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A. Alberucci, C. P Jisha and G. Assanto (2015)

Nonlinear negative refraction in reorientational soft matter

We analyze the propagation of self-trapped optical beams close to the Fréedericksz threshold in nematic liquid crystals. Accounting for power-dependent changes in walk-off due to the all-optical response, we demonstrate that light beams can switch from positive to negative refraction according to the excitation.