Optical-field-induced reorientation of nematic liquid crystal doped with FeTPPCl based on the resonant model
Optical-field-induced reorientation of nematic liquid crystal doped with FeTPPCl based on the resonant model
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DOI：
10.1007/s00339-006-3731-9
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发表时间：
2006-11
期刊：
影响因子：
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通讯作者：
X. Ying;Ming Li;L. Tao;L. Jie;J. Zhou
中科院分区：
文献类型：
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作者：
X. Ying;Ming Li;L. Tao;L. Jie;J. Zhou
研究了掺杂体积分数为1%的FeTPPCl（5，10，15，20-tetraphenylporphineiron（III）chloride）的5CB的光场诱导取向。当用重复频率为82 MHz、脉宽为80 fs的钛宝石激光激发时，共振吸收区的再取向阈值为1 mW/mm 2，而透明区的再取向阈值为115 mW/mm 2。提出了一个客体共振模型来解释这一反常现象：当吸收光激发时，FeTPPCl分子产生强烈的共振吸收，引起很大的介电各向异性，从而增强了掺杂体系的重取向。这种现象对于将液晶用作非线性光学元件是非常有用的。
Optical-field-induced reorientation of 5CB doped with a 1% volume fraction of FeTPPCl (5,10,15,20–tetraphenylporphineiron(III) chloride) were studied. When excited by Ti:sapphire laser with an 82 MHz repetition rate and a 80 fs pulse duration, the reorientation threshold occurred at an intensity level of 1 mW/mm2for the resonant absorption region, in contrast to the 115 mW/mm2value for the transparent region. A guest resonant model is proposed to explain this anomalous phenomenon: when excited by absorbing light, the FeTPPCl molecule produces an intense resonance absorption which induces a very large dielectric anisotropy, and this therefore enhances the reorientation of the doped system. This phenomenon is very useful for using the liquid crystal as a nonlinear optical component.