Brasselet E
Laboratoire de Photonique Quantique et Moléculaire, Ecole Normale Supérieure de Cachan, 61 Avenue du Président Wilson, 94235 Cachan Cedex, France.
Phys Rev E Stat Nonlin Soft Matter Phys. 2004 Feb;69(2 Pt 1):021712. doi: 10.1103/PhysRevE.69.021712. Epub 2004 Feb 27.
We study optical control of the nonlinear dynamics generated by an ordinary polarized light at a small angle of incidence in a nematic liquid crystal film. Recent experiments have demonstrated the possibility of modifying the molecular reorientation dynamics by the addition of a weak incoherent beam orthogonally polarized to the pump beam. We present a theoretical model for the director dynamics and we demonstrate the possibility to tune the complexity of the dynamics (optical tuning) using the weak beam intensity as a control parameter. The generation of new dynamical regimes, not observed in the single beam geometry, is also predicted. Finally, interpretation of optical tuning effects is discussed on the basis of an effective model.
我们研究了向列相液晶薄膜中普通偏振光在小入射角下产生的非线性动力学的光学控制。最近的实验表明，通过添加与泵浦光束正交偏振的弱非相干光束，可以改变分子重取向动力学。我们提出了一个指向矢动力学的理论模型，并证明了使用弱光束强度作为控制参数来调节动力学复杂性（光学调谐）的可能性。还预测了在单光束几何结构中未观察到的新动力学状态的产生。最后，基于一个有效模型讨论了光学调谐效应的解释。
