Abstract
We show that the character of the Fr\'eedericksz transition is significantly changed when circular and helicoidal standing electromagnetic fields are used for excitation. Optical control, such as selective enhancement or suppression, of the collective molecular reorientation modes above the transition threshold is achieved. The particular self-modulation of the azimuthal symmetry and angular momentum of the excitation light allow this control. A corresponding theoretical model is proposed and an analytical solution is found, which describes very well the main features observed in the experiment.
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