晶(5CB)薄膜对可见光波段的响应及在二波耦合实验中探测光(633 nm)的衍射效率与记录光(488 nm)偏振的关系, 并进行了相应解释,得到了小角度入射条件下,记录光偏振方向平行于样品摩擦取向方向时的空间变化的介电张量.此结果适用于多数偶氮类染料, 很好地解释了光致顺-反异构引起的折射率变化.
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