The influence of nonlocality on solitons in nematic liquid crystals
Zhu Ye-Qing, Long Xue-Wen, Hu Wei, Cao Long-Gui, Yang Ping-Bao, Guo Qi
华南师范大学光子信息技术实验室，广州 510006
Abstract In this paper, we theoretically investigated the influence of nonlocality on (1+2)-dimensional spatial solitons in undoped nematic liquid crystals (NLCs). We confirmed that the nonlinear index coefficient and the general characteristic length of the nonlinear nonlocality for the NLC are dependent on the pretilt angle of the NLC molecules. Then the Schrdinger-type nonlinear equation in strong nonlocality was given and from the equation the analytical expressions of the single soliton and the critical power were respectively obtained. In experiment, we varied the degree of nonlocality by changing the bias voltage and indirectly determined the relation between the critical power and pretilt angle. At last, by comparison of analytical solutions with the numerical simulation and the experimental result, we verified that our expressions are precise.
Key words ：
spatial soliton
nonlinear index coefficient
degree of nonlocality
critical power
Received: 2007-06-28
Published: 2008-04-25
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2008, Vol. 57 
