Khoo I C, Slussarenko S, Guenther B D, Shih M Y, Chen P, Wood W V
Opt Lett. 1998 Feb 15;23(4):253-5. doi: 10.1364/ol.23.000253.
We have observed extraordinarily large optical nonlinearity in Methyl Red-doped nematic liquid-crystal film. Grating diffraction can be generated with an optical intensity as low as 40 microW/cm(2) , and a refractive-index change coefficient of more than 6 cm(2)/ W is obtained. The effect is attributed to formation of an optically induced dc space-charge field and to the resulting reorientation of the highly birefringent nematic director axis.
我们在甲基红掺杂的向列型液晶薄膜中观察到了异常大的光学非线性。在低至40微瓦/平方厘米的光强下就能产生光栅衍射，并且获得了大于6平方厘米/瓦的折射率变化系数。这种效应归因于光致直流空间电荷场的形成以及由此导致的高双折射向列型指向矢轴的重新取向。
