Optical-field-induced reorientation of nematic liquid crystal doped with FeTPPCl based on the resonant model |
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| Authors: | X. Ying M. Li L. Tao L. Jie J.Y. Zhou |
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| Affiliation: | (1) School of Information Engineering, Guangdong University of Technology, Guangzhou, 510006, P.R. China;(2) The State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen (Zhongshan) University, Guangzhou, 510275, P.R. China;(3) College of Chemistry and Life Science, China Three Gorges University, Yichang, Hubei Province, 443002, P.R. China |
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| Abstract: | 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/mm2 for the resonant absorption region, in contrast to the 115 mW/mm2 value 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. PACS 61.30; 64.70.Md |
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