14 May 2018 Peculiarities of spatial soliton formation in azobenzene liquid crystal
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Abstract
We report the first experimental realization of spatial soliton formation by the Gaussian beam at 632.8 nm in the azobenzene liquid crystal (LC) layer with planar orientation of LC director. By appropriate anti-parallel rubbing of alignment layers on the upper and lower substrates of the cell LC molecules were oriented along the glass substrates nearly perpendicular to the input window of the cell with a small pre-tilt angle of ~2.60 relative to the beam propagation Z direction. The strong self-focusing effect and soliton formation for laser beam with vertical Y-polarization and beam diffraction for horizontal X-polarization have been observed in the absence of an external electric field. The physical model is considered which implies that the interaction of azobenzene molecules with a laser field is much stronger due to a larger coefficient of orientation nonlinearity compared to other LCs, as well as they are not rigidly anchored to the cell boundary. Thus the molecule alignment can be readily varied by a low-power laser field even for a small pre-tilt angle of molecules which leads to the refractive index change and beam self-focusing regime. The numerical integration of the propagation equation for spatial solitons describes the experimental data very well.
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Tigran Dadalyan, Tigran Dadalyan, Varsenik Nersesyan, Varsenik Nersesyan, Anahit Gogyan, Anahit Gogyan, Yuri Malakyan, Yuri Malakyan, Jeroen Beeckman, Jeroen Beeckman, Kristiaan Neyts, Kristiaan Neyts, Rafael Drampyan, Rafael Drampyan, } "Peculiarities of spatial soliton formation in azobenzene liquid crystal", Proc. SPIE 10684, Nonlinear Optics and its Applications 2018, 1068424 (14 May 2018); doi: 10.1117/12.2307202; https://doi.org/10.1117/12.2307202
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